diff --git a/src/agentkit/memory/__init__.py b/src/agentkit/memory/__init__.py
index 1d1ec20..e26e031 100644
--- a/src/agentkit/memory/__init__.py
+++ b/src/agentkit/memory/__init__.py
@@ -6,6 +6,7 @@ from agentkit.memory.episodic import EpisodicMemory
 from agentkit.memory.semantic import SemanticMemory
 from agentkit.memory.http_rag import HttpRAGService
 from agentkit.memory.retriever import MemoryRetriever
+from agentkit.memory.multi_source_retriever import MultiSourceRetriever
 from agentkit.memory.query_transformer import (
     QueryTransformerBase,
     LLMQueryTransformer,
@@ -23,6 +24,7 @@ __all__ = [
     "SemanticMemory",
     "HttpRAGService",
     "MemoryRetriever",
+    "MultiSourceRetriever",
     "QueryTransformerBase",
     "LLMQueryTransformer",
     "RuleQueryTransformer",
diff --git a/src/agentkit/memory/adapters/__init__.py b/src/agentkit/memory/adapters/__init__.py
new file mode 100644
index 0000000..d55c42e
--- /dev/null
+++ b/src/agentkit/memory/adapters/__init__.py
@@ -0,0 +1,13 @@
+"""知识库适配器包"""
+
+from agentkit.memory.adapters.base import KBAdapter
+from agentkit.memory.adapters.feishu import FeishuKBAdapter
+from agentkit.memory.adapters.confluence import ConfluenceAdapter
+from agentkit.memory.adapters.generic_http import GenericHTTPAdapter
+
+__all__ = [
+    "KBAdapter",
+    "FeishuKBAdapter",
+    "ConfluenceAdapter",
+    "GenericHTTPAdapter",
+]
diff --git a/src/agentkit/memory/adapters/base.py b/src/agentkit/memory/adapters/base.py
new file mode 100644
index 0000000..eddedec
--- /dev/null
+++ b/src/agentkit/memory/adapters/base.py
@@ -0,0 +1,160 @@
+"""KBAdapter 抽象基类 - 知识库适配器的基础实现
+
+实现 KnowledgeBase 协议，并提供通用扩展方法：
+- search(): query() 的别名
+- get_document(): 按 ID 获取单个文档
+- authenticate(): 认证验证
+"""
+
+from __future__ import annotations
+
+import logging
+from abc import ABC, abstractmethod
+from typing import Any
+
+import httpx
+
+from agentkit.memory.knowledge_base import Document, QueryResult, SourceInfo
+
+logger = logging.getLogger(__name__)
+
+
+class KBAdapter(ABC):
+    """知识库适配器抽象基类
+
+    实现 KnowledgeBase 协议的所有方法，并提供额外便利方法。
+    子类需实现 _make_client() 和具体的 HTTP 调用逻辑。
+    """
+
+    def __init__(
+        self,
+        source_id: str,
+        source_name: str,
+        source_type: str,
+        timeout: int = 30,
+    ):
+        self._source_id = source_id
+        self._source_name = source_name
+        self._source_type = source_type
+        self._timeout = timeout
+        self._client: httpx.AsyncClient | None = None
+        self._authenticated = False
+
+    @property
+    def source_id(self) -> str:
+        return self._source_id
+
+    @property
+    def source_name(self) -> str:
+        return self._source_name
+
+    @property
+    def source_type(self) -> str:
+        return self._source_type
+
+    def _get_client(self) -> httpx.AsyncClient:
+        """获取或创建 HTTP 客户端"""
+        if self._client is None or self._client.is_closed:
+            self._client = self._make_client()
+        return self._client
+
+    @abstractmethod
+    def _make_client(self) -> httpx.AsyncClient:
+        """创建 HTTP 客户端（子类实现，配置 base_url、headers、auth 等）"""
+        ...
+
+    # ------------------------------------------------------------------
+    # KnowledgeBase 协议方法
+    # ------------------------------------------------------------------
+
+    async def ingest(self, documents: list[Document]) -> list[str]:
+        """写入文档到知识库，返回文档 ID 列表
+
+        默认实现：逐个调用 _ingest_one()。
+        子类可覆盖以实现批量写入。
+        """
+        ids: list[str] = []
+        for doc in documents:
+            doc_id = await self._ingest_one(doc)
+            if doc_id:
+                ids.append(doc_id)
+        return ids
+
+    async def _ingest_one(self, document: Document) -> str | None:
+        """写入单个文档（子类可覆盖）"""
+        logger.warning(
+            f"{self.__class__.__name__} does not support ingest; "
+            f"document '{document.doc_id}' skipped"
+        )
+        return None
+
+    async def query(self, text: str, top_k: int = 5) -> list[QueryResult]:
+        """语义检索知识库（委托给 search）"""
+        return await self.search(text, top_k=top_k)
+
+    async def delete_by_id(self, id: str) -> bool:
+        """按文档 ID 删除（子类可覆盖）"""
+        logger.warning(
+            f"{self.__class__.__name__} does not support delete_by_id; "
+            f"id '{id}' skipped"
+        )
+        return False
+
+    async def list_sources(self) -> list[SourceInfo]:
+        """列出可用信息源"""
+        return [
+            SourceInfo(
+                source_id=self._source_id,
+                source_name=self._source_name,
+                source_type=self._source_type,
+            )
+        ]
+
+    @abstractmethod
+    async def health_check(self) -> bool:
+        """检查知识库连接状态（子类实现）"""
+        ...
+
+    # ------------------------------------------------------------------
+    # 扩展方法
+    # ------------------------------------------------------------------
+
+    @abstractmethod
+    async def search(self, query: str, top_k: int = 5) -> list[QueryResult]:
+        """语义检索知识库（子类实现）"""
+        ...
+
+    async def get_document(self, doc_id: str) -> Document | None:
+        """按 ID 获取单个文档（子类可覆盖）"""
+        logger.warning(
+            f"{self.__class__.__name__} does not support get_document; "
+            f"doc_id '{doc_id}' not found"
+        )
+        return None
+
+    async def authenticate(self) -> bool:
+        """认证验证（子类可覆盖）
+
+        默认实现调用 health_check()。
+        """
+        try:
+            self._authenticated = await self.health_check()
+        except Exception:
+            self._authenticated = False
+        return self._authenticated
+
+    # ------------------------------------------------------------------
+    # 生命周期管理
+    # ------------------------------------------------------------------
+
+    async def close(self) -> None:
+        """关闭 HTTP 客户端"""
+        if self._client and not self._client.is_closed:
+            await self._client.aclose()
+            self._client = None
+
+    async def __aenter__(self) -> KBAdapter:
+        return self
+
+    async def __aexit__(self, *args: Any) -> None:
+        await self.close()
diff --git a/src/agentkit/memory/adapters/confluence.py b/src/agentkit/memory/adapters/confluence.py
new file mode 100644
index 0000000..0bed8da
--- /dev/null
+++ b/src/agentkit/memory/adapters/confluence.py
@@ -0,0 +1,210 @@
+"""ConfluenceAdapter - Confluence 知识库适配器
+
+对接 Confluence REST API，实现 KnowledgeBase 协议。
+通过 base_url + username + api_token 认证。
+"""
+
+from __future__ import annotations
+
+import logging
+from typing import Any
+
+import httpx
+
+from agentkit.memory.adapters.base import KBAdapter
+from agentkit.memory.knowledge_base import Document, QueryResult, SourceInfo
+
+logger = logging.getLogger(__name__)
+
+
+class ConfluenceAdapter(KBAdapter):
+    """Confluence 知识库适配器
+
+    对接 Confluence REST API，支持：
+    - CQL 搜索
+    - 获取页面内容
+    - 列出空间
+
+    典型配置::
+
+        adapter = ConfluenceAdapter(
+            base_url="https://your-domain.atlassian.net/wiki",
+            username="user@example.com",
+            api_token="xxx",
+        )
+    """
+
+    def __init__(
+        self,
+        base_url: str,
+        username: str,
+        api_token: str,
+        space_keys: list[str] | None = None,
+        timeout: int = 30,
+    ):
+        super().__init__(
+            source_id=f"confluence-{username.split('@')[0]}",
+            source_name="Confluence",
+            source_type="confluence",
+            timeout=timeout,
+        )
+        self._base_url = base_url.rstrip("/")
+        self._username = username
+        self._api_token = api_token
+        self._space_keys = space_keys or []
+
+    def _make_client(self) -> httpx.AsyncClient:
+        """创建 Confluence API HTTP 客户端"""
+        import base64
+
+        credentials = base64.b64encode(
+            f"{self._username}:{self._api_token}".encode()
+        ).decode()
+        return httpx.AsyncClient(
+            base_url=self._base_url,
+            headers={
+                "Content-Type": "application/json",
+                "Authorization": f"Basic {credentials}",
+            },
+            timeout=self._timeout,
+        )
+
+    async def authenticate(self) -> bool:
+        """Confluence 认证验证"""
+        client = self._get_client()
+        try:
+            resp = await client.get("/rest/api/user/current")
+            self._authenticated = resp.status_code == 200
+            return self._authenticated
+        except Exception as e:
+            logger.error(f"Confluence auth error: {e}")
+            self._authenticated = False
+            return False
+
+    async def search(self, query: str, top_k: int = 5) -> list[QueryResult]:
+        """搜索 Confluence 页面
+
+        使用 CQL (Confluence Query Language) 进行搜索。
+        """
+        client = self._get_client()
+        try:
+            cql = f'text ~ "{query}"'
+            if self._space_keys:
+                space_filter = " OR ".join(
+                    f'space = "{key}"' for key in self._space_keys
+                )
+                cql = f'{cql} AND ({space_filter})'
+
+            resp = await client.get(
+                "/rest/api/content/search",
+                params={"cql": cql, "limit": top_k, "expand": "body.storage"},
+            )
+            resp.raise_for_status()
+            data = resp.json()
+
+            results: list[QueryResult] = []
+            for page in data.get("results", []):
+                body = page.get("body", {}).get("storage", {}).get("value", "")
+                # Strip HTML tags for plain text content
+                import re
+                content = re.sub(r"<[^>]+>", "", body) if body else page.get("title", "")
+
+                results.append(
+                    QueryResult(
+                        content=content[:2000],  # Limit content length
+                        source_id=self._source_id,
+                        source_name=self._source_name,
+                        score=1.0,  # Confluence doesn't return relevance score
+                        metadata={
+                            "space_key": page.get("space", {}).get("key", ""),
+                            "type": page.get("type", ""),
+                            "status": page.get("status", ""),
+                        },
+                        doc_id=page.get("id", ""),
+                        title=page.get("title", ""),
+                    )
+                )
+            return results[:top_k]
+
+        except httpx.HTTPStatusError as e:
+            logger.error(
+                f"Confluence search HTTP error: {e.response.status_code} — "
+                f"{e.response.text[:200]}"
+            )
+            return []
+        except Exception as e:
+            logger.error(f"Confluence search error: {e}")
+            return []
+
+    async def get_document(self, doc_id: str) -> Document | None:
+        """获取 Confluence 页面内容"""
+        client = self._get_client()
+        try:
+            resp = await client.get(
+                f"/rest/api/content/{doc_id}",
+                params={"expand": "body.storage,space"},
+            )
+            resp.raise_for_status()
+            page = resp.json()
+
+            body = page.get("body", {}).get("storage", {}).get("value", "")
+            import re
+            content = re.sub(r"<[^>]+>", "", body) if body else ""
+
+            return Document(
+                doc_id=str(page.get("id", doc_id)),
+                content=content,
+                title=page.get("title", ""),
+                source_id=self._source_id,
+                metadata={
+                    "space_key": page.get("space", {}).get("key", ""),
+                    "type": page.get("type", ""),
+                    "version": page.get("version", {}).get("number", 0),
+                },
+            )
+        except Exception as e:
+            logger.error(f"Confluence get_document error: {e}")
+            return None
+
+    async def list_sources(self) -> list[SourceInfo]:
+        """列出 Confluence 空间"""
+        client = self._get_client()
+        try:
+            resp = await client.get("/rest/api/space", params={"limit": 50})
+            resp.raise_for_status()
+            data = resp.json()
+
+            sources: list[SourceInfo] = []
+            for space in data.get("results", []):
+                sources.append(
+                    SourceInfo(
+                        source_id=f"confluence-space-{space.get('key', '')}",
+                        source_name=space.get("name", ""),
+                        source_type="confluence",
+                    )
+                )
+            return sources if sources else [
+                SourceInfo(
+                    source_id=self._source_id,
+                    source_name=self._source_name,
+                    source_type=self._source_type,
+                )
+            ]
+        except Exception as e:
+            logger.error(f"Confluence list_sources error: {e}")
+            return [
+                SourceInfo(
+                    source_id=self._source_id,
+                    source_name=self._source_name,
+                    source_type=self._source_type,
+                )
+            ]
+
+    async def health_check(self) -> bool:
+        """检查 Confluence API 连接状态"""
+        client = self._get_client()
+        try:
+            resp = await client.get("/rest/api/space", params={"limit": 1})
+            return resp.status_code == 200
+        except Exception:
+            return False
diff --git a/src/agentkit/memory/adapters/feishu.py b/src/agentkit/memory/adapters/feishu.py
new file mode 100644
index 0000000..6672618
--- /dev/null
+++ b/src/agentkit/memory/adapters/feishu.py
@@ -0,0 +1,249 @@
+"""FeishuKBAdapter - 飞书知识库适配器
+
+对接飞书知识库 API，实现 KnowledgeBase 协议。
+通过 app_id + app_secret 认证，调用飞书开放平台 API 检索知识库内容。
+"""
+
+from __future__ import annotations
+
+import logging
+from typing import Any
+
+import httpx
+
+from agentkit.memory.adapters.base import KBAdapter
+from agentkit.memory.knowledge_base import Document, QueryResult, SourceInfo
+
+logger = logging.getLogger(__name__)
+
+
+class FeishuKBAdapter(KBAdapter):
+    """飞书知识库适配器
+
+    对接飞书开放平台知识库 API，支持：
+    - 搜索知识库节点
+    - 获取知识空间列表
+    - 获取文档内容
+
+    典型配置::
+
+        adapter = FeishuKBAdapter(
+            app_id="cli_xxx",
+            app_secret="xxx",
+            base_url="https://open.feishu.cn/open-apis",
+        )
+    """
+
+    def __init__(
+        self,
+        app_id: str,
+        app_secret: str,
+        base_url: str = "https://open.feishu.cn/open-apis",
+        space_ids: list[str] | None = None,
+        timeout: int = 30,
+    ):
+        super().__init__(
+            source_id=f"feishu-{app_id[:8]}",
+            source_name="飞书知识库",
+            source_type="feishu",
+            timeout=timeout,
+        )
+        self._app_id = app_id
+        self._app_secret = app_secret
+        self._base_url = base_url.rstrip("/")
+        self._space_ids = space_ids or []
+        self._access_token: str | None = None
+
+    def _make_client(self) -> httpx.AsyncClient:
+        """创建飞书 API HTTP 客户端"""
+        headers: dict[str, str] = {"Content-Type": "application/json"}
+        if self._access_token:
+            headers["Authorization"] = f"Bearer {self._access_token}"
+        return httpx.AsyncClient(
+            base_url=self._base_url,
+            headers=headers,
+            timeout=self._timeout,
+        )
+
+    async def _get_access_token(self) -> str | None:
+        """获取飞书 tenant_access_token"""
+        if self._access_token:
+            return self._access_token
+
+        client = self._get_client()
+        try:
+            resp = await client.post(
+                "/auth/v3/tenant_access_token/internal",
+                json={
+                    "app_id": self._app_id,
+                    "app_secret": self._app_secret,
+                },
+            )
+            resp.raise_for_status()
+            data = resp.json()
+            if data.get("code") == 0:
+                self._access_token = data.get("tenant_access_token")
+                # 重建客户端以携带 token
+                await self.close()
+                return self._access_token
+            else:
+                logger.error(
+                    f"Feishu auth failed: code={data.get('code')}, "
+                    f"msg={data.get('msg')}"
+                )
+                return None
+        except Exception as e:
+            logger.error(f"Feishu auth error: {e}")
+            return None
+
+    async def authenticate(self) -> bool:
+        """飞书认证"""
+        token = await self._get_access_token()
+        self._authenticated = token is not None
+        return self._authenticated
+
+    async def search(self, query: str, top_k: int = 5) -> list[QueryResult]:
+        """搜索飞书知识库
+
+        调用飞书搜索 API 检索知识库节点内容。
+        """
+        token = await self._get_access_token()
+        if not token:
+            logger.error("FeishuKBAdapter.search: not authenticated")
+            return []
+
+        client = self._get_client()
+        try:
+            payload: dict[str, Any] = {
+                "search_key": query,
+                "page_size": top_k,
+            }
+            if self._space_ids:
+                payload["wiki_space_ids"] = self._space_ids
+
+            resp = await client.post(
+                "/search/v2/wiki",
+                json=payload,
+            )
+            resp.raise_for_status()
+            data = resp.json()
+
+            if data.get("code") != 0:
+                logger.error(
+                    f"Feishu search failed: code={data.get('code')}, "
+                    f"msg={data.get('msg')}"
+                )
+                return []
+
+            results: list[QueryResult] = []
+            for item in data.get("data", {}).get("items", []):
+                results.append(
+                    QueryResult(
+                        content=item.get("content", ""),
+                        source_id=self._source_id,
+                        source_name=self._source_name,
+                        score=float(item.get("score", 0.0)),
+                        metadata={
+                            "wiki_token": item.get("wiki_token", ""),
+                            "space_id": item.get("space_id", ""),
+                        },
+                        doc_id=item.get("wiki_token", ""),
+                        title=item.get("title", ""),
+                    )
+                )
+            return results[:top_k]
+
+        except httpx.HTTPStatusError as e:
+            logger.error(
+                f"Feishu search HTTP error: {e.response.status_code} — "
+                f"{e.response.text[:200]}"
+            )
+            return []
+        except Exception as e:
+            logger.error(f"Feishu search error: {e}")
+            return []
+
+    async def get_document(self, doc_id: str) -> Document | None:
+        """获取飞书知识库文档内容"""
+        token = await self._get_access_token()
+        if not token:
+            return None
+
+        client = self._get_client()
+        try:
+            resp = await client.get(
+                f"/wiki/v2/spaces/get_node",
+                params={"token": doc_id},
+            )
+            resp.raise_for_status()
+            data = resp.json()
+
+            if data.get("code") != 0:
+                return None
+
+            node = data.get("data", {}).get("node", {})
+            return Document(
+                doc_id=doc_id,
+                content=node.get("content", ""),
+                title=node.get("title", ""),
+                source_id=self._source_id,
+                metadata={
+                    "space_id": node.get("space_id", ""),
+                    "obj_type": node.get("obj_type", ""),
+                },
+            )
+        except Exception as e:
+            logger.error(f"Feishu get_document error: {e}")
+            return None
+
+    async def list_sources(self) -> list[SourceInfo]:
+        """列出飞书知识空间"""
+        token = await self._get_access_token()
+        if not token:
+            return [
+                SourceInfo(
+                    source_id=self._source_id,
+                    source_name=self._source_name,
+                    source_type=self._source_type,
+                )
+            ]
+
+        client = self._get_client()
+        try:
+            resp = await client.get("/wiki/v2/spaces", params={"page_size": 50})
+            resp.raise_for_status()
+            data = resp.json()
+
+            sources: list[SourceInfo] = []
+            for space in data.get("data", {}).get("items", []):
+                sources.append(
+                    SourceInfo(
+                        source_id=f"feishu-space-{space.get('space_id', '')}",
+                        source_name=space.get("name", ""),
+                        source_type="feishu",
+                    )
+                )
+            return sources if sources else [
+                SourceInfo(
+                    source_id=self._source_id,
+                    source_name=self._source_name,
+                    source_type=self._source_type,
+                )
+            ]
+        except Exception as e:
+            logger.error(f"Feishu list_sources error: {e}")
+            return [
+                SourceInfo(
+                    source_id=self._source_id,
+                    source_name=self._source_name,
+                    source_type=self._source_type,
+                )
+            ]
+
+    async def health_check(self) -> bool:
+        """检查飞书 API 连接状态"""
+        try:
+            token = await self._get_access_token()
+            return token is not None
+        except Exception:
+            return False
diff --git a/src/agentkit/memory/adapters/generic_http.py b/src/agentkit/memory/adapters/generic_http.py
new file mode 100644
index 0000000..7de5826
--- /dev/null
+++ b/src/agentkit/memory/adapters/generic_http.py
@@ -0,0 +1,289 @@
+"""GenericHTTPAdapter - 通用 HTTP 知识库适配器
+
+配置 API endpoint + auth 即可对接任意 HTTP 知识库服务。
+实现 KnowledgeBase 协议，提供统一的检索接口。
+"""
+
+from __future__ import annotations
+
+import logging
+from typing import Any
+
+import httpx
+
+from agentkit.memory.adapters.base import KBAdapter
+from agentkit.memory.knowledge_base import Document, QueryResult, SourceInfo
+
+logger = logging.getLogger(__name__)
+
+
+class GenericHTTPAdapter(KBAdapter):
+    """通用 HTTP 知识库适配器
+
+    通过配置 API endpoint 和认证信息，对接任意提供 HTTP API 的知识库服务。
+
+    期望的 API 接口：
+    - POST {endpoint_url}/search  → 语义检索
+    - POST {endpoint_url}/ingest  → 文档写入（可选）
+    - GET  {endpoint_url}/sources → 列出信息源（可选）
+    - GET  {endpoint_url}/health  → 健康检查（可选）
+
+    典型配置::
+
+        adapter = GenericHTTPAdapter(
+            endpoint_url="http://localhost:8000/api/knowledge",
+            auth_config={"type": "bearer", "token": "sk-xxx"},
+            headers={"X-Custom-Header": "value"},
+        )
+    """
+
+    def __init__(
+        self,
+        endpoint_url: str,
+        auth_config: dict[str, str] | None = None,
+        headers: dict[str, str] | None = None,
+        source_id: str | None = None,
+        source_name: str = "HTTP Knowledge Base",
+        timeout: int = 30,
+    ):
+        super().__init__(
+            source_id=source_id or f"http-{endpoint_url.rstrip('/').split('/')[-1]}",
+            source_name=source_name,
+            source_type="generic_http",
+            timeout=timeout,
+        )
+        self._endpoint_url = endpoint_url.rstrip("/")
+        self._auth_config = auth_config or {}
+        self._extra_headers = headers or {}
+
+    def _make_client(self) -> httpx.AsyncClient:
+        """创建通用 HTTP 客户端"""
+        headers: dict[str, str] = {
+            "Content-Type": "application/json",
+            **self._extra_headers,
+        }
+
+        # 配置认证
+        auth_type = self._auth_config.get("type", "")
+        if auth_type == "bearer":
+            token = self._auth_config.get("token", "")
+            if token:
+                headers["Authorization"] = f"Bearer {token}"
+        elif auth_type == "basic":
+            import base64
+            username = self._auth_config.get("username", "")
+            password = self._auth_config.get("password", "")
+            if username and password:
+                credentials = base64.b64encode(
+                    f"{username}:{password}".encode()
+                ).decode()
+                headers["Authorization"] = f"Basic {credentials}"
+        elif auth_type == "api_key":
+            key_name = self._auth_config.get("header_name", "X-API-Key")
+            key_value = self._auth_config.get("api_key", "")
+            if key_value:
+                headers[key_name] = key_value
+
+        return httpx.AsyncClient(
+            base_url=self._endpoint_url,
+            headers=headers,
+            timeout=self._timeout,
+        )
+
+    async def search(self, query: str, top_k: int = 5) -> list[QueryResult]:
+        """搜索 HTTP 知识库
+
+        POST {endpoint_url}/search
+        Body: {"query": ..., "top_k": ...}
+        """
+        client = self._get_client()
+        try:
+            payload = {"query": query, "top_k": top_k}
+            resp = await client.post("/search", json=payload)
+            resp.raise_for_status()
+            data = resp.json()
+
+            # 兼容两种响应格式：
+            # 1. {"results": [...]}
+            # 2. [...]
+            if isinstance(data, dict) and "results" in data:
+                items = data["results"]
+            elif isinstance(data, list):
+                items = data
+            else:
+                logger.warning(f"Unexpected search response format: {type(data)}")
+                return []
+
+            results: list[QueryResult] = []
+            for item in items:
+                if isinstance(item, dict):
+                    results.append(
+                        QueryResult(
+                            content=item.get("content", ""),
+                            source_id=self._source_id,
+                            source_name=self._source_name,
+                            score=float(item.get("score", 0.0)),
+                            metadata=item.get("metadata", {}),
+                            doc_id=item.get("doc_id", item.get("id", "")),
+                            title=item.get("title", ""),
+                        )
+                    )
+            return results[:top_k]
+
+        except httpx.HTTPStatusError as e:
+            logger.error(
+                f"GenericHTTP search HTTP error: {e.response.status_code} — "
+                f"{e.response.text[:200]}"
+            )
+            return []
+        except Exception as e:
+            logger.error(f"GenericHTTP search error: {e}")
+            return []
+
+    async def ingest(self, documents: list[Document]) -> list[str]:
+        """写入文档到 HTTP 知识库
+
+        POST {endpoint_url}/ingest
+        Body: {"documents": [...]}
+        """
+        client = self._get_client()
+        try:
+            payload = {
+                "documents": [
+                    {
+                        "doc_id": doc.doc_id,
+                        "content": doc.content,
+                        "title": doc.title,
+                        "source_id": doc.source_id,
+                        "metadata": doc.metadata,
+                    }
+                    for doc in documents
+                ]
+            }
+            resp = await client.post("/ingest", json=payload)
+            resp.raise_for_status()
+            data = resp.json()
+
+            # 兼容响应格式
+            if isinstance(data, dict) and "ids" in data:
+                return data["ids"]
+            elif isinstance(data, list):
+                return [str(item) for item in data]
+            else:
+                return [doc.doc_id for doc in documents]
+
+        except httpx.HTTPStatusError as e:
+            logger.error(
+                f"GenericHTTP ingest HTTP error: {e.response.status_code} — "
+                f"{e.response.text[:200]}"
+            )
+            return []
+        except Exception as e:
+            logger.error(f"GenericHTTP ingest error: {e}")
+            return []
+
+    async def delete_by_id(self, id: str) -> bool:
+        """按文档 ID 删除
+
+        DELETE {endpoint_url}/documents/{id}
+        """
+        client = self._get_client()
+        try:
+            resp = await client.delete(f"/documents/{id}")
+            if resp.status_code in (200, 204):
+                return True
+            return False
+        except Exception as e:
+            logger.error(f"GenericHTTP delete_by_id error: {e}")
+            return False
+
+    async def get_document(self, doc_id: str) -> Document | None:
+        """获取单个文档
+
+        GET {endpoint_url}/documents/{doc_id}
+        """
+        client = self._get_client()
+        try:
+            resp = await client.get(f"/documents/{doc_id}")
+            resp.raise_for_status()
+            data = resp.json()
+
+            return Document(
+                doc_id=data.get("doc_id", data.get("id", doc_id)),
+                content=data.get("content", ""),
+                title=data.get("title", ""),
+                source_id=data.get("source_id", self._source_id),
+                metadata=data.get("metadata", {}),
+            )
+        except Exception as e:
+            logger.error(f"GenericHTTP get_document error: {e}")
+            return None
+
+    async def list_sources(self) -> list[SourceInfo]:
+        """列出信息源
+
+        GET {endpoint_url}/sources
+        """
+        client = self._get_client()
+        try:
+            resp = await client.get("/sources")
+            resp.raise_for_status()
+            data = resp.json()
+
+            if isinstance(data, list):
+                sources: list[SourceInfo] = []
+                for item in data:
+                    if isinstance(item, dict):
+                        sources.append(
+                            SourceInfo(
+                                source_id=item.get("source_id", ""),
+                                source_name=item.get("source_name", ""),
+                                source_type=item.get("source_type", "generic_http"),
+                                document_count=item.get("document_count", 0),
+                            )
+                        )
+                return sources if sources else [
+                    SourceInfo(
+                        source_id=self._source_id,
+                        source_name=self._source_name,
+                        source_type=self._source_type,
+                    )
+                ]
+        except Exception as e:
+            logger.debug(f"GenericHTTP list_sources error (endpoint may not exist): {e}")
+
+        return [
+            SourceInfo(
+                source_id=self._source_id,
+                source_name=self._source_name,
+                source_type=self._source_type,
+            )
+        ]
+
+    async def health_check(self) -> bool:
+        """检查 HTTP 知识库服务连接状态"""
+        client = self._get_client()
+        try:
+            resp = await client.get("/health")
+            if resp.status_code == 200:
+                return True
+        except Exception:
+            pass
+
+        # Fallback: try the base endpoint
+        try:
+            resp = await client.get("/")
+            return resp.status_code in (200, 401, 403)
+        except Exception:
+            return False
+
+    async def authenticate(self) -> bool:
+        """认证验证
+
+        对于 GenericHTTPAdapter，认证通过 health_check 验证。
+        """
+        try:
+            self._authenticated = await self.health_check()
+        except Exception:
+            self._authenticated = False
+        return self._authenticated
diff --git a/src/agentkit/memory/chunking.py b/src/agentkit/memory/chunking.py
new file mode 100644
index 0000000..ad0dbe4
--- /dev/null
+++ b/src/agentkit/memory/chunking.py
@@ -0,0 +1,330 @@
+"""Chunking - 文档分块策略
+
+提供两种分块策略：
+- TextChunker: 按字符数分块，带重叠
+- StructuralChunker: 按文档结构（标题/段落）分块，适用于 Markdown/HTML
+"""
+
+from __future__ import annotations
+
+import logging
+import re
+import uuid
+from dataclasses import dataclass, field
+from typing import Any
+
+logger = logging.getLogger(__name__)
+
+
+@dataclass
+class Chunk:
+    """文档分块"""
+
+    chunk_id: str
+    content: str
+    metadata: dict[str, Any] = field(default_factory=dict)
+
+    def __post_init__(self) -> None:
+        if "source_doc" not in self.metadata:
+            self.metadata["source_doc"] = ""
+        if "position" not in self.metadata:
+            self.metadata["position"] = 0
+
+    def to_dict(self) -> dict[str, Any]:
+        return {
+            "chunk_id": self.chunk_id,
+            "content": self.content,
+            "metadata": self.metadata,
+        }
+
+
+class TextChunker:
+    """按字符数分块，带重叠
+
+    适用于纯文本文档，按固定字符数切分，相邻块之间有重叠区域。
+    """
+
+    def __init__(
+        self,
+        chunk_size: int = 1000,
+        chunk_overlap: int = 200,
+        separator: str = "\n\n",
+    ):
+        """
+        Args:
+            chunk_size: 每个块的最大字符数
+            chunk_overlap: 相邻块之间的重叠字符数
+            separator: 优先分割符
+        """
+        if chunk_overlap >= chunk_size:
+            raise ValueError(f"chunk_overlap ({chunk_overlap}) must be less than chunk_size ({chunk_size})")
+        self._chunk_size = chunk_size
+        self._chunk_overlap = chunk_overlap
+        self._separator = separator
+
+    def chunk(
+        self,
+        text: str,
+        source_doc_id: str = "",
+        metadata: dict[str, Any] | None = None,
+    ) -> list[Chunk]:
+        """将文本分块
+
+        Args:
+            text: 待分块文本
+            source_doc_id: 源文档 ID
+            metadata: 附加元数据
+
+        Returns:
+            Chunk 列表
+        """
+        if not text.strip():
+            return []
+
+        # 先尝试按分隔符分割
+        segments = self._split_by_separator(text)
+
+        # 合并小段，切分大段
+        chunks_text = self._merge_and_split(segments)
+
+        base_meta = dict(metadata or {})
+        base_meta["source_doc"] = source_doc_id
+        base_meta["chunking_strategy"] = "text"
+
+        chunks = []
+        for i, chunk_text in enumerate(chunks_text):
+            chunk_meta = dict(base_meta)
+            chunk_meta["position"] = i
+            chunk_meta["char_count"] = len(chunk_text)
+            chunks.append(Chunk(
+                chunk_id=str(uuid.uuid4()),
+                content=chunk_text,
+                metadata=chunk_meta,
+            ))
+
+        return chunks
+
+    def _split_by_separator(self, text: str) -> list[str]:
+        """按分隔符分割文本"""
+        segments = text.split(self._separator)
+        # 过滤空段
+        return [s.strip() for s in segments if s.strip()]
+
+    def _merge_and_split(self, segments: list[str]) -> list[str]:
+        """合并小段，切分大段"""
+        result: list[str] = []
+        current: list[str] = []
+        current_len = 0
+
+        for segment in segments:
+            seg_len = len(segment)
+
+            # 如果单个段超过 chunk_size，需要进一步切分
+            if seg_len > self._chunk_size:
+                # 先把当前累积的段输出
+                if current:
+                    result.append(self._separator.join(current))
+                    current = []
+                    current_len = 0
+
+                # 切分大段
+                for sub in self._split_large_segment(segment):
+                    result.append(sub)
+                continue
+
+            # 如果加入当前段会超过 chunk_size，先输出当前累积
+            if current_len + seg_len + len(self._separator) > self._chunk_size and current:
+                result.append(self._separator.join(current))
+                # 保留重叠部分
+                overlap_text = self._separator.join(current)
+                overlap_start = max(0, len(overlap_text) - self._chunk_overlap)
+                overlap_segments = self._get_overlap_segments(
+                    overlap_text[overlap_start:], segments
+                )
+                current = overlap_segments
+                current_len = sum(len(s) for s in current) + len(self._separator) * max(0, len(current) - 1)
+
+            current.append(segment)
+            current_len += seg_len + len(self._separator)
+
+        if current:
+            result.append(self._separator.join(current))
+
+        return result
+
+    def _split_large_segment(self, segment: str) -> list[str]:
+        """切分超大段"""
+        result = []
+        start = 0
+        while start < len(segment):
+            end = start + self._chunk_size
+            # 尝试在句子边界切分
+            if end < len(segment):
+                # 查找最近的句子结束符
+                for sep in ["。", ".", "！", "!", "？", "?", "\n"]:
+                    last_sep = segment.rfind(sep, start + self._chunk_size // 2, end)
+                    if last_sep > start:
+                        end = last_sep + len(sep)
+                        break
+            result.append(segment[start:end].strip())
+            start = end - self._chunk_overlap
+            if start <= 0 and end >= len(segment):
+                break
+            if start < 0:
+                start = 0
+        return [r for r in result if r]
+
+    def _get_overlap_segments(self, overlap_text: str, segments: list[str]) -> list[str]:
+        """从重叠文本中提取完整段"""
+        # 简化实现：将重叠文本作为一个段
+        if overlap_text.strip():
+            return [overlap_text.strip()]
+        return []
+
+
+class StructuralChunker:
+    """按文档结构分块
+
+    适用于 Markdown 和 HTML 等有标题结构的文档。
+    按标题层级分块，每个标题下的内容作为一个块。
+    如果某个块超过 chunk_size，则回退到 TextChunker 继续切分。
+    """
+
+    def __init__(
+        self,
+        chunk_size: int = 1000,
+        chunk_overlap: int = 200,
+        heading_levels: int = 3,
+    ):
+        """
+        Args:
+            chunk_size: 每个块的最大字符数
+            chunk_overlap: 回退 TextChunker 时的重叠字符数
+            heading_levels: 识别的标题层级数（1-6 对应 # 到 ######）
+        """
+        self._chunk_size = chunk_size
+        self._chunk_overlap = chunk_overlap
+        self._heading_levels = min(max(heading_levels, 1), 6)
+        self._text_chunker = TextChunker(
+            chunk_size=chunk_size,
+            chunk_overlap=chunk_overlap,
+        )
+
+    def chunk(
+        self,
+        text: str,
+        source_doc_id: str = "",
+        metadata: dict[str, Any] | None = None,
+    ) -> list[Chunk]:
+        """将文本按结构分块
+
+        Args:
+            text: 待分块文本（Markdown 格式）
+            source_doc_id: 源文档 ID
+            metadata: 附加元数据
+
+        Returns:
+            Chunk 列表
+        """
+        if not text.strip():
+            return []
+
+        sections = self._split_by_headings(text)
+
+        base_meta = dict(metadata or {})
+        base_meta["source_doc"] = source_doc_id
+        base_meta["chunking_strategy"] = "structural"
+
+        chunks = []
+        position = 0
+
+        for section in sections:
+            heading = section["heading"]
+            content = section["content"]
+            level = section["level"]
+
+            if not content.strip():
+                continue
+
+            # 如果内容超过 chunk_size，使用 TextChunker 继续切分
+            if len(content) > self._chunk_size:
+                sub_chunks = self._text_chunker.chunk(
+                    content,
+                    source_doc_id=source_doc_id,
+                    metadata=metadata,
+                )
+                for sub in sub_chunks:
+                    sub.metadata["position"] = position
+                    sub.metadata["heading"] = heading
+                    sub.metadata["heading_level"] = level
+                    sub.metadata["chunking_strategy"] = "structural"
+                    position += 1
+                    chunks.append(sub)
+            else:
+                chunk_meta = dict(base_meta)
+                chunk_meta["position"] = position
+                chunk_meta["heading"] = heading
+                chunk_meta["heading_level"] = level
+                chunk_meta["char_count"] = len(content)
+                chunks.append(Chunk(
+                    chunk_id=str(uuid.uuid4()),
+                    content=content,
+                    metadata=chunk_meta,
+                ))
+                position += 1
+
+        return chunks
+
+    def _split_by_headings(self, text: str) -> list[dict[str, Any]]:
+        """按标题分割 Markdown 文本
+
+        Returns:
+            列表，每项包含 heading, content, level
+        """
+        lines = text.split("\n")
+        sections: list[dict[str, Any]] = []
+        current_heading = ""
+        current_level = 0
+        current_lines: list[str] = []
+
+        heading_pattern = re.compile(r"^(#{1," + str(self._heading_levels) + r"})\s+(.+)$")
+
+        for line in lines:
+            match = heading_pattern.match(line)
+            if match:
+                # 保存当前节
+                if current_lines:
+                    content = "\n".join(current_lines).strip()
+                    if content:
+                        sections.append({
+                            "heading": current_heading,
+                            "content": content,
+                            "level": current_level,
+                        })
+
+                # 开始新节
+                current_heading = match.group(2).strip()
+                current_level = len(match.group(1))
+                current_lines = [line]
+            else:
+                current_lines.append(line)
+
+        # 保存最后一节
+        if current_lines:
+            content = "\n".join(current_lines).strip()
+            if content:
+                sections.append({
+                    "heading": current_heading,
+                    "content": content,
+                    "level": current_level,
+                })
+
+        # 如果没有标题结构，整体作为一个块
+        if not sections:
+            sections.append({
+                "heading": "",
+                "content": text.strip(),
+                "level": 0,
+            })
+
+        return sections
diff --git a/src/agentkit/memory/document_loader.py b/src/agentkit/memory/document_loader.py
new file mode 100644
index 0000000..d098b51
--- /dev/null
+++ b/src/agentkit/memory/document_loader.py
@@ -0,0 +1,330 @@
+"""DocumentLoader - 多格式文档解析器
+
+支持 PDF（PyMuPDF/pdfplumber）、Word（python-docx）、Markdown（mistune）、
+HTML（BeautifulSoup）、纯文本。所有格式依赖均为可选（try/except ImportError）。
+"""
+
+from __future__ import annotations
+
+import logging
+import uuid
+from dataclasses import dataclass, field
+from datetime import datetime, timezone
+from pathlib import Path
+from typing import Any
+
+logger = logging.getLogger(__name__)
+
+
+@dataclass
+class Document:
+    """解析后的文档统一格式"""
+
+    doc_id: str
+    title: str
+    content: str
+    metadata: dict[str, Any] = field(default_factory=dict)
+
+    def __post_init__(self) -> None:
+        if "source" not in self.metadata:
+            self.metadata["source"] = ""
+        if "format" not in self.metadata:
+            self.metadata["format"] = "unknown"
+        if "page_count" not in self.metadata:
+            self.metadata["page_count"] = 0
+        if "created_at" not in self.metadata:
+            self.metadata["created_at"] = datetime.now(timezone.utc).isoformat()
+
+    def to_dict(self) -> dict[str, Any]:
+        return {
+            "doc_id": self.doc_id,
+            "title": self.title,
+            "content": self.content,
+            "metadata": self.metadata,
+        }
+
+
+def _detect_format(filename: str) -> str:
+    """根据文件扩展名检测文档格式"""
+    ext = Path(filename).suffix.lower()
+    format_map = {
+        ".pdf": "pdf",
+        ".docx": "docx",
+        ".doc": "docx",
+        ".md": "markdown",
+        ".markdown": "markdown",
+        ".html": "html",
+        ".htm": "html",
+        ".txt": "text",
+        ".csv": "text",
+        ".json": "text",
+        ".xml": "text",
+    }
+    return format_map.get(ext, "text")
+
+
+class DocumentLoader:
+    """多格式文档解析器
+
+    支持格式：
+    - PDF: PyMuPDF (fitz) → pdfplumber → 纯文本回退
+    - Word: python-docx → 纯文本回退
+    - Markdown: mistune → 纯文本回退
+    - HTML: BeautifulSoup → 纯文本回退
+    - 纯文本: 直接读取
+    """
+
+    def load(self, file_path: str | Path) -> Document:
+        """从文件路径加载文档
+
+        Args:
+            file_path: 文件路径
+
+        Returns:
+            解析后的 Document 对象
+
+        Raises:
+            FileNotFoundError: 文件不存在
+            ValueError: 不支持的格式
+        """
+        path = Path(file_path)
+        if not path.exists():
+            raise FileNotFoundError(f"File not found: {path}")
+
+        content = path.read_bytes()
+        return self.load_bytes(content, path.name)
+
+    def load_bytes(self, content: bytes, filename: str) -> Document:
+        """从字节内容加载文档
+
+        Args:
+            content: 文件字节内容
+            filename: 文件名（用于格式检测和元数据）
+
+        Returns:
+            解析后的 Document 对象
+        """
+        doc_format = _detect_format(filename)
+        doc_id = str(uuid.uuid4())
+
+        parsers = {
+            "pdf": self._parse_pdf,
+            "docx": self._parse_docx,
+            "markdown": self._parse_markdown,
+            "html": self._parse_html,
+            "text": self._parse_text,
+        }
+
+        parser = parsers.get(doc_format)
+        if parser is None:
+            logger.warning(f"Unsupported format '{doc_format}' for {filename}, falling back to text")
+            parser = self._parse_text
+
+        text, extra_meta = parser(content, filename)
+
+        metadata: dict[str, Any] = {
+            "source": filename,
+            "format": doc_format,
+            "created_at": datetime.now(timezone.utc).isoformat(),
+        }
+        metadata.update(extra_meta)
+
+        title = Path(filename).stem
+        if "title" in extra_meta:
+            title = extra_meta["title"]
+
+        return Document(
+            doc_id=doc_id,
+            title=title,
+            content=text,
+            metadata=metadata,
+        )
+
+    def _parse_pdf(self, content: bytes, filename: str) -> tuple[str, dict[str, Any]]:
+        """解析 PDF 文件
+
+        优先使用 PyMuPDF (fitz)，回退到 pdfplumber，最终回退到纯文本。
+        """
+        # 尝试 PyMuPDF
+        try:
+            import fitz  # PyMuPDF
+
+            doc = fitz.open(stream=content, filetype="pdf")
+            pages = []
+            for page in doc:
+                pages.append(page.get_text())
+            text = "\n\n".join(pages)
+            meta = {
+                "page_count": len(doc),
+                "parser": "pymupdf",
+            }
+            # 提取 PDF 元数据中的标题
+            pdf_meta = doc.metadata
+            if pdf_meta and pdf_meta.get("title"):
+                meta["title"] = pdf_meta["title"]
+            doc.close()
+            return text, meta
+        except ImportError:
+            pass
+        except Exception as e:
+            logger.warning(f"PyMuPDF parsing failed for {filename}: {e}")
+
+        # 尝试 pdfplumber
+        try:
+            import pdfplumber
+            import io
+
+            pdf = pdfplumber.open(io.BytesIO(content))
+            pages = []
+            for page in pdf.pages:
+                page_text = page.extract_text()
+                if page_text:
+                    pages.append(page_text)
+            text = "\n\n".join(pages)
+            meta = {
+                "page_count": len(pdf.pages),
+                "parser": "pdfplumber",
+            }
+            pdf.close()
+            return text, meta
+        except ImportError:
+            pass
+        except Exception as e:
+            logger.warning(f"pdfplumber parsing failed for {filename}: {e}")
+
+        # 回退到纯文本
+        logger.warning(f"No PDF parser available for {filename}, falling back to text extraction")
+        return self._parse_text(content, filename)
+
+    def _parse_docx(self, content: bytes, filename: str) -> tuple[str, dict[str, Any]]:
+        """解析 Word 文件
+
+        使用 python-docx，回退到纯文本。
+        """
+        try:
+            from docx import Document as DocxDocument
+            import io
+
+            doc = DocxDocument(io.BytesIO(content))
+            paragraphs = []
+            table_count = 0
+
+            # 提取段落文本
+            for para in doc.paragraphs:
+                if para.text.strip():
+                    paragraphs.append(para.text.strip())
+
+            # 提取表格文本
+            for table in doc.tables:
+                table_count += 1
+                for row in table.rows:
+                    row_text = " | ".join(cell.text.strip() for cell in row.cells)
+                    if row_text.strip(" |"):
+                        paragraphs.append(row_text)
+
+            text = "\n\n".join(paragraphs)
+            meta = {
+                "parser": "python-docx",
+                "table_count": table_count,
+            }
+
+            # 提取文档属性中的标题
+            if doc.core_properties and doc.core_properties.title:
+                meta["title"] = doc.core_properties.title
+
+            return text, meta
+        except ImportError:
+            logger.warning(f"python-docx not available for {filename}, falling back to text")
+            return self._parse_text(content, filename)
+        except Exception as e:
+            logger.warning(f"python-docx parsing failed for {filename}: {e}")
+            return self._parse_text(content, filename)
+
+    def _parse_markdown(self, content: bytes, filename: str) -> tuple[str, dict[str, Any]]:
+        """解析 Markdown 文件
+
+        使用 mistune（如果可用），否则直接读取文本。
+        Markdown 原文保留，因为后续分块需要标题结构。
+        """
+        try:
+            text = content.decode("utf-8")
+        except UnicodeDecodeError:
+            text = content.decode("utf-8", errors="replace")
+
+        # 提取第一个标题作为文档标题
+        title = ""
+        for line in text.split("\n"):
+            line_stripped = line.strip()
+            if line_stripped.startswith("#"):
+                title = line_stripped.lstrip("#").strip()
+                break
+
+        meta: dict[str, Any] = {
+            "parser": "markdown",
+        }
+        if title:
+            meta["title"] = title
+
+        # 尝试用 mistune 提取结构信息（但保留原文用于分块）
+        try:
+            import mistune
+
+            # 统计标题数量
+            heading_count = 0
+            for line in text.split("\n"):
+                if line.strip().startswith("#"):
+                    heading_count += 1
+            meta["heading_count"] = heading_count
+        except ImportError:
+            pass
+
+        return text, meta
+
+    def _parse_html(self, content: bytes, filename: str) -> tuple[str, dict[str, Any]]:
+        """解析 HTML 文件
+
+        使用 BeautifulSoup 提取文本，回退到纯文本。
+        """
+        try:
+            from bs4 import BeautifulSoup
+
+            try:
+                html_text = content.decode("utf-8")
+            except UnicodeDecodeError:
+                html_text = content.decode("utf-8", errors="replace")
+
+            soup = BeautifulSoup(html_text, "html.parser")
+
+            # 移除 script 和 style 标签
+            for tag in soup(["script", "style"]):
+                tag.decompose()
+
+            text = soup.get_text(separator="\n", strip=True)
+
+            # 提取标题
+            title = ""
+            if soup.title and soup.title.string:
+                title = soup.title.string.strip()
+
+            meta: dict[str, Any] = {
+                "parser": "beautifulsoup",
+            }
+            if title:
+                meta["title"] = title
+
+            return text, meta
+        except ImportError:
+            logger.warning(f"BeautifulSoup not available for {filename}, falling back to text")
+            return self._parse_text(content, filename)
+        except Exception as e:
+            logger.warning(f"BeautifulSoup parsing failed for {filename}: {e}")
+            return self._parse_text(content, filename)
+
+    def _parse_text(self, content: bytes, filename: str) -> tuple[str, dict[str, Any]]:
+        """解析纯文本文件"""
+        try:
+            text = content.decode("utf-8")
+        except UnicodeDecodeError:
+            text = content.decode("utf-8", errors="replace")
+
+        return text, {"parser": "text"}
diff --git a/src/agentkit/memory/knowledge_base.py b/src/agentkit/memory/knowledge_base.py
new file mode 100644
index 0000000..84ef46d
--- /dev/null
+++ b/src/agentkit/memory/knowledge_base.py
@@ -0,0 +1,84 @@
+"""KnowledgeBase 协议定义 - 外部知识库统一接口
+
+独立于 Memory 接口，提供语义检索模型的知识库协议。
+Memory 的 retrieve(key)/delete(key) 是精确 key-value 语义，
+而 KnowledgeBase 的 query()/ingest() 更适合知识库的语义检索场景。
+
+参见 KTD-7: KBAdapter 使用独立 KnowledgeBase 协议，不直接实现 Memory 接口。
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from datetime import datetime, timezone
+from typing import Any, Protocol, runtime_checkable
+
+
+@dataclass
+class Document:
+    """知识库文档"""
+
+    doc_id: str
+    content: str
+    title: str = ""
+    source_id: str = ""
+    metadata: dict[str, Any] = field(default_factory=dict)
+    created_at: datetime = field(default_factory=lambda: datetime.now(timezone.utc))
+
+
+@dataclass
+class QueryResult:
+    """知识库检索结果"""
+
+    content: str
+    source_id: str
+    source_name: str
+    score: float
+    metadata: dict[str, Any] = field(default_factory=dict)
+    doc_id: str = ""
+    title: str = ""
+
+
+@dataclass
+class SourceInfo:
+    """知识库信息源描述"""
+
+    source_id: str
+    source_name: str
+    source_type: str  # e.g. "feishu", "confluence", "generic_http"
+    document_count: int = 0
+    last_updated: datetime | None = None
+
+
+@runtime_checkable
+class KnowledgeBase(Protocol):
+    """知识库协议 - 统一的外部知识库接口
+
+    所有知识库适配器（飞书、Confluence、通用 HTTP 等）均实现此协议。
+    与 Memory 接口不同，KnowledgeBase 专注于语义检索模型：
+    - ingest() 批量写入文档
+    - query() 语义检索
+    - delete_by_id() 按文档 ID 删除
+    - list_sources() 列出可用信息源
+    - health_check() 检查连接状态
+    """
+
+    async def ingest(self, documents: list[Document]) -> list[str]:
+        """写入文档到知识库，返回文档 ID 列表"""
+        ...
+
+    async def query(self, text: str, top_k: int = 5) -> list[QueryResult]:
+        """语义检索知识库"""
+        ...
+
+    async def delete_by_id(self, id: str) -> bool:
+        """按文档 ID 删除"""
+        ...
+
+    async def list_sources(self) -> list[SourceInfo]:
+        """列出可用信息源"""
+        ...
+
+    async def health_check(self) -> bool:
+        """检查知识库连接状态"""
+        ...
diff --git a/src/agentkit/memory/local_rag.py b/src/agentkit/memory/local_rag.py
new file mode 100644
index 0000000..6e9e2c5
--- /dev/null
+++ b/src/agentkit/memory/local_rag.py
@@ -0,0 +1,525 @@
+"""LocalRAGService - 本地文档 RAG 服务
+
+实现 KnowledgeBase 协议，支持文档摄取、语义检索、删除和来源追溯。
+提供两种实现：
+- LocalRAGService: 基于 pgvector + PostgreSQL（生产环境）
+- InMemoryLocalRAGService: 基于内存（测试和开发环境）
+"""
+
+from __future__ import annotations
+
+import json
+import logging
+import uuid
+from datetime import datetime, timezone
+from typing import Any
+
+from agentkit.memory.chunking import Chunk, StructuralChunker, TextChunker
+from agentkit.memory.document_loader import Document as LoaderDocument
+from agentkit.memory.embedder import Embedder
+from agentkit.memory.knowledge_base import (
+    Document,
+    KnowledgeBase,
+    QueryResult,
+    SourceInfo,
+)
+
+logger = logging.getLogger(__name__)
+
+
+def _loader_doc_to_kb_doc(loader_doc: LoaderDocument) -> Document:
+    """将 document_loader.Document 转换为 knowledge_base.Document"""
+    return Document(
+        doc_id=loader_doc.doc_id,
+        content=loader_doc.content,
+        title=loader_doc.title,
+        source_id=loader_doc.metadata.get("source", ""),
+        metadata=loader_doc.metadata,
+    )
+
+
+class LocalRAGService:
+    """基于 pgvector 的本地 RAG 服务
+
+    实现 KnowledgeBase 协议，使用 pgvector 存储 + 检索。
+    复用 EpisodicMemory 的 pgvector 基础设施模式。
+
+    摄取 Pipeline：上传 → 解析 → 分块 → 嵌入 → 写入 pgvector
+    """
+
+    def __init__(
+        self,
+        session_factory: Any,
+        embedder: Embedder,
+        chunk_size: int = 1000,
+        chunk_overlap: int = 200,
+        table_name: str = "knowledge_chunks",
+        pgvector_enabled: bool = True,
+    ):
+        """
+        Args:
+            session_factory: 返回 async context manager 的工厂
+            embedder: 嵌入器，用于生成向量
+            chunk_size: 分块大小
+            chunk_overlap: 分块重叠
+            table_name: pgvector 查询使用的表名
+            pgvector_enabled: 是否使用 pgvector 原生检索
+        """
+        self._session_factory = session_factory
+        self._embedder = embedder
+        self._chunk_size = chunk_size
+        self._chunk_overlap = chunk_overlap
+        self._table_name = table_name
+        self._pgvector_enabled = pgvector_enabled
+        self._text_chunker = TextChunker(chunk_size=chunk_size, chunk_overlap=chunk_overlap)
+        self._structural_chunker = StructuralChunker(chunk_size=chunk_size, chunk_overlap=chunk_overlap)
+
+    async def ingest(self, documents: list[Document]) -> list[str]:
+        """摄取文档列表
+
+        Args:
+            documents: knowledge_base.Document 对象列表
+
+        Returns:
+            成功摄取的文档 ID 列表
+        """
+        ingested_ids = []
+
+        for doc in documents:
+            try:
+                chunks = self._chunk_document(doc)
+                await self._store_chunks(doc, chunks)
+                ingested_ids.append(doc.doc_id)
+                logger.info(f"Ingested document '{doc.title}' with {len(chunks)} chunks")
+            except Exception as e:
+                logger.error(f"Failed to ingest document '{doc.title}': {e}")
+
+        return ingested_ids
+
+    async def query(self, text: str, top_k: int = 5) -> list[QueryResult]:
+        """语义检索
+
+        Args:
+            text: 查询文本
+            top_k: 返回结果数量
+
+        Returns:
+            检索结果列表
+        """
+        query_embedding = await self._embedder.embed(text)
+
+        async with self._session_factory() as db:
+            try:
+                if self._pgvector_enabled:
+                    return await self._query_pgvector(db, query_embedding, top_k)
+                return await self._query_client_side(db, query_embedding, top_k)
+            except Exception as e:
+                logger.error(f"Failed to query knowledge base: {e}")
+                return []
+
+    async def delete_by_id(self, id: str) -> bool:
+        """按文档 ID 删除
+
+        Args:
+            id: 文档 ID
+
+        Returns:
+            是否删除成功
+        """
+        async with self._session_factory() as db:
+            try:
+                from sqlalchemy import text as sql_text
+
+                sql = sql_text(
+                    f"DELETE FROM {self._table_name} WHERE source_doc_id = :doc_id"
+                )
+                await db.execute(sql, {"doc_id": id})
+                await db.commit()
+                return True
+            except Exception as e:
+                await db.rollback()
+                logger.error(f"Failed to delete document {id}: {e}")
+                return False
+
+    async def list_sources(self) -> list[SourceInfo]:
+        """列出已摄取的文档
+
+        Returns:
+            文档元信息列表
+        """
+        async with self._session_factory() as db:
+            try:
+                from sqlalchemy import text as sql_text
+
+                sql = sql_text(
+                    f"SELECT source_doc_id, source_title, doc_format, "
+                    f"COUNT(*) as chunk_count, "
+                    f"MIN(created_at) as created_at, "
+                    f"MIN(doc_metadata) as doc_metadata "
+                    f"FROM {self._table_name} "
+                    f"GROUP BY source_doc_id, source_title, doc_format "
+                    f"ORDER BY MIN(created_at) DESC"
+                )
+                result = await db.execute(sql)
+                rows = result.mappings().all()
+
+                sources = []
+                for row in rows:
+                    meta = {}
+                    if row.get("doc_metadata"):
+                        try:
+                            meta = json.loads(row["doc_metadata"])
+                        except (json.JSONDecodeError, TypeError):
+                            pass
+
+                    sources.append(SourceInfo(
+                        source_id=row["source_doc_id"],
+                        source_name=row.get("source_title", ""),
+                        source_type=row.get("doc_format", "local"),
+                        document_count=row.get("chunk_count", 0),
+                        last_updated=row["created_at"] if row.get("created_at") else None,
+                    ))
+                return sources
+            except Exception as e:
+                logger.error(f"Failed to list sources: {e}")
+                return []
+
+    async def health_check(self) -> bool:
+        """检查服务健康状态"""
+        async with self._session_factory() as db:
+            try:
+                from sqlalchemy import text as sql_text
+
+                await db.execute(sql_text(f"SELECT 1 FROM {self._table_name} LIMIT 1"))
+                return True
+            except Exception as e:
+                logger.error(f"Health check failed: {e}")
+                return False
+
+    def _chunk_document(self, doc: Document) -> list[Chunk]:
+        """将文档分块"""
+        doc_format = doc.metadata.get("format", "text")
+
+        # Markdown 和 HTML 使用结构化分块
+        if doc_format in ("markdown", "html"):
+            chunks = self._structural_chunker.chunk(
+                doc.content,
+                source_doc_id=doc.doc_id,
+                metadata=doc.metadata,
+            )
+        else:
+            chunks = self._text_chunker.chunk(
+                doc.content,
+                source_doc_id=doc.doc_id,
+                metadata=doc.metadata,
+            )
+
+        return chunks
+
+    async def _store_chunks(self, doc: Document, chunks: list[Chunk]) -> None:
+        """存储文档块到 pgvector"""
+        async with self._session_factory() as db:
+            try:
+                from sqlalchemy import text as sql_text
+
+                for chunk in chunks:
+                    # 生成嵌入
+                    embedding = await self._embedder.embed(chunk.content)
+
+                    sql = sql_text(
+                        f"INSERT INTO {self._table_name} "
+                        f"(chunk_id, source_doc_id, source_title, doc_format, "
+                        f"content, embedding, chunk_metadata, doc_metadata, created_at) "
+                        f"VALUES (:chunk_id, :doc_id, :title, :format, "
+                        f":content, :embedding, :chunk_meta, :doc_meta, :created_at)"
+                    )
+
+                    await db.execute(sql, {
+                        "chunk_id": chunk.chunk_id,
+                        "doc_id": doc.doc_id,
+                        "title": doc.title,
+                        "format": doc.metadata.get("format", "unknown"),
+                        "content": chunk.content,
+                        "embedding": str(embedding),
+                        "chunk_meta": json.dumps(chunk.metadata, ensure_ascii=False),
+                        "doc_meta": json.dumps(doc.metadata, ensure_ascii=False),
+                        "created_at": datetime.now(timezone.utc),
+                    })
+
+                await db.commit()
+            except Exception as e:
+                await db.rollback()
+                logger.error(f"Failed to store chunks for document '{doc.title}': {e}")
+                raise
+
+    async def _query_pgvector(
+        self,
+        db: Any,
+        query_embedding: list[float],
+        top_k: int,
+    ) -> list[QueryResult]:
+        """使用 pgvector <=> 算符检索"""
+        from sqlalchemy import text as sql_text
+
+        sql = sql_text(
+            f"SELECT chunk_id, source_doc_id, source_title, content, "
+            f"chunk_metadata, embedding <=> :query_vec AS distance "
+            f"FROM {self._table_name} "
+            f"ORDER BY embedding <=> :query_vec "
+            f"LIMIT :lim"
+        )
+
+        result = await db.execute(sql, {
+            "query_vec": str(query_embedding),
+            "lim": top_k,
+        })
+        rows = result.mappings().all()
+
+        results = []
+        for row in rows:
+            # 从 distance 计算 cosine similarity
+            distance = row.get("distance", 0.0)
+            # pgvector <=> 返回 cosine distance = 1 - cosine_similarity
+            cosine = max(0.0, 1.0 - float(distance))
+
+            chunk_meta = {}
+            if row.get("chunk_metadata"):
+                try:
+                    chunk_meta = json.loads(row["chunk_metadata"])
+                except (json.JSONDecodeError, TypeError):
+                    pass
+
+            results.append(QueryResult(
+                content=row["content"],
+                source_id=row["source_doc_id"],
+                source_name=row.get("source_title", ""),
+                score=cosine,
+                metadata=chunk_meta,
+                doc_id=row["source_doc_id"],
+                title=row.get("source_title", ""),
+            ))
+
+        return results
+
+    async def _query_client_side(
+        self,
+        db: Any,
+        query_embedding: list[float],
+        top_k: int,
+    ) -> list[QueryResult]:
+        """客户端 O(N) cosine similarity 检索（回退路径）"""
+        from sqlalchemy import text as sql_text
+
+        sql = sql_text(
+            f"SELECT chunk_id, source_doc_id, source_title, content, "
+            f"chunk_metadata, embedding "
+            f"FROM {self._table_name} "
+            f"LIMIT 500"
+        )
+
+        result = await db.execute(sql)
+        rows = result.mappings().all()
+
+        candidates = []
+        for row in rows:
+            row_embedding = row.get("embedding")
+            if row_embedding is None:
+                continue
+
+            # 解析存储的 embedding
+            try:
+                if isinstance(row_embedding, str):
+                    stored_embedding = json.loads(row_embedding)
+                else:
+                    stored_embedding = list(row_embedding)
+            except (json.JSONDecodeError, TypeError):
+                continue
+
+            cosine = self._compute_cosine_similarity(query_embedding, stored_embedding)
+            if cosine < 0.1:
+                continue
+
+            chunk_meta = {}
+            if row.get("chunk_metadata"):
+                try:
+                    chunk_meta = json.loads(row["chunk_metadata"])
+                except (json.JSONDecodeError, TypeError):
+                    pass
+
+            candidates.append(QueryResult(
+                content=row["content"],
+                source_id=row["source_doc_id"],
+                source_name=row.get("source_title", ""),
+                score=cosine,
+                metadata=chunk_meta,
+                doc_id=row["source_doc_id"],
+                title=row.get("source_title", ""),
+            ))
+
+        candidates.sort(key=lambda x: x.score, reverse=True)
+        return candidates[:top_k]
+
+    @staticmethod
+    def _compute_cosine_similarity(vec_a: list[float], vec_b: list[float]) -> float:
+        """计算两个向量的余弦相似度"""
+        if len(vec_a) != len(vec_b) or not vec_a:
+            return 0.0
+        dot_product = sum(a * b for a, b in zip(vec_a, vec_b))
+        magnitude_a = sum(a**2 for a in vec_a) ** 0.5
+        magnitude_b = sum(b**2 for b in vec_b) ** 0.5
+        if magnitude_a == 0.0 or magnitude_b == 0.0:
+            return 0.0
+        return dot_product / (magnitude_a * magnitude_b)
+
+
+class InMemoryLocalRAGService:
+    """基于内存的本地 RAG 服务
+
+    用于测试和开发环境，无需 pgvector 依赖。
+    实现 KnowledgeBase 协议。
+    """
+
+    def __init__(
+        self,
+        embedder: Embedder,
+        chunk_size: int = 1000,
+        chunk_overlap: int = 200,
+    ):
+        """
+        Args:
+            embedder: 嵌入器
+            chunk_size: 分块大小
+            chunk_overlap: 分块重叠
+        """
+        self._embedder = embedder
+        self._text_chunker = TextChunker(chunk_size=chunk_size, chunk_overlap=chunk_overlap)
+        self._structural_chunker = StructuralChunker(chunk_size=chunk_size, chunk_overlap=chunk_overlap)
+
+        # 内存存储
+        self._chunks: dict[str, dict[str, Any]] = {}  # chunk_id → {content, embedding, metadata}
+        self._documents: dict[str, dict[str, Any]] = {}  # doc_id → {title, format, chunk_ids, metadata, created_at}
+
+    async def ingest(self, documents: list[Document]) -> list[str]:
+        """摄取文档列表
+
+        也支持传入 document_loader.Document，会自动转换为 knowledge_base.Document。
+        """
+        ingested_ids = []
+
+        for doc in documents:
+            # 支持 document_loader.Document 自动转换
+            if isinstance(doc, LoaderDocument):
+                doc = _loader_doc_to_kb_doc(doc)
+
+            try:
+                chunks = self._chunk_document(doc)
+                chunk_ids = []
+
+                for chunk in chunks:
+                    embedding = await self._embedder.embed(chunk.content)
+                    self._chunks[chunk.chunk_id] = {
+                        "content": chunk.content,
+                        "embedding": embedding,
+                        "metadata": chunk.metadata,
+                        "source_doc_id": doc.doc_id,
+                    }
+                    chunk_ids.append(chunk.chunk_id)
+
+                self._documents[doc.doc_id] = {
+                    "title": doc.title,
+                    "source_id": doc.source_id,
+                    "format": doc.metadata.get("format", "unknown"),
+                    "chunk_ids": chunk_ids,
+                    "metadata": doc.metadata,
+                    "created_at": datetime.now(timezone.utc),
+                }
+                ingested_ids.append(doc.doc_id)
+                logger.info(f"Ingested document '{doc.title}' with {len(chunks)} chunks")
+            except Exception as e:
+                logger.error(f"Failed to ingest document '{doc.title}': {e}")
+
+        return ingested_ids
+
+    async def query(self, text: str, top_k: int = 5) -> list[QueryResult]:
+        """语义检索"""
+        query_embedding = await self._embedder.embed(text)
+
+        candidates = []
+        for chunk_id, chunk_data in self._chunks.items():
+            stored_embedding = chunk_data["embedding"]
+            cosine = self._compute_cosine_similarity(query_embedding, stored_embedding)
+            if cosine < 0.1:
+                continue
+
+            source_doc_id = chunk_data["source_doc_id"]
+            doc_info = self._documents.get(source_doc_id, {})
+
+            candidates.append(QueryResult(
+                content=chunk_data["content"],
+                source_id=source_doc_id,
+                source_name=doc_info.get("title", ""),
+                score=cosine,
+                metadata=chunk_data.get("metadata", {}),
+                doc_id=source_doc_id,
+                title=doc_info.get("title", ""),
+            ))
+
+        candidates.sort(key=lambda x: x.score, reverse=True)
+        return candidates[:top_k]
+
+    async def delete_by_id(self, id: str) -> bool:
+        """按文档 ID 删除"""
+        if id not in self._documents:
+            return False
+
+        doc_info = self._documents[id]
+        for chunk_id in doc_info.get("chunk_ids", []):
+            self._chunks.pop(chunk_id, None)
+
+        del self._documents[id]
+        return True
+
+    async def list_sources(self) -> list[SourceInfo]:
+        """列出已摄取的文档"""
+        sources = []
+        for doc_id, doc_info in self._documents.items():
+            sources.append(SourceInfo(
+                source_id=doc_id,
+                source_name=doc_info["title"],
+                source_type=doc_info.get("format", "local"),
+                document_count=len(doc_info.get("chunk_ids", [])),
+                last_updated=doc_info.get("created_at"),
+            ))
+        return sources
+
+    async def health_check(self) -> bool:
+        """检查服务健康状态"""
+        return True
+
+    def _chunk_document(self, doc: Document) -> list[Chunk]:
+        """将文档分块"""
+        doc_format = doc.metadata.get("format", "text")
+
+        if doc_format in ("markdown", "html"):
+            return self._structural_chunker.chunk(
+                doc.content,
+                source_doc_id=doc.doc_id,
+                metadata=doc.metadata,
+            )
+        return self._text_chunker.chunk(
+            doc.content,
+            source_doc_id=doc.doc_id,
+            metadata=doc.metadata,
+        )
+
+    @staticmethod
+    def _compute_cosine_similarity(vec_a: list[float], vec_b: list[float]) -> float:
+        """计算两个向量的余弦相似度"""
+        if len(vec_a) != len(vec_b) or not vec_a:
+            return 0.0
+        dot_product = sum(a * b for a, b in zip(vec_a, vec_b))
+        magnitude_a = sum(a**2 for a in vec_a) ** 0.5
+        magnitude_b = sum(b**2 for b in vec_b) ** 0.5
+        if magnitude_a == 0.0 or magnitude_b == 0.0:
+            return 0.0
+        return dot_product / (magnitude_a * magnitude_b)
diff --git a/src/agentkit/memory/multi_source_retriever.py b/src/agentkit/memory/multi_source_retriever.py
new file mode 100644
index 0000000..6ccf35d
--- /dev/null
+++ b/src/agentkit/memory/multi_source_retriever.py
@@ -0,0 +1,230 @@
+"""MultiSourceRetriever - 多源混合检索器
+
+管理多个 KnowledgeBase 协议实现，支持：
+- 信息源指定：search(query, sources=["feishu", "local:合规文档"])
+- 并行查询多个源，按权重融合排序
+- 来源追溯：每个检索结果附带 source_id + document_title + chunk_location
+- 基于 hash 的去重
+"""
+
+from __future__ import annotations
+
+import asyncio
+import hashlib
+import logging
+from dataclasses import replace
+from typing import Any
+
+from agentkit.memory.knowledge_base import KnowledgeBase, QueryResult, SourceInfo
+
+logger = logging.getLogger(__name__)
+
+
+def _content_hash(content: str) -> str:
+    """计算内容哈希，用于去重"""
+    return hashlib.md5(content.encode("utf-8")).hexdigest()
+
+
+class MultiSourceRetriever:
+    """多源混合检索器
+
+    管理多个 KnowledgeBase 协议实现，支持按名称指定信息源、
+    并行查询、权重融合排序和来源追溯。
+
+    用法::
+
+        retriever = MultiSourceRetriever()
+        retriever.register_source("feishu", feishu_adapter)
+        retriever.register_source("local:合规文档", local_rag)
+
+        # 仅从指定源检索
+        results = await retriever.search("合规要求", sources=["feishu", "local:合规文档"])
+
+        # 从所有可用源检索
+        results = await retriever.search("合规要求")
+
+        # 带权重检索
+        results = await retriever.search("合规要求", weights={"feishu": 1.5, "local:合规文档": 0.8})
+    """
+
+    def __init__(self, sources: dict[str, KnowledgeBase] | None = None):
+        """
+        Args:
+            sources: 初始信息源映射，key 为源名称，value 为 KnowledgeBase 实现
+        """
+        self._sources: dict[str, KnowledgeBase] = {}
+        if sources:
+            for name, kb in sources.items():
+                self._sources[name] = kb
+
+    def register_source(self, name: str, knowledge_base: KnowledgeBase) -> None:
+        """注册信息源
+
+        Args:
+            name: 信息源名称，如 "feishu"、"local:合规文档"
+            knowledge_base: KnowledgeBase 协议实现
+        """
+        self._sources[name] = knowledge_base
+        logger.info(f"Registered knowledge source: {name}")
+
+    def unregister_source(self, name: str) -> bool:
+        """注销信息源
+
+        Args:
+            name: 信息源名称
+
+        Returns:
+            是否成功注销
+        """
+        if name in self._sources:
+            del self._sources[name]
+            logger.info(f"Unregistered knowledge source: {name}")
+            return True
+        return False
+
+    async def search(
+        self,
+        query: str,
+        top_k: int = 5,
+        sources: list[str] | None = None,
+        weights: dict[str, float] | None = None,
+    ) -> list[QueryResult]:
+        """多源检索
+
+        Args:
+            query: 检索查询
+            top_k: 返回最大结果数
+            sources: 指定信息源列表，None 表示查询所有已注册源
+            weights: 信息源权重映射，用于提升/降低特定源的分数
+
+        Returns:
+            融合排序后的检索结果列表，每个结果包含来源追溯信息
+        """
+        # 确定要查询的源
+        target_sources = self._resolve_sources(sources)
+        if not target_sources:
+            logger.warning("No knowledge sources available for search")
+            return []
+
+        # 并行查询所有目标源
+        results = await self._query_sources(query, top_k, target_sources, weights)
+
+        # 去重
+        results = self._deduplicate(results)
+
+        # 按 score 降序排序，截取 top_k
+        results.sort(key=lambda r: r.score, reverse=True)
+        return results[:top_k]
+
+    async def list_all_sources(self) -> dict[str, SourceInfo]:
+        """列出所有已注册信息源
+
+        Returns:
+            源名称到 SourceInfo 的映射
+        """
+        result: dict[str, SourceInfo] = {}
+        for name, kb in self._sources.items():
+            try:
+                source_infos = await kb.list_sources()
+                if source_infos:
+                    result[name] = source_infos[0]
+                else:
+                    # 知识库未返回 source info，构造一个占位
+                    result[name] = SourceInfo(
+                        source_id=name,
+                        source_name=name,
+                        source_type="unknown",
+                    )
+            except Exception as e:
+                logger.error(f"Failed to list sources for '{name}': {e}")
+                result[name] = SourceInfo(
+                    source_id=name,
+                    source_name=name,
+                    source_type="error",
+                )
+        return result
+
+    def get_source_names(self) -> list[str]:
+        """获取所有已注册信息源名称"""
+        return list(self._sources.keys())
+
+    def _resolve_sources(self, sources: list[str] | None) -> dict[str, KnowledgeBase]:
+        """解析目标信息源
+
+        Args:
+            sources: 指定的源名称列表，None 表示所有源
+
+        Returns:
+            源名称到 KnowledgeBase 的映射
+        """
+        if sources is None:
+            return dict(self._sources)
+
+        resolved = {}
+        for name in sources:
+            if name in self._sources:
+                resolved[name] = self._sources[name]
+            else:
+                logger.warning(f"Knowledge source '{name}' not found, skipping")
+        return resolved
+
+    async def _query_sources(
+        self,
+        query: str,
+        top_k: int,
+        target_sources: dict[str, KnowledgeBase],
+        weights: dict[str, float] | None,
+    ) -> list[QueryResult]:
+        """并行查询多个信息源
+
+        Args:
+            query: 查询文本
+            top_k: 每个源返回的最大结果数
+            target_sources: 目标源映射
+            weights: 权重映射
+
+        Returns:
+            所有源的检索结果列表（已应用权重）
+        """
+        async def _query_one(name: str, kb: KnowledgeBase) -> list[QueryResult]:
+            try:
+                results = await kb.query(query, top_k=top_k)
+                # 应用权重
+                weight = (weights or {}).get(name, 1.0)
+                return [
+                    replace(r, score=r.score * weight, source_name=name)
+                    for r in results
+                ]
+            except Exception as e:
+                logger.error(f"Query failed for source '{name}': {e}")
+                return []
+
+        tasks = [_query_one(name, kb) for name, kb in target_sources.items()]
+        all_results = await asyncio.gather(*tasks, return_exceptions=True)
+
+        merged: list[QueryResult] = []
+        for result in all_results:
+            if isinstance(result, Exception):
+                logger.error(f"Source query raised exception: {result}")
+                continue
+            if isinstance(result, list):
+                merged.extend(result)
+
+        return merged
+
+    @staticmethod
+    def _deduplicate(results: list[QueryResult]) -> list[QueryResult]:
+        """基于内容哈希去重，保留分数最高的结果
+
+        Args:
+            results: 待去重的结果列表
+
+        Returns:
+            去重后的结果列表
+        """
+        seen: dict[str, QueryResult] = {}
+        for r in results:
+            content_key = _content_hash(r.content)
+            if content_key not in seen or r.score > seen[content_key].score:
+                seen[content_key] = r
+        return list(seen.values())
diff --git a/src/agentkit/memory/retriever.py b/src/agentkit/memory/retriever.py
index ebbc571..e1b36d2 100644
--- a/src/agentkit/memory/retriever.py
+++ b/src/agentkit/memory/retriever.py
@@ -19,6 +19,8 @@ from agentkit.memory.semantic import SemanticMemory
 from agentkit.memory.query_transformer import QueryTransformerBase
 from agentkit.memory.rag_loop import RAGSelfCorrectionLoop
 from agentkit.memory.relevance_scorer import RelevanceScorer
+from agentkit.memory.knowledge_base import KnowledgeBase, QueryResult
+from agentkit.memory.multi_source_retriever import MultiSourceRetriever
 from agentkit.tools.base import Tool
 
 logger = logging.getLogger(__name__)
@@ -59,6 +61,7 @@ class MemoryRetriever:
         context_template: str = "structured",
         enable_self_correction: bool = False,
         max_correction_retries: int = 3,
+        knowledge_sources: dict[str, KnowledgeBase] | None = None,
     ):
         self._working = working_memory
         self._episodic = episodic_memory
@@ -79,6 +82,7 @@ class MemoryRetriever:
                 query_transformer=query_transformer,
                 max_retries=max_correction_retries,
             )
+        self._multi_source_retriever = MultiSourceRetriever(sources=knowledge_sources)
 
     async def retrieve(
         self,
@@ -87,6 +91,8 @@ class MemoryRetriever:
         token_budget: int = 3000,
         filters: dict[str, Any] | None = None,
         _skip_correction: bool = False,
+        sources: list[str] | None = None,
+        source_weights: dict[str, float] | None = None,
     ) -> list[MemoryItem]:
         """混合检索三层记忆
 
@@ -96,7 +102,15 @@ class MemoryRetriever:
             token_budget: token 预算
             filters: 过滤条件
             _skip_correction: 内部参数，CRAG 循环内部调用时跳过自纠正
+            sources: 指定信息源列表，如 ["feishu", "local:合规文档"]。
+                     传入时仅从指定源检索，不查三层记忆。
+            source_weights: 信息源权重映射，用于多源检索时调整分数
         """
+        # 多源检索路径：指定了 sources 时委托给 MultiSourceRetriever
+        if sources is not None:
+            return await self._retrieve_from_sources(
+                query, top_k, token_budget, sources, source_weights
+            )
         # Self-correction loop (CRAG)
         if (
             self._enable_self_correction
@@ -199,6 +213,63 @@ class MemoryRetriever:
 
         return all_items
 
+    async def _retrieve_from_sources(
+        self,
+        query: str,
+        top_k: int = 5,
+        token_budget: int = 3000,
+        sources: list[str] | None = None,
+        source_weights: dict[str, float] | None = None,
+    ) -> list[MemoryItem]:
+        """从指定信息源检索，将 QueryResult 转换为 MemoryItem
+
+        Args:
+            query: 检索查询
+            top_k: 返回最大结果数
+            token_budget: token 预算
+            sources: 信息源名称列表
+            source_weights: 信息源权重映射
+        """
+        kb_results = await self._multi_source_retriever.search(
+            query, top_k=top_k, sources=sources, weights=source_weights
+        )
+
+        # QueryResult → MemoryItem
+        items = []
+        for r in kb_results:
+            items.append(MemoryItem(
+                key=r.source_id,
+                value=r.content,
+                metadata={
+                    **r.metadata,
+                    "source": "rag",
+                    "source_name": r.source_name,
+                    "doc_id": r.doc_id,
+                    "document_title": r.title,
+                },
+                score=r.score,
+            ))
+
+        # Token 预算管理
+        selected = []
+        total_tokens = 0
+        for item in items:
+            text = str(item.value)
+            estimated_tokens = _estimate_tokens(text)
+            if total_tokens + estimated_tokens > token_budget:
+                continue
+            selected.append(item)
+            total_tokens += estimated_tokens
+            if len(selected) >= top_k:
+                break
+
+        return selected
+
+    @property
+    def multi_source_retriever(self) -> MultiSourceRetriever:
+        """获取多源检索器，用于直接注册/注销信息源"""
+        return self._multi_source_retriever
+
     async def get_context_string(
         self,
         query: str,
diff --git a/tests/unit/memory/__init__.py b/tests/unit/memory/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/unit/memory/test_adapters.py b/tests/unit/memory/test_adapters.py
new file mode 100644
index 0000000..ac7ca6b
--- /dev/null
+++ b/tests/unit/memory/test_adapters.py
@@ -0,0 +1,1237 @@
+"""Tests for KnowledgeBase adapters — 飞书、Confluence、通用 HTTP 适配器"""
+
+import pytest
+from unittest.mock import AsyncMock, MagicMock, patch
+
+from agentkit.memory.knowledge_base import Document, QueryResult, SourceInfo, KnowledgeBase
+from agentkit.memory.adapters.base import KBAdapter
+from agentkit.memory.adapters.feishu import FeishuKBAdapter
+from agentkit.memory.adapters.confluence import ConfluenceAdapter
+from agentkit.memory.adapters.generic_http import GenericHTTPAdapter
+
+
+# ---------------------------------------------------------------------------
+# KnowledgeBase Protocol tests
+# ---------------------------------------------------------------------------
+
+
+class TestKnowledgeBaseProtocol:
+    """KnowledgeBase 协议验证"""
+
+    def test_document_creation(self):
+        doc = Document(doc_id="d1", content="测试内容", title="测试文档")
+        assert doc.doc_id == "d1"
+        assert doc.content == "测试内容"
+        assert doc.title == "测试文档"
+        assert doc.metadata == {}
+
+    def test_query_result_creation(self):
+        result = QueryResult(
+            content="检索结果",
+            source_id="feishu-xxx",
+            source_name="飞书知识库",
+            score=0.92,
+        )
+        assert result.content == "检索结果"
+        assert result.score == 0.92
+        assert result.doc_id == ""
+        assert result.metadata == {}
+
+    def test_source_info_creation(self):
+        info = SourceInfo(
+            source_id="feishu-xxx",
+            source_name="飞书知识库",
+            source_type="feishu",
+            document_count=100,
+        )
+        assert info.source_id == "feishu-xxx"
+        assert info.source_type == "feishu"
+        assert info.document_count == 100
+
+    def test_knowledge_base_protocol_check(self):
+        """验证适配器满足 KnowledgeBase 协议"""
+        adapter = FeishuKBAdapter(
+            app_id="cli_test",
+            app_secret="secret",
+        )
+        assert isinstance(adapter, KnowledgeBase)
+
+        adapter2 = ConfluenceAdapter(
+            base_url="https://test.atlassian.net/wiki",
+            username="user@test.com",
+            api_token="token",
+        )
+        assert isinstance(adapter2, KnowledgeBase)
+
+        adapter3 = GenericHTTPAdapter(
+            endpoint_url="http://localhost:8000/api/kb",
+        )
+        assert isinstance(adapter3, KnowledgeBase)
+
+
+# ---------------------------------------------------------------------------
+# KBAdapter base class tests
+# ---------------------------------------------------------------------------
+
+
+class TestKBAdapterBase:
+    """KBAdapter 抽象基类测试"""
+
+    def _make_concrete_adapter(self) -> KBAdapter:
+        """创建一个具体子类用于测试"""
+
+        class ConcreteAdapter(KBAdapter):
+            def _make_client(self):
+                return MagicMock()
+
+            async def search(self, query, top_k=5):
+                return []
+
+            async def health_check(self):
+                return True
+
+        return ConcreteAdapter(
+            source_id="test-adapter",
+            source_name="Test Adapter",
+            source_type="test",
+        )
+
+    @pytest.mark.asyncio
+    async def test_query_delegates_to_search(self):
+        adapter = self._make_concrete_adapter()
+        adapter.search = AsyncMock(return_value=[
+            QueryResult(content="result", source_id="test", source_name="test", score=0.9)
+        ])
+
+        results = await adapter.query("test query", top_k=3)
+        adapter.search.assert_called_once_with("test query", top_k=3)
+        assert len(results) == 1
+
+    @pytest.mark.asyncio
+    async def test_list_sources_default(self):
+        adapter = self._make_concrete_adapter()
+        sources = await adapter.list_sources()
+        assert len(sources) == 1
+        assert sources[0].source_id == "test-adapter"
+        assert sources[0].source_name == "Test Adapter"
+
+    @pytest.mark.asyncio
+    async def test_ingest_default_returns_empty(self):
+        adapter = self._make_concrete_adapter()
+        docs = [Document(doc_id="d1", content="test")]
+        ids = await adapter.ingest(docs)
+        assert ids == []
+
+    @pytest.mark.asyncio
+    async def test_delete_by_id_default_returns_false(self):
+        adapter = self._make_concrete_adapter()
+        result = await adapter.delete_by_id("d1")
+        assert result is False
+
+    @pytest.mark.asyncio
+    async def test_get_document_default_returns_none(self):
+        adapter = self._make_concrete_adapter()
+        result = await adapter.get_document("d1")
+        assert result is None
+
+    @pytest.mark.asyncio
+    async def test_authenticate_delegates_to_health_check(self):
+        adapter = self._make_concrete_adapter()
+        adapter.health_check = AsyncMock(return_value=True)
+        result = await adapter.authenticate()
+        assert result is True
+        adapter.health_check.assert_called_once()
+
+    @pytest.mark.asyncio
+    async def test_authenticate_failure(self):
+        adapter = self._make_concrete_adapter()
+        adapter.health_check = AsyncMock(side_effect=Exception("connection error"))
+        result = await adapter.authenticate()
+        assert result is False
+
+    @pytest.mark.asyncio
+    async def test_context_manager(self):
+        adapter = self._make_concrete_adapter()
+        adapter.close = AsyncMock()
+        async with adapter as a:
+            assert a is adapter
+        adapter.close.assert_called_once()
+
+
+# ---------------------------------------------------------------------------
+# FeishuKBAdapter tests
+# ---------------------------------------------------------------------------
+
+
+class TestFeishuKBAdapterInit:
+    """FeishuKBAdapter 初始化"""
+
+    def test_basic_init(self):
+        adapter = FeishuKBAdapter(
+            app_id="cli_test1234",
+            app_secret="secret",
+        )
+        assert adapter._app_id == "cli_test1234"
+        assert adapter._app_secret == "secret"
+        assert adapter._base_url == "https://open.feishu.cn/open-apis"
+        assert adapter._space_ids == []
+        assert adapter._source_type == "feishu"
+
+    def test_init_with_custom_base_url(self):
+        adapter = FeishuKBAdapter(
+            app_id="cli_test1234",
+            app_secret="secret",
+            base_url="https://internal.feishu.cn/open-apis/",
+            space_ids=["space-1", "space-2"],
+            timeout=60,
+        )
+        assert adapter._base_url == "https://internal.feishu.cn/open-apis"
+        assert adapter._space_ids == ["space-1", "space-2"]
+        assert adapter._timeout == 60
+
+
+class TestFeishuKBAdapterAuth:
+    """FeishuKBAdapter 认证"""
+
+    @pytest.mark.asyncio
+    async def test_authenticate_success(self):
+        adapter = FeishuKBAdapter(
+            app_id="cli_test",
+            app_secret="secret",
+        )
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.raise_for_status = MagicMock()
+        mock_resp.json.return_value = {
+            "code": 0,
+            "msg": "ok",
+            "tenant_access_token": "t-xxx",
+            "expire": 7200,
+        }
+
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        result = await adapter.authenticate()
+        assert result is True
+        assert adapter._access_token == "t-xxx"
+
+    @pytest.mark.asyncio
+    async def test_authenticate_failure(self):
+        adapter = FeishuKBAdapter(
+            app_id="cli_test",
+            app_secret="wrong_secret",
+        )
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.raise_for_status = MagicMock()
+        mock_resp.json.return_value = {
+            "code": 10014,
+            "msg": "invalid app_id or app_secret",
+        }
+
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        result = await adapter.authenticate()
+        assert result is False
+
+
+class TestFeishuKBAdapterSearch:
+    """FeishuKBAdapter 检索"""
+
+    @pytest.fixture
+    def adapter(self):
+        return FeishuKBAdapter(
+            app_id="cli_test",
+            app_secret="secret",
+            space_ids=["space-1"],
+        )
+
+    @pytest.mark.asyncio
+    async def test_search_success(self, adapter):
+        # Mock authentication
+        adapter._access_token = "t-xxx"
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.raise_for_status = MagicMock()
+        mock_resp.json.return_value = {
+            "code": 0,
+            "data": {
+                "items": [
+                    {
+                        "wiki_token": "wikcnxxx",
+                        "title": "飞书知识库文档",
+                        "content": "这是飞书知识库的内容",
+                        "score": 0.92,
+                        "space_id": "space-1",
+                    },
+                    {
+                        "wiki_token": "wikcnyyy",
+                        "title": "另一个文档",
+                        "content": "另一个文档的内容",
+                        "score": 0.85,
+                        "space_id": "space-1",
+                    },
+                ],
+            },
+        }
+
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        results = await adapter.search("飞书知识库", top_k=5)
+
+        assert len(results) == 2
+        assert results[0].content == "这是飞书知识库的内容"
+        assert results[0].score == 0.92
+        assert results[0].source_id.startswith("feishu-")
+        assert results[0].source_name == "飞书知识库"
+        assert results[0].doc_id == "wikcnxxx"
+        assert results[0].title == "飞书知识库文档"
+
+    @pytest.mark.asyncio
+    async def test_search_not_authenticated(self, adapter):
+        adapter._access_token = None
+        adapter._get_access_token = AsyncMock(return_value=None)
+
+        results = await adapter.search("test")
+        assert results == []
+
+    @pytest.mark.asyncio
+    async def test_search_api_error(self, adapter):
+        adapter._access_token = "t-xxx"
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.raise_for_status = MagicMock()
+        mock_resp.json.return_value = {
+            "code": 9999,
+            "msg": "internal error",
+        }
+
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        results = await adapter.search("test")
+        assert results == []
+
+    @pytest.mark.asyncio
+    async def test_search_http_error(self, adapter):
+        import httpx
+
+        adapter._access_token = "t-xxx"
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 500
+        mock_resp.text = "Internal Server Error"
+        mock_resp.raise_for_status.side_effect = httpx.HTTPStatusError(
+            "500", request=MagicMock(), response=mock_resp
+        )
+
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        results = await adapter.search("test")
+        assert results == []
+
+
+class TestFeishuKBAdapterHealthCheck:
+    """FeishuKBAdapter 健康检查"""
+
+    @pytest.mark.asyncio
+    async def test_health_check_ok(self):
+        adapter = FeishuKBAdapter(app_id="cli_test", app_secret="secret")
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.raise_for_status = MagicMock()
+        mock_resp.json.return_value = {"code": 0, "tenant_access_token": "t-xxx"}
+
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        assert await adapter.health_check() is True
+
+    @pytest.mark.asyncio
+    async def test_health_check_failure(self):
+        adapter = FeishuKBAdapter(app_id="cli_test", app_secret="secret")
+
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(side_effect=Exception("Connection refused"))
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        assert await adapter.health_check() is False
+
+
+class TestFeishuKBAdapterListSources:
+    """FeishuKBAdapter 列出信息源"""
+
+    @pytest.mark.asyncio
+    async def test_list_sources_success(self):
+        adapter = FeishuKBAdapter(app_id="cli_test", app_secret="secret")
+        adapter._access_token = "t-xxx"
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.raise_for_status = MagicMock()
+        mock_resp.json.return_value = {
+            "data": {
+                "items": [
+                    {"space_id": "space-1", "name": "产品文档"},
+                    {"space_id": "space-2", "name": "技术文档"},
+                ]
+            }
+        }
+
+        mock_client = AsyncMock()
+        mock_client.get = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        sources = await adapter.list_sources()
+        assert len(sources) == 2
+        assert sources[0].source_name == "产品文档"
+        assert sources[1].source_name == "技术文档"
+
+    @pytest.mark.asyncio
+    async def test_list_sources_not_authenticated(self):
+        adapter = FeishuKBAdapter(app_id="cli_test", app_secret="secret")
+        adapter._access_token = None
+        adapter._get_access_token = AsyncMock(return_value=None)
+
+        sources = await adapter.list_sources()
+        assert len(sources) == 1
+        assert sources[0].source_id.startswith("feishu-")
+
+
+class TestFeishuKBAdapterGetDocument:
+    """FeishuKBAdapter 获取文档"""
+
+    @pytest.mark.asyncio
+    async def test_get_document_success(self):
+        adapter = FeishuKBAdapter(app_id="cli_test", app_secret="secret")
+        adapter._access_token = "t-xxx"
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.raise_for_status = MagicMock()
+        mock_resp.json.return_value = {
+            "code": 0,
+            "data": {
+                "node": {
+                    "title": "测试文档",
+                    "content": "文档内容",
+                    "space_id": "space-1",
+                    "obj_type": "doc",
+                }
+            },
+        }
+
+        mock_client = AsyncMock()
+        mock_client.get = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        doc = await adapter.get_document("wikcnxxx")
+        assert doc is not None
+        assert doc.doc_id == "wikcnxxx"
+        assert doc.title == "测试文档"
+        assert doc.content == "文档内容"
+
+    @pytest.mark.asyncio
+    async def test_get_document_not_found(self):
+        adapter = FeishuKBAdapter(app_id="cli_test", app_secret="secret")
+        adapter._access_token = "t-xxx"
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.raise_for_status = MagicMock()
+        mock_resp.json.return_value = {"code": 10004, "msg": "node not found"}
+
+        mock_client = AsyncMock()
+        mock_client.get = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        doc = await adapter.get_document("nonexistent")
+        assert doc is None
+
+
+# ---------------------------------------------------------------------------
+# ConfluenceAdapter tests
+# ---------------------------------------------------------------------------
+
+
+class TestConfluenceAdapterInit:
+    """ConfluenceAdapter 初始化"""
+
+    def test_basic_init(self):
+        adapter = ConfluenceAdapter(
+            base_url="https://test.atlassian.net/wiki",
+            username="user@test.com",
+            api_token="token",
+        )
+        assert adapter._base_url == "https://test.atlassian.net/wiki"
+        assert adapter._username == "user@test.com"
+        assert adapter._api_token == "token"
+        assert adapter._space_keys == []
+        assert adapter._source_type == "confluence"
+
+    def test_init_with_spaces(self):
+        adapter = ConfluenceAdapter(
+            base_url="https://test.atlassian.net/wiki/",
+            username="user@test.com",
+            api_token="token",
+            space_keys=["DEV", "DOC"],
+            timeout=60,
+        )
+        assert adapter._base_url == "https://test.atlassian.net/wiki"
+        assert adapter._space_keys == ["DEV", "DOC"]
+
+
+class TestConfluenceAdapterAuth:
+    """ConfluenceAdapter 认证"""
+
+    @pytest.mark.asyncio
+    async def test_authenticate_success(self):
+        adapter = ConfluenceAdapter(
+            base_url="https://test.atlassian.net/wiki",
+            username="user@test.com",
+            api_token="token",
+        )
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+
+        mock_client = AsyncMock()
+        mock_client.get = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        result = await adapter.authenticate()
+        assert result is True
+
+    @pytest.mark.asyncio
+    async def test_authenticate_failure(self):
+        adapter = ConfluenceAdapter(
+            base_url="https://test.atlassian.net/wiki",
+            username="user@test.com",
+            api_token="wrong_token",
+        )
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 401
+
+        mock_client = AsyncMock()
+        mock_client.get = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        result = await adapter.authenticate()
+        assert result is False
+
+
+class TestConfluenceAdapterSearch:
+    """ConfluenceAdapter 检索"""
+
+    @pytest.fixture
+    def adapter(self):
+        return ConfluenceAdapter(
+            base_url="https://test.atlassian.net/wiki",
+            username="user@test.com",
+            api_token="token",
+            space_keys=["DEV"],
+        )
+
+    @pytest.mark.asyncio
+    async def test_search_success(self, adapter):
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.raise_for_status = MagicMock()
+        mock_resp.json.return_value = {
+            "results": [
+                {
+                    "id": "12345",
+                    "title": "Confluence 页面",
+                    "type": "page",
+                    "status": "current",
+                    "space": {"key": "DEV"},
+                    "body": {
+                        "storage": {
+                            "value": "<p>这是 Confluence 页面内容</p>"
+                        }
+                    },
+                },
+            ],
+        }
+
+        mock_client = AsyncMock()
+        mock_client.get = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        results = await adapter.search("Confluence", top_k=5)
+
+        assert len(results) == 1
+        assert "Confluence 页面内容" in results[0].content
+        assert results[0].source_id.startswith("confluence-")
+        assert results[0].source_name == "Confluence"
+        assert results[0].doc_id == "12345"
+        assert results[0].title == "Confluence 页面"
+
+    @pytest.mark.asyncio
+    async def test_search_with_space_filter(self, adapter):
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.raise_for_status = MagicMock()
+        mock_resp.json.return_value = {"results": []}
+
+        mock_client = AsyncMock()
+        mock_client.get = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        await adapter.search("test")
+
+        # Verify CQL includes space filter
+        call_args = mock_client.get.call_args
+        params = call_args[1].get("params", call_args[0][1] if len(call_args[0]) > 1 else {})
+        cql = params.get("cql", "")
+        assert 'space = "DEV"' in cql
+
+    @pytest.mark.asyncio
+    async def test_search_http_error(self, adapter):
+        import httpx
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 500
+        mock_resp.text = "Internal Server Error"
+        mock_resp.raise_for_status.side_effect = httpx.HTTPStatusError(
+            "500", request=MagicMock(), response=mock_resp
+        )
+
+        mock_client = AsyncMock()
+        mock_client.get = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        results = await adapter.search("test")
+        assert results == []
+
+
+class TestConfluenceAdapterHealthCheck:
+    """ConfluenceAdapter 健康检查"""
+
+    @pytest.mark.asyncio
+    async def test_health_check_ok(self):
+        adapter = ConfluenceAdapter(
+            base_url="https://test.atlassian.net/wiki",
+            username="user@test.com",
+            api_token="token",
+        )
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+
+        mock_client = AsyncMock()
+        mock_client.get = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        assert await adapter.health_check() is True
+
+    @pytest.mark.asyncio
+    async def test_health_check_failure(self):
+        adapter = ConfluenceAdapter(
+            base_url="https://test.atlassian.net/wiki",
+            username="user@test.com",
+            api_token="token",
+        )
+
+        mock_client = AsyncMock()
+        mock_client.get = AsyncMock(side_effect=Exception("Connection refused"))
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        assert await adapter.health_check() is False
+
+
+class TestConfluenceAdapterGetDocument:
+    """ConfluenceAdapter 获取文档"""
+
+    @pytest.mark.asyncio
+    async def test_get_document_success(self):
+        adapter = ConfluenceAdapter(
+            base_url="https://test.atlassian.net/wiki",
+            username="user@test.com",
+            api_token="token",
+        )
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.raise_for_status = MagicMock()
+        mock_resp.json.return_value = {
+            "id": "12345",
+            "title": "测试页面",
+            "type": "page",
+            "space": {"key": "DEV"},
+            "body": {
+                "storage": {
+                    "value": "<p>页面内容</p>"
+                }
+            },
+            "version": {"number": 3},
+        }
+
+        mock_client = AsyncMock()
+        mock_client.get = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        doc = await adapter.get_document("12345")
+        assert doc is not None
+        assert doc.doc_id == "12345"
+        assert doc.title == "测试页面"
+        assert "页面内容" in doc.content
+        assert doc.metadata["version"] == 3
+
+
+class TestConfluenceAdapterListSources:
+    """ConfluenceAdapter 列出信息源"""
+
+    @pytest.mark.asyncio
+    async def test_list_sources_success(self):
+        adapter = ConfluenceAdapter(
+            base_url="https://test.atlassian.net/wiki",
+            username="user@test.com",
+            api_token="token",
+        )
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.raise_for_status = MagicMock()
+        mock_resp.json.return_value = {
+            "results": [
+                {"key": "DEV", "name": "Development"},
+                {"key": "DOC", "name": "Documentation"},
+            ]
+        }
+
+        mock_client = AsyncMock()
+        mock_client.get = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        sources = await adapter.list_sources()
+        assert len(sources) == 2
+        assert sources[0].source_name == "Development"
+        assert sources[1].source_name == "Documentation"
+
+
+# ---------------------------------------------------------------------------
+# GenericHTTPAdapter tests
+# ---------------------------------------------------------------------------
+
+
+class TestGenericHTTPAdapterInit:
+    """GenericHTTPAdapter 初始化"""
+
+    def test_basic_init(self):
+        adapter = GenericHTTPAdapter(
+            endpoint_url="http://localhost:8000/api/kb",
+        )
+        assert adapter._endpoint_url == "http://localhost:8000/api/kb"
+        assert adapter._auth_config == {}
+        assert adapter._extra_headers == {}
+        assert adapter._source_type == "generic_http"
+
+    def test_init_with_auth_bearer(self):
+        adapter = GenericHTTPAdapter(
+            endpoint_url="http://localhost:8000/api/kb/",
+            auth_config={"type": "bearer", "token": "sk-test"},
+            headers={"X-Custom": "value"},
+            source_id="my-kb",
+            source_name="My KB",
+            timeout=60,
+        )
+        assert adapter._endpoint_url == "http://localhost:8000/api/kb"
+        assert adapter._auth_config["type"] == "bearer"
+        assert adapter._extra_headers == {"X-Custom": "value"}
+        assert adapter._source_id == "my-kb"
+        assert adapter._source_name == "My KB"
+
+    def test_client_bearer_auth_header(self):
+        adapter = GenericHTTPAdapter(
+            endpoint_url="http://localhost:8000/api/kb",
+            auth_config={"type": "bearer", "token": "sk-test"},
+        )
+        client = adapter._make_client()
+        assert "Bearer sk-test" in str(client.headers.get("Authorization", ""))
+
+    def test_client_basic_auth_header(self):
+        adapter = GenericHTTPAdapter(
+            endpoint_url="http://localhost:8000/api/kb",
+            auth_config={"type": "basic", "username": "user", "password": "pass"},
+        )
+        client = adapter._make_client()
+        auth_header = str(client.headers.get("Authorization", ""))
+        assert auth_header.startswith("Basic ")
+
+    def test_client_api_key_header(self):
+        adapter = GenericHTTPAdapter(
+            endpoint_url="http://localhost:8000/api/kb",
+            auth_config={"type": "api_key", "header_name": "X-API-Key", "api_key": "key123"},
+        )
+        client = adapter._make_client()
+        assert client.headers.get("X-API-Key") == "key123"
+
+
+class TestGenericHTTPAdapterSearch:
+    """GenericHTTPAdapter 检索"""
+
+    @pytest.fixture
+    def adapter(self):
+        return GenericHTTPAdapter(
+            endpoint_url="http://localhost:8000/api/kb",
+            auth_config={"type": "bearer", "token": "sk-test"},
+        )
+
+    @pytest.mark.asyncio
+    async def test_search_standard_response(self, adapter):
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.raise_for_status = MagicMock()
+        mock_resp.json.return_value = {
+            "results": [
+                {
+                    "content": "HTTP 知识库内容",
+                    "score": 0.92,
+                    "doc_id": "d1",
+                    "title": "文档1",
+                    "metadata": {"page": 1},
+                },
+                {
+                    "content": "另一条结果",
+                    "score": 0.85,
+                    "doc_id": "d2",
+                    "title": "文档2",
+                },
+            ]
+        }
+
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        results = await adapter.search("知识查询", top_k=5)
+
+        assert len(results) == 2
+        assert results[0].content == "HTTP 知识库内容"
+        assert results[0].score == 0.92
+        assert results[0].doc_id == "d1"
+        assert results[0].title == "文档1"
+
+        # Verify payload
+        call_args = mock_client.post.call_args
+        assert call_args[0][0] == "/search"
+        payload = call_args[1]["json"]
+        assert payload["query"] == "知识查询"
+        assert payload["top_k"] == 5
+
+    @pytest.mark.asyncio
+    async def test_search_list_response(self, adapter):
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.raise_for_status = MagicMock()
+        mock_resp.json.return_value = [
+            {"content": "直接列表结果", "score": 0.8, "id": "d1"},
+        ]
+
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        results = await adapter.search("test")
+        assert len(results) == 1
+        assert results[0].content == "直接列表结果"
+
+    @pytest.mark.asyncio
+    async def test_search_http_error(self, adapter):
+        import httpx
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 500
+        mock_resp.text = "Internal Server Error"
+        mock_resp.raise_for_status.side_effect = httpx.HTTPStatusError(
+            "500", request=MagicMock(), response=mock_resp
+        )
+
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        results = await adapter.search("test")
+        assert results == []
+
+    @pytest.mark.asyncio
+    async def test_search_unexpected_format(self, adapter):
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.raise_for_status = MagicMock()
+        mock_resp.json.return_value = {"error": "unexpected"}
+
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        results = await adapter.search("test")
+        assert results == []
+
+
+class TestGenericHTTPAdapterIngest:
+    """GenericHTTPAdapter 文档写入"""
+
+    @pytest.mark.asyncio
+    async def test_ingest_success(self):
+        adapter = GenericHTTPAdapter(
+            endpoint_url="http://localhost:8000/api/kb",
+        )
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.raise_for_status = MagicMock()
+        mock_resp.json.return_value = {"ids": ["d1", "d2"]}
+
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        docs = [
+            Document(doc_id="d1", content="内容1", title="文档1"),
+            Document(doc_id="d2", content="内容2", title="文档2"),
+        ]
+        ids = await adapter.ingest(docs)
+
+        assert ids == ["d1", "d2"]
+        call_args = mock_client.post.call_args
+        assert call_args[0][0] == "/ingest"
+        payload = call_args[1]["json"]
+        assert len(payload["documents"]) == 2
+
+    @pytest.mark.asyncio
+    async def test_ingest_http_error(self):
+        import httpx
+
+        adapter = GenericHTTPAdapter(
+            endpoint_url="http://localhost:8000/api/kb",
+        )
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 500
+        mock_resp.text = "Error"
+        mock_resp.raise_for_status.side_effect = httpx.HTTPStatusError(
+            "500", request=MagicMock(), response=mock_resp
+        )
+
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        docs = [Document(doc_id="d1", content="test")]
+        ids = await adapter.ingest(docs)
+        assert ids == []
+
+
+class TestGenericHTTPAdapterDeleteById:
+    """GenericHTTPAdapter 按 ID 删除"""
+
+    @pytest.mark.asyncio
+    async def test_delete_success(self):
+        adapter = GenericHTTPAdapter(
+            endpoint_url="http://localhost:8000/api/kb",
+        )
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+
+        mock_client = AsyncMock()
+        mock_client.delete = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        result = await adapter.delete_by_id("d1")
+        assert result is True
+        mock_client.delete.assert_called_once_with("/documents/d1")
+
+    @pytest.mark.asyncio
+    async def test_delete_not_found(self):
+        adapter = GenericHTTPAdapter(
+            endpoint_url="http://localhost:8000/api/kb",
+        )
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 404
+
+        mock_client = AsyncMock()
+        mock_client.delete = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        result = await adapter.delete_by_id("nonexistent")
+        assert result is False
+
+
+class TestGenericHTTPAdapterGetDocument:
+    """GenericHTTPAdapter 获取文档"""
+
+    @pytest.mark.asyncio
+    async def test_get_document_success(self):
+        adapter = GenericHTTPAdapter(
+            endpoint_url="http://localhost:8000/api/kb",
+        )
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.raise_for_status = MagicMock()
+        mock_resp.json.return_value = {
+            "id": "d1",
+            "content": "文档内容",
+            "title": "测试文档",
+            "metadata": {"page": 1},
+        }
+
+        mock_client = AsyncMock()
+        mock_client.get = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        doc = await adapter.get_document("d1")
+        assert doc is not None
+        assert doc.doc_id == "d1"
+        assert doc.content == "文档内容"
+        assert doc.title == "测试文档"
+
+    @pytest.mark.asyncio
+    async def test_get_document_not_found(self):
+        import httpx
+
+        adapter = GenericHTTPAdapter(
+            endpoint_url="http://localhost:8000/api/kb",
+        )
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 404
+        mock_resp.raise_for_status.side_effect = httpx.HTTPStatusError(
+            "404", request=MagicMock(), response=mock_resp
+        )
+
+        mock_client = AsyncMock()
+        mock_client.get = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        doc = await adapter.get_document("nonexistent")
+        assert doc is None
+
+
+class TestGenericHTTPAdapterHealthCheck:
+    """GenericHTTPAdapter 健康检查"""
+
+    @pytest.mark.asyncio
+    async def test_health_check_ok(self):
+        adapter = GenericHTTPAdapter(
+            endpoint_url="http://localhost:8000/api/kb",
+        )
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+
+        mock_client = AsyncMock()
+        mock_client.get = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        assert await adapter.health_check() is True
+
+    @pytest.mark.asyncio
+    async def test_health_check_fallback_to_root(self):
+        """health endpoint 不存在时回退到根路径"""
+        adapter = GenericHTTPAdapter(
+            endpoint_url="http://localhost:8000/api/kb",
+        )
+
+        import httpx
+
+        # /health returns 404
+        health_resp = MagicMock()
+        health_resp.status_code = 404
+        health_resp.text = "Not Found"
+        health_resp.raise_for_status.side_effect = httpx.HTTPStatusError(
+            "404", request=MagicMock(), response=health_resp
+        )
+
+        # / returns 200
+        root_resp = MagicMock()
+        root_resp.status_code = 200
+
+        mock_client = AsyncMock()
+        mock_client.get = AsyncMock(side_effect=[health_resp, root_resp])
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        assert await adapter.health_check() is True
+
+    @pytest.mark.asyncio
+    async def test_health_check_connection_error(self):
+        adapter = GenericHTTPAdapter(
+            endpoint_url="http://localhost:8000/api/kb",
+        )
+
+        mock_client = AsyncMock()
+        mock_client.get = AsyncMock(side_effect=Exception("Connection refused"))
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        assert await adapter.health_check() is False
+
+
+class TestGenericHTTPAdapterListSources:
+    """GenericHTTPAdapter 列出信息源"""
+
+    @pytest.mark.asyncio
+    async def test_list_sources_success(self):
+        adapter = GenericHTTPAdapter(
+            endpoint_url="http://localhost:8000/api/kb",
+        )
+
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.raise_for_status = MagicMock()
+        mock_resp.json.return_value = [
+            {"source_id": "src-1", "source_name": "知识库1", "source_type": "custom"},
+            {"source_id": "src-2", "source_name": "知识库2", "document_count": 50},
+        ]
+
+        mock_client = AsyncMock()
+        mock_client.get = AsyncMock(return_value=mock_resp)
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        sources = await adapter.list_sources()
+        assert len(sources) == 2
+        assert sources[0].source_name == "知识库1"
+        assert sources[1].document_count == 50
+
+    @pytest.mark.asyncio
+    async def test_list_sources_endpoint_not_found(self):
+        """sources endpoint 不存在时返回默认信息源"""
+        adapter = GenericHTTPAdapter(
+            endpoint_url="http://localhost:8000/api/kb",
+        )
+
+        mock_client = AsyncMock()
+        mock_client.get = AsyncMock(side_effect=Exception("404"))
+        adapter._make_client = MagicMock(return_value=mock_client)
+
+        sources = await adapter.list_sources()
+        assert len(sources) == 1
+        assert sources[0].source_type == "generic_http"
+
+
+# ---------------------------------------------------------------------------
+# Cross-adapter integration tests
+# ---------------------------------------------------------------------------
+
+
+class TestCrossAdapterIntegration:
+    """跨适配器集成测试 — 验证统一 KnowledgeBase 接口"""
+
+    @pytest.mark.asyncio
+    async def test_all_adapters_implement_knowledge_base_protocol(self):
+        """所有适配器都实现 KnowledgeBase 协议"""
+        adapters = [
+            FeishuKBAdapter(app_id="cli_test", app_secret="secret"),
+            ConfluenceAdapter(
+                base_url="https://test.atlassian.net/wiki",
+                username="user@test.com",
+                api_token="token",
+            ),
+            GenericHTTPAdapter(endpoint_url="http://localhost:8000/api/kb"),
+        ]
+        for adapter in adapters:
+            assert isinstance(adapter, KnowledgeBase)
+            assert hasattr(adapter, "ingest")
+            assert hasattr(adapter, "query")
+            assert hasattr(adapter, "delete_by_id")
+            assert hasattr(adapter, "list_sources")
+            assert hasattr(adapter, "health_check")
+
+    @pytest.mark.asyncio
+    async def test_all_adapters_have_search(self):
+        """所有适配器都有 search 方法（query 的别名）"""
+        adapters = [
+            FeishuKBAdapter(app_id="cli_test", app_secret="secret"),
+            ConfluenceAdapter(
+                base_url="https://test.atlassian.net/wiki",
+                username="user@test.com",
+                api_token="token",
+            ),
+            GenericHTTPAdapter(endpoint_url="http://localhost:8000/api/kb"),
+        ]
+        for adapter in adapters:
+            assert hasattr(adapter, "search")
+            assert hasattr(adapter, "get_document")
+            assert hasattr(adapter, "authenticate")
+
+    @pytest.mark.asyncio
+    async def test_unified_search_returns_query_result(self):
+        """统一检索接口返回 QueryResult 类型"""
+        # Feishu
+        feishu = FeishuKBAdapter(app_id="cli_test", app_secret="secret")
+        feishu._access_token = "t-xxx"
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.raise_for_status = MagicMock()
+        mock_resp.json.return_value = {
+            "code": 0,
+            "data": {
+                "items": [
+                    {"wiki_token": "w1", "title": "飞书文档", "content": "内容", "score": 0.9}
+                ]
+            },
+        }
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(return_value=mock_resp)
+        feishu._make_client = MagicMock(return_value=mock_client)
+
+        results = await feishu.search("test")
+        assert all(isinstance(r, QueryResult) for r in results)
+
+        # Confluence
+        confluence = ConfluenceAdapter(
+            base_url="https://test.atlassian.net/wiki",
+            username="user@test.com",
+            api_token="token",
+        )
+        mock_resp2 = MagicMock()
+        mock_resp2.status_code = 200
+        mock_resp2.raise_for_status = MagicMock()
+        mock_resp2.json.return_value = {
+            "results": [
+                {"id": "123", "title": "Confluence 页面", "type": "page",
+                 "body": {"storage": {"value": "<p>内容</p>"}}, "space": {"key": "DEV"}}
+            ]
+        }
+        mock_client2 = AsyncMock()
+        mock_client2.get = AsyncMock(return_value=mock_resp2)
+        confluence._make_client = MagicMock(return_value=mock_client2)
+
+        results = await confluence.search("test")
+        assert all(isinstance(r, QueryResult) for r in results)
+
+        # GenericHTTP
+        generic = GenericHTTPAdapter(endpoint_url="http://localhost:8000/api/kb")
+        mock_resp3 = MagicMock()
+        mock_resp3.status_code = 200
+        mock_resp3.raise_for_status = MagicMock()
+        mock_resp3.json.return_value = {
+            "results": [
+                {"content": "HTTP 内容", "score": 0.8, "doc_id": "d1", "title": "文档"}
+            ]
+        }
+        mock_client3 = AsyncMock()
+        mock_client3.post = AsyncMock(return_value=mock_resp3)
+        generic._make_client = MagicMock(return_value=mock_client3)
+
+        results = await generic.search("test")
+        assert all(isinstance(r, QueryResult) for r in results)
diff --git a/tests/unit/memory/test_document_loader.py b/tests/unit/memory/test_document_loader.py
new file mode 100644
index 0000000..bff89c9
--- /dev/null
+++ b/tests/unit/memory/test_document_loader.py
@@ -0,0 +1,227 @@
+"""DocumentLoader 单元测试 - 多格式文档解析器"""
+
+import pytest
+
+from agentkit.memory.document_loader import Document, DocumentLoader, _detect_format
+
+
+class TestDetectFormat:
+    """格式检测测试"""
+
+    def test_pdf_format(self):
+        assert _detect_format("report.pdf") == "pdf"
+
+    def test_docx_format(self):
+        assert _detect_format("document.docx") == "docx"
+        assert _detect_format("document.doc") == "docx"
+
+    def test_markdown_format(self):
+        assert _detect_format("readme.md") == "markdown"
+        assert _detect_format("notes.markdown") == "markdown"
+
+    def test_html_format(self):
+        assert _detect_format("page.html") == "html"
+        assert _detect_format("page.htm") == "html"
+
+    def test_text_format(self):
+        assert _detect_format("data.txt") == "text"
+        assert _detect_format("data.csv") == "text"
+        assert _detect_format("data.json") == "text"
+
+    def test_unknown_format_falls_back_to_text(self):
+        assert _detect_format("data.xyz") == "text"
+
+
+class TestDocument:
+    """Document 数据类测试"""
+
+    def test_default_metadata(self):
+        doc = Document(doc_id="1", title="Test", content="Hello")
+        assert doc.metadata["source"] == ""
+        assert doc.metadata["format"] == "unknown"
+        assert doc.metadata["page_count"] == 0
+        assert "created_at" in doc.metadata
+
+    def test_custom_metadata(self):
+        doc = Document(
+            doc_id="1",
+            title="Test",
+            content="Hello",
+            metadata={"source": "test.pdf", "format": "pdf", "page_count": 5},
+        )
+        assert doc.metadata["source"] == "test.pdf"
+        assert doc.metadata["format"] == "pdf"
+        assert doc.metadata["page_count"] == 5
+
+    def test_to_dict(self):
+        doc = Document(doc_id="1", title="Test", content="Hello", metadata={"format": "text"})
+        d = doc.to_dict()
+        assert d["doc_id"] == "1"
+        assert d["title"] == "Test"
+        assert d["content"] == "Hello"
+        assert d["metadata"]["format"] == "text"
+
+
+class TestDocumentLoaderText:
+    """纯文本解析测试"""
+
+    def test_load_text_bytes(self):
+        loader = DocumentLoader()
+        content = "Hello, world!\nThis is a test document.".encode("utf-8")
+        doc = loader.load_bytes(content, "test.txt")
+
+        assert doc.title == "test"
+        assert doc.content == "Hello, world!\nThis is a test document."
+        assert doc.metadata["format"] == "text"
+        assert doc.metadata["source"] == "test.txt"
+        assert doc.metadata["parser"] == "text"
+        assert doc.doc_id  # 非空 UUID
+
+    def test_load_text_file(self, tmp_path):
+        loader = DocumentLoader()
+        text_file = tmp_path / "sample.txt"
+        text_file.write_text("Sample text content", encoding="utf-8")
+
+        doc = loader.load(text_file)
+        assert doc.content == "Sample text content"
+        assert doc.metadata["format"] == "text"
+
+    def test_load_nonexistent_file(self):
+        loader = DocumentLoader()
+        with pytest.raises(FileNotFoundError):
+            loader.load("/nonexistent/path/file.txt")
+
+
+class TestDocumentLoaderMarkdown:
+    """Markdown 解析测试"""
+
+    def test_load_markdown_bytes(self):
+        loader = DocumentLoader()
+        md_content = """# Project Title
+
+## Introduction
+
+This is the introduction section.
+
+## Details
+
+Some details here.
+"""
+        doc = loader.load_bytes(md_content.encode("utf-8"), "readme.md")
+
+        assert doc.metadata["format"] == "markdown"
+        assert doc.metadata["title"] == "Project Title"
+        assert "Introduction" in doc.content
+        assert "Details" in doc.content
+
+    def test_markdown_without_title(self):
+        loader = DocumentLoader()
+        md_content = "Just some text without a heading."
+        doc = loader.load_bytes(md_content.encode("utf-8"), "notes.md")
+
+        assert doc.metadata["format"] == "markdown"
+        assert doc.content == "Just some text without a heading."
+
+
+class TestDocumentLoaderHTML:
+    """HTML 解析测试"""
+
+    def test_load_html_with_beautifulsoup(self):
+        """测试 BeautifulSoup 解析（如果可用）"""
+        loader = DocumentLoader()
+        html_content = """<!DOCTYPE html>
+<html>
+<head><title>Test Page</title></head>
+<body>
+<script>var x = 1;</script>
+<style>.cls { color: red; }</style>
+<h1>Hello</h1>
+<p>This is a paragraph.</p>
+</body>
+</html>"""
+        doc = loader.load_bytes(html_content.encode("utf-8"), "page.html")
+
+        assert doc.metadata["format"] == "html"
+        # BeautifulSoup 应该移除 script/style 标签
+        # 如果 BeautifulSoup 不可用，则回退到文本
+        if doc.metadata.get("parser") == "beautifulsoup":
+            assert "Test Page" in doc.metadata.get("title", "") or "Hello" in doc.content
+            assert "var x" not in doc.content
+            assert ".cls" not in doc.content
+            assert "Hello" in doc.content
+        else:
+            # 纯文本回退，内容可能包含 HTML 标签
+            assert len(doc.content) > 0
+
+    def test_load_html_fallback_to_text(self):
+        """即使没有 BeautifulSoup，HTML 也能作为文本加载"""
+        loader = DocumentLoader()
+        html_content = "<html><body>Simple content</body></html>"
+        doc = loader.load_bytes(html_content.encode("utf-8"), "page.html")
+
+        assert doc.metadata["format"] == "html"
+        assert len(doc.content) > 0
+
+
+class TestDocumentLoaderPDF:
+    """PDF 解析测试"""
+
+    def test_load_pdf_without_parser(self):
+        """没有 PDF 解析器时回退到文本"""
+        loader = DocumentLoader()
+        # 传入一个非 PDF 二进制内容，模拟解析失败后的回退
+        content = b"%PDF-1.4 fake pdf content"
+        doc = loader.load_bytes(content, "report.pdf")
+
+        assert doc.metadata["format"] == "pdf"
+        # 即使解析失败，也应该返回文档对象（内容可能为空或乱码）
+        assert isinstance(doc, Document)
+
+
+class TestDocumentLoaderDocx:
+    """Word 解析测试"""
+
+    def test_load_docx_without_parser(self):
+        """没有 python-docx 时回退到文本"""
+        loader = DocumentLoader()
+        # 传入一个非 docx 二进制内容
+        content = b"PK\x03\x04 fake docx content"
+        doc = loader.load_bytes(content, "document.docx")
+
+        assert doc.metadata["format"] == "docx"
+        assert isinstance(doc, Document)
+
+
+class TestDocumentLoaderEdgeCases:
+    """边界情况测试"""
+
+    def test_empty_content(self):
+        loader = DocumentLoader()
+        doc = loader.load_bytes(b"", "empty.txt")
+        assert doc.content == ""
+        assert doc.metadata["format"] == "text"
+
+    def test_unicode_content(self):
+        loader = DocumentLoader()
+        content = "中文内容测试\n日本語テスト\n한국어 테스트".encode("utf-8")
+        doc = loader.load_bytes(content, "unicode.txt")
+        assert "中文内容测试" in doc.content
+        assert "日本語テスト" in doc.content
+
+    def test_large_content(self):
+        loader = DocumentLoader()
+        content = "A" * 1_000_000  # 1MB text
+        doc = loader.load_bytes(content.encode("utf-8"), "large.txt")
+        assert len(doc.content) == 1_000_000
+
+    def test_filename_with_spaces(self):
+        loader = DocumentLoader()
+        content = "Test content".encode("utf-8")
+        doc = loader.load_bytes(content, "my document.txt")
+        assert doc.title == "my document"
+
+    def test_filename_with_path(self):
+        loader = DocumentLoader()
+        content = "Test content".encode("utf-8")
+        doc = loader.load_bytes(content, "reports/2024/summary.md")
+        assert doc.metadata["format"] == "markdown"
diff --git a/tests/unit/memory/test_local_rag.py b/tests/unit/memory/test_local_rag.py
new file mode 100644
index 0000000..8a38fa4
--- /dev/null
+++ b/tests/unit/memory/test_local_rag.py
@@ -0,0 +1,522 @@
+"""LocalRAGService 单元测试 - 本地文档 RAG 服务
+
+使用 InMemoryLocalRAGService 进行测试，无需 pgvector 依赖。
+同时测试分块策略（TextChunker / StructuralChunker）。
+"""
+
+import pytest
+
+from agentkit.memory.chunking import Chunk, StructuralChunker, TextChunker
+from agentkit.memory.document_loader import Document as LoaderDocument
+from agentkit.memory.embedder import MockEmbedder
+from agentkit.memory.knowledge_base import Document, KnowledgeBase, QueryResult, SourceInfo
+from agentkit.memory.local_rag import InMemoryLocalRAGService
+
+
+# ── Fixtures ──────────────────────────────────────────────
+
+
+@pytest.fixture
+def embedder():
+    return MockEmbedder(dimension=128)
+
+
+@pytest.fixture
+def rag_service(embedder):
+    return InMemoryLocalRAGService(embedder=embedder, chunk_size=500, chunk_overlap=50)
+
+
+@pytest.fixture
+def sample_documents():
+    """knowledge_base.Document 格式的测试文档"""
+    return [
+        Document(
+            doc_id="doc-1",
+            content="Python 是一种通用编程语言。它支持多种编程范式，包括面向对象、命令式、函数式和过程式编程。Python 的设计哲学强调代码的可读性和简洁性。",
+            title="Python 入门指南",
+            source_id="python_intro.txt",
+            metadata={"source": "python_intro.txt", "format": "text"},
+        ),
+        Document(
+            doc_id="doc-2",
+            content="机器学习是人工智能的一个分支，它使计算机系统能够从数据中学习和改进。常见的机器学习算法包括线性回归、决策树、支持向量机和神经网络。",
+            title="机器学习基础",
+            source_id="ml_basics.txt",
+            metadata={"source": "ml_basics.txt", "format": "text"},
+        ),
+    ]
+
+
+@pytest.fixture
+def markdown_document():
+    return Document(
+        doc_id="doc-md-1",
+        content="""# API 文档
+
+## 认证
+
+所有 API 请求需要 Bearer Token 认证。请在请求头中添加 Authorization 字段。
+
+## 用户接口
+
+### 获取用户信息
+
+GET /api/users/{id}
+
+返回指定用户的详细信息。
+
+### 创建用户
+
+POST /api/users
+
+创建一个新用户。
+
+## 数据接口
+
+### 查询数据
+
+POST /api/data/query
+
+根据条件查询数据。
+""",
+        title="API 文档",
+        source_id="api_doc.md",
+        metadata={"source": "api_doc.md", "format": "markdown"},
+    )
+
+
+# ── TextChunker 测试 ──────────────────────────────────────
+
+
+class TestTextChunker:
+    """TextChunker 单元测试"""
+
+    def test_chunk_short_text(self):
+        chunker = TextChunker(chunk_size=1000, chunk_overlap=100)
+        chunks = chunker.chunk("Short text", source_doc_id="doc-1")
+
+        assert len(chunks) == 1
+        assert chunks[0].content == "Short text"
+        assert chunks[0].metadata["source_doc"] == "doc-1"
+        assert chunks[0].metadata["position"] == 0
+
+    def test_chunk_empty_text(self):
+        chunker = TextChunker(chunk_size=1000, chunk_overlap=100)
+        chunks = chunker.chunk("", source_doc_id="doc-1")
+        assert len(chunks) == 0
+
+    def test_chunk_whitespace_only(self):
+        chunker = TextChunker(chunk_size=1000, chunk_overlap=100)
+        chunks = chunker.chunk("   \n\n  \t  ", source_doc_id="doc-1")
+        assert len(chunks) == 0
+
+    def test_chunk_long_text(self):
+        chunker = TextChunker(chunk_size=100, chunk_overlap=20)
+        text = "A" * 300
+        chunks = chunker.chunk(text, source_doc_id="doc-1")
+
+        assert len(chunks) >= 2
+        # 每个块不超过 chunk_size（允许少量超出用于句子边界）
+        for chunk in chunks:
+            assert len(chunk.content) <= 150  # 允许一些余量
+
+    def test_chunk_preserves_metadata(self):
+        chunker = TextChunker(chunk_size=1000, chunk_overlap=100)
+        chunks = chunker.chunk(
+            "Some content",
+            source_doc_id="doc-1",
+            metadata={"format": "pdf", "page_count": 5},
+        )
+
+        assert len(chunks) == 1
+        assert chunks[0].metadata["format"] == "pdf"
+        assert chunks[0].metadata["page_count"] == 5
+        assert chunks[0].metadata["source_doc"] == "doc-1"
+
+    def test_chunk_with_multiple_paragraphs(self):
+        chunker = TextChunker(chunk_size=200, chunk_overlap=20, separator="\n\n")
+        text = "第一段内容，包含一些文字。\n\n第二段内容，也有一些文字。\n\n第三段内容，同样有文字。"
+        chunks = chunker.chunk(text, source_doc_id="doc-1")
+
+        assert len(chunks) >= 1
+        for chunk in chunks:
+            assert len(chunk.content) > 0
+
+    def test_invalid_overlap(self):
+        with pytest.raises(ValueError):
+            TextChunker(chunk_size=100, chunk_overlap=100)
+
+    def test_chunk_with_separator(self):
+        chunker = TextChunker(chunk_size=200, chunk_overlap=20, separator="\n\n")
+        text = "第一段内容\n\n第二段内容\n\n第三段内容"
+        chunks = chunker.chunk(text, source_doc_id="doc-1")
+
+        assert len(chunks) >= 1
+        for chunk in chunks:
+            assert len(chunk.content) > 0
+
+
+class TestStructuralChunker:
+    """StructuralChunker 单元测试"""
+
+    def test_chunk_markdown_by_headings(self):
+        chunker = StructuralChunker(chunk_size=1000, chunk_overlap=50)
+        md = """# Title
+
+## Section A
+
+Content for section A.
+
+## Section B
+
+Content for section B.
+
+## Section C
+
+Content for section C."""
+        chunks = chunker.chunk(md, source_doc_id="doc-1")
+
+        assert len(chunks) >= 3
+        # 每个块应该有标题元数据
+        headings = [c.metadata.get("heading") for c in chunks]
+        assert "Section A" in headings
+        assert "Section B" in headings
+        assert "Section C" in headings
+
+    def test_chunk_markdown_no_headings(self):
+        chunker = StructuralChunker(chunk_size=1000, chunk_overlap=50)
+        md = "Just some text without any headings."
+        chunks = chunker.chunk(md, source_doc_id="doc-1")
+
+        assert len(chunks) == 1
+        assert chunks[0].content == "Just some text without any headings."
+
+    def test_chunk_empty_text(self):
+        chunker = StructuralChunker(chunk_size=1000, chunk_overlap=50)
+        chunks = chunker.chunk("", source_doc_id="doc-1")
+        assert len(chunks) == 0
+
+    def test_chunk_large_section_falls_back_to_text_chunker(self):
+        chunker = StructuralChunker(chunk_size=100, chunk_overlap=20)
+        md = """# Large Section
+
+""" + "A" * 300
+        chunks = chunker.chunk(md, source_doc_id="doc-1")
+
+        # 大段应被 TextChunker 进一步切分
+        assert len(chunks) >= 2
+        for chunk in chunks:
+            assert chunk.metadata.get("heading") == "Large Section"
+
+    def test_heading_levels(self):
+        chunker = StructuralChunker(chunk_size=1000, heading_levels=2)
+        md = """# H1
+
+Content 1.
+
+## H2
+
+Content 2.
+
+### H3
+
+This should be part of H2 section since heading_levels=2.
+"""
+        chunks = chunker.chunk(md, source_doc_id="doc-1")
+        # H3 不应该作为独立标题分割
+        assert len(chunks) >= 2
+
+
+# ── Chunk 数据类测试 ──────────────────────────────────────
+
+
+class TestChunk:
+    """Chunk 数据类测试"""
+
+    def test_default_metadata(self):
+        chunk = Chunk(chunk_id="c1", content="test")
+        assert chunk.metadata["source_doc"] == ""
+        assert chunk.metadata["position"] == 0
+
+    def test_to_dict(self):
+        chunk = Chunk(
+            chunk_id="c1",
+            content="test content",
+            metadata={"source_doc": "doc-1", "position": 0},
+        )
+        d = chunk.to_dict()
+        assert d["chunk_id"] == "c1"
+        assert d["content"] == "test content"
+        assert d["metadata"]["source_doc"] == "doc-1"
+
+
+# ── InMemoryLocalRAGService 测试 ──────────────────────────
+
+
+class TestInMemoryLocalRAGService:
+    """InMemoryLocalRAGService 单元测试"""
+
+    @pytest.mark.asyncio
+    async def test_ingest_documents(self, rag_service, sample_documents):
+        ids = await rag_service.ingest(sample_documents)
+
+        assert len(ids) == 2
+        assert "doc-1" in ids
+        assert "doc-2" in ids
+
+    @pytest.mark.asyncio
+    async def test_query_after_ingest(self, rag_service, sample_documents):
+        await rag_service.ingest(sample_documents)
+
+        results = await rag_service.query("编程语言", top_k=2)
+
+        assert len(results) >= 1
+        assert all(isinstance(r, QueryResult) for r in results)
+        # 结果应该包含相关内容
+        assert any("Python" in r.content or "编程" in r.content for r in results)
+
+    @pytest.mark.asyncio
+    async def test_query_returns_source_info(self, rag_service, sample_documents):
+        await rag_service.ingest(sample_documents)
+
+        results = await rag_service.query("机器学习", top_k=5)
+
+        assert len(results) >= 1
+        for r in results:
+            assert r.source_id != ""
+            assert r.source_name != ""
+
+    @pytest.mark.asyncio
+    async def test_query_no_results_when_empty(self, rag_service):
+        results = await rag_service.query("anything", top_k=5)
+        assert len(results) == 0
+
+    @pytest.mark.asyncio
+    async def test_delete_by_id(self, rag_service, sample_documents):
+        await rag_service.ingest(sample_documents)
+
+        deleted = await rag_service.delete_by_id("doc-1")
+        assert deleted is True
+
+        # 删除后查询不应返回该文档的内容
+        results = await rag_service.query("Python", top_k=5)
+        assert all(r.source_id != "doc-1" for r in results)
+
+    @pytest.mark.asyncio
+    async def test_delete_nonexistent_id(self, rag_service):
+        deleted = await rag_service.delete_by_id("nonexistent")
+        assert deleted is False
+
+    @pytest.mark.asyncio
+    async def test_list_sources(self, rag_service, sample_documents):
+        await rag_service.ingest(sample_documents)
+
+        sources = await rag_service.list_sources()
+
+        assert len(sources) == 2
+        source_ids = {s.source_id for s in sources}
+        assert "doc-1" in source_ids
+        assert "doc-2" in source_ids
+
+        for s in sources:
+            assert isinstance(s, SourceInfo)
+            assert s.source_name != ""
+            assert s.document_count > 0
+
+    @pytest.mark.asyncio
+    async def test_list_sources_empty(self, rag_service):
+        sources = await rag_service.list_sources()
+        assert len(sources) == 0
+
+    @pytest.mark.asyncio
+    async def test_health_check(self, rag_service):
+        assert await rag_service.health_check() is True
+
+    @pytest.mark.asyncio
+    async def test_ingest_markdown_with_structural_chunking(self, rag_service, markdown_document):
+        ids = await rag_service.ingest([markdown_document])
+
+        assert len(ids) == 1
+        sources = await rag_service.list_sources()
+        assert len(sources) == 1
+        assert sources[0].source_type == "markdown"
+
+    @pytest.mark.asyncio
+    async def test_query_markdown_by_section(self, rag_service, markdown_document):
+        await rag_service.ingest([markdown_document])
+
+        results = await rag_service.query("认证", top_k=3)
+
+        # MockEmbedder 基于文本哈希，语义相关性不保证，
+        # 但应至少返回结果（因为文档已被摄取）
+        assert len(results) >= 0  # 可能因阈值过滤无结果
+        # 使用与文档内容更相似的查询词来验证检索
+        results = await rag_service.query("API 文档 认证", top_k=3)
+        assert len(results) >= 1
+
+    @pytest.mark.asyncio
+    async def test_ingest_empty_document(self, rag_service):
+        doc = Document(
+            doc_id="empty-doc",
+            content="",
+            title="Empty",
+            source_id="empty.txt",
+            metadata={"source": "empty.txt", "format": "text"},
+        )
+        ids = await rag_service.ingest([doc])
+
+        # 空文档应该被跳过（没有块生成）
+        assert len(ids) == 1  # doc_id 仍然返回
+        sources = await rag_service.list_sources()
+        assert len(sources) == 1
+        assert sources[0].document_count == 0
+
+    @pytest.mark.asyncio
+    async def test_ingest_large_document_chunking(self, embedder):
+        """大文件分块 → 块大小在配置范围内"""
+        rag = InMemoryLocalRAGService(embedder=embedder, chunk_size=200, chunk_overlap=20)
+
+        large_content = "这是一段很长的文本。" * 200  # ~2000 字符
+        doc = Document(
+            doc_id="large-doc",
+            content=large_content,
+            title="Large Document",
+            source_id="large.txt",
+            metadata={"source": "large.txt", "format": "text"},
+        )
+        ids = await rag.ingest([doc])
+
+        assert len(ids) == 1
+        sources = await rag.list_sources()
+        assert sources[0].document_count > 1  # 应该被分成多个块
+
+    @pytest.mark.asyncio
+    async def test_query_result_has_score(self, rag_service, sample_documents):
+        await rag_service.ingest(sample_documents)
+
+        results = await rag_service.query("编程", top_k=5)
+
+        for r in results:
+            assert 0.0 <= r.score <= 1.0
+
+    @pytest.mark.asyncio
+    async def test_ingest_loader_document(self, rag_service):
+        """测试传入 document_loader.Document 时的自动转换"""
+        loader_doc = LoaderDocument(
+            doc_id="loader-doc-1",
+            title="Test Loader Doc",
+            content="This is content from document_loader.",
+            metadata={"source": "test.txt", "format": "text"},
+        )
+        ids = await rag_service.ingest([loader_doc])
+
+        assert len(ids) == 1
+        results = await rag_service.query("content", top_k=3)
+        assert len(results) >= 1
+
+    @pytest.mark.asyncio
+    async def test_multiple_ingest_same_doc_id(self, rag_service):
+        """重复摄取相同 doc_id 的文档"""
+        doc1 = Document(
+            doc_id="same-id",
+            content="First version content",
+            title="Version 1",
+            source_id="v1.txt",
+            metadata={"source": "v1.txt", "format": "text"},
+        )
+        doc2 = Document(
+            doc_id="same-id",
+            content="Second version content with more text",
+            title="Version 2",
+            source_id="v2.txt",
+            metadata={"source": "v2.txt", "format": "text"},
+        )
+
+        await rag_service.ingest([doc1])
+        await rag_service.ingest([doc2])
+
+        # 第二次摄取会覆盖（内存实现中 doc_id 相同会覆盖）
+        sources = await rag_service.list_sources()
+        source_ids = [s.source_id for s in sources]
+        assert "same-id" in source_ids
+
+
+# ── KnowledgeBase 协议测试 ────────────────────────────────
+
+
+class TestKnowledgeBaseProtocol:
+    """KnowledgeBase 协议兼容性测试"""
+
+    @pytest.mark.asyncio
+    async def test_inmemory_service_implements_protocol(self, rag_service):
+        """InMemoryLocalRAGService 应该满足 KnowledgeBase 协议"""
+        assert isinstance(rag_service, KnowledgeBase)
+
+    @pytest.mark.asyncio
+    async def test_protocol_methods_exist(self, rag_service):
+        """验证所有协议方法都存在"""
+        assert hasattr(rag_service, "ingest")
+        assert hasattr(rag_service, "query")
+        assert hasattr(rag_service, "delete_by_id")
+        assert hasattr(rag_service, "list_sources")
+        assert hasattr(rag_service, "health_check")
+
+        # 验证方法可调用
+        assert callable(rag_service.ingest)
+        assert callable(rag_service.query)
+        assert callable(rag_service.delete_by_id)
+        assert callable(rag_service.list_sources)
+        assert callable(rag_service.health_check)
+
+
+# ── QueryResult / SourceInfo 测试 ─────────────────────────
+
+
+class TestQueryResult:
+    """QueryResult 数据类测试"""
+
+    def test_creation(self):
+        result = QueryResult(
+            content="test content",
+            source_id="doc-1",
+            source_name="Test Doc",
+            score=0.95,
+        )
+        assert result.content == "test content"
+        assert result.source_id == "doc-1"
+        assert result.source_name == "Test Doc"
+        assert result.score == 0.95
+
+    def test_with_optional_fields(self):
+        result = QueryResult(
+            content="test content",
+            source_id="doc-1",
+            source_name="Test Doc",
+            score=0.95,
+            metadata={"position": 0},
+            doc_id="doc-1",
+            title="Test Doc",
+        )
+        assert result.doc_id == "doc-1"
+        assert result.title == "Test Doc"
+        assert result.metadata["position"] == 0
+
+
+class TestSourceInfo:
+    """SourceInfo 数据类测试"""
+
+    def test_creation(self):
+        from datetime import datetime, timezone
+
+        now = datetime.now(timezone.utc)
+        info = SourceInfo(
+            source_id="doc-1",
+            source_name="Test",
+            source_type="local",
+            document_count=5,
+            last_updated=now,
+        )
+        assert info.source_id == "doc-1"
+        assert info.source_name == "Test"
+        assert info.source_type == "local"
+        assert info.document_count == 5
diff --git a/tests/unit/memory/test_multi_source_rag.py b/tests/unit/memory/test_multi_source_rag.py
new file mode 100644
index 0000000..858af93
--- /dev/null
+++ b/tests/unit/memory/test_multi_source_rag.py
@@ -0,0 +1,610 @@
+"""MultiSourceRAG 单元测试 - 多源混合检索
+
+测试场景：
+- 指定单个信息源 → 仅从该源检索
+- 指定多个信息源 → 并行检索，结果融合排序
+- 不指定信息源 → 从所有可用源检索
+- 来源追溯 → 每个结果包含来源信息
+- AE4: 指定"合规文档库"和"法务知识库" → 仅从这两个源检索
+"""
+
+import pytest
+
+from agentkit.memory.embedder import MockEmbedder
+from agentkit.memory.knowledge_base import Document, KnowledgeBase, QueryResult, SourceInfo
+from agentkit.memory.local_rag import InMemoryLocalRAGService
+from agentkit.memory.multi_source_retriever import MultiSourceRetriever
+from agentkit.memory.retriever import MemoryRetriever
+
+
+# ── Fixtures ──────────────────────────────────────────────
+
+
+@pytest.fixture
+def embedder():
+    return MockEmbedder(dimension=128)
+
+
+@pytest.fixture
+def local_rag(embedder):
+    """本地合规文档库"""
+    return InMemoryLocalRAGService(embedder=embedder, chunk_size=500, chunk_overlap=50)
+
+
+@pytest.fixture
+def legal_rag(embedder):
+    """法务知识库"""
+    return InMemoryLocalRAGService(embedder=embedder, chunk_size=500, chunk_overlap=50)
+
+
+@pytest.fixture
+def tech_rag(embedder):
+    """技术文档库"""
+    return InMemoryLocalRAGService(embedder=embedder, chunk_size=500, chunk_overlap=50)
+
+
+@pytest.fixture
+def compliance_docs():
+    """合规文档"""
+    return [
+        Document(
+            doc_id="compliance-1",
+            content="数据保护合规要求：所有用户数据必须加密存储，访问需经授权审批。",
+            title="数据保护合规指南",
+            source_id="compliance_data_protection",
+            metadata={"source": "compliance_data_protection", "format": "text"},
+        ),
+        Document(
+            doc_id="compliance-2",
+            content="跨境数据传输需遵守 GDPR 和中国网络安全法的相关规定。",
+            title="跨境数据传输合规",
+            source_id="compliance_cross_border",
+            metadata={"source": "compliance_cross_border", "format": "text"},
+        ),
+    ]
+
+
+@pytest.fixture
+def legal_docs():
+    """法务文档"""
+    return [
+        Document(
+            doc_id="legal-1",
+            content="合同审查要点：注意违约责任条款、知识产权归属和保密义务。",
+            title="合同审查指南",
+            source_id="legal_contract_review",
+            metadata={"source": "legal_contract_review", "format": "text"},
+        ),
+        Document(
+            doc_id="legal-2",
+            content="劳动法规定：员工加班需支付加班费，标准为平时工资的1.5倍至3倍。",
+            title="劳动法要点",
+            source_id="legal_labor_law",
+            metadata={"source": "legal_labor_law", "format": "text"},
+        ),
+    ]
+
+
+@pytest.fixture
+def tech_docs():
+    """技术文档"""
+    return [
+        Document(
+            doc_id="tech-1",
+            content="API 网关配置：限流策略为每分钟 1000 次请求，超时设置 30 秒。",
+            title="API 网关配置手册",
+            source_id="tech_api_gateway",
+            metadata={"source": "tech_api_gateway", "format": "text"},
+        ),
+    ]
+
+
+# ── MultiSourceRetriever 核心测试 ─────────────────────────
+
+
+class TestMultiSourceRetrieverBasic:
+    """MultiSourceRetriever 基础功能测试"""
+
+    def test_register_source(self, local_rag, legal_rag):
+        retriever = MultiSourceRetriever()
+        retriever.register_source("local:合规文档", local_rag)
+        retriever.register_source("法务知识库", legal_rag)
+
+        names = retriever.get_source_names()
+        assert "local:合规文档" in names
+        assert "法务知识库" in names
+
+    def test_register_source_via_constructor(self, local_rag, legal_rag):
+        retriever = MultiSourceRetriever(
+            sources={"local:合规文档": local_rag, "法务知识库": legal_rag}
+        )
+
+        names = retriever.get_source_names()
+        assert len(names) == 2
+
+    def test_unregister_source(self, local_rag, legal_rag):
+        retriever = MultiSourceRetriever(
+            sources={"local:合规文档": local_rag, "法务知识库": legal_rag}
+        )
+
+        result = retriever.unregister_source("local:合规文档")
+        assert result is True
+        assert "local:合规文档" not in retriever.get_source_names()
+
+    def test_unregister_nonexistent_source(self, local_rag):
+        retriever = MultiSourceRetriever(sources={"local:合规文档": local_rag})
+
+        result = retriever.unregister_source("不存在")
+        assert result is False
+
+    @pytest.mark.asyncio
+    async def test_list_all_sources(self, local_rag, legal_rag, compliance_docs, legal_docs):
+        await local_rag.ingest(compliance_docs)
+        await legal_rag.ingest(legal_docs)
+
+        retriever = MultiSourceRetriever(
+            sources={"local:合规文档": local_rag, "法务知识库": legal_rag}
+        )
+
+        sources = await retriever.list_all_sources()
+        assert "local:合规文档" in sources
+        assert "法务知识库" in sources
+        for name, info in sources.items():
+            assert isinstance(info, SourceInfo)
+
+
+class TestMultiSourceRetrieverSearch:
+    """MultiSourceRetriever 检索功能测试"""
+
+    @pytest.mark.asyncio
+    async def test_search_single_source(
+        self, local_rag, legal_rag, compliance_docs, legal_docs
+    ):
+        """指定单个信息源 → 仅从该源检索"""
+        await local_rag.ingest(compliance_docs)
+        await legal_rag.ingest(legal_docs)
+
+        retriever = MultiSourceRetriever(
+            sources={"local:合规文档": local_rag, "法务知识库": legal_rag}
+        )
+
+        # 仅从合规文档库检索
+        results = await retriever.search("合规", top_k=5, sources=["local:合规文档"])
+
+        # 所有结果应来自合规文档库
+        for r in results:
+            assert r.source_name == "local:合规文档"
+
+    @pytest.mark.asyncio
+    async def test_search_multiple_sources(
+        self, local_rag, legal_rag, compliance_docs, legal_docs
+    ):
+        """指定多个信息源 → 并行检索，结果融合排序"""
+        await local_rag.ingest(compliance_docs)
+        await legal_rag.ingest(legal_docs)
+
+        retriever = MultiSourceRetriever(
+            sources={"local:合规文档": local_rag, "法务知识库": legal_rag}
+        )
+
+        results = await retriever.search(
+            "合规 法务", top_k=10, sources=["local:合规文档", "法务知识库"]
+        )
+
+        # 结果应来自两个源
+        source_names = {r.source_name for r in results}
+        assert source_names.issubset({"local:合规文档", "法务知识库"})
+
+    @pytest.mark.asyncio
+    async def test_search_all_sources_when_none_specified(
+        self, local_rag, legal_rag, tech_rag, compliance_docs, legal_docs, tech_docs
+    ):
+        """不指定信息源 → 从所有可用源检索"""
+        await local_rag.ingest(compliance_docs)
+        await legal_rag.ingest(legal_docs)
+        await tech_rag.ingest(tech_docs)
+
+        retriever = MultiSourceRetriever(
+            sources={
+                "local:合规文档": local_rag,
+                "法务知识库": legal_rag,
+                "技术文档库": tech_rag,
+            }
+        )
+
+        results = await retriever.search("合规 法务 技术", top_k=10)
+
+        # 结果应来自所有三个源
+        source_names = {r.source_name for r in results}
+        assert len(source_names) >= 1  # 至少有一个源返回结果
+
+    @pytest.mark.asyncio
+    async def test_search_no_sources_registered(self):
+        """无信息源注册时返回空结果"""
+        retriever = MultiSourceRetriever()
+
+        results = await retriever.search("anything", top_k=5)
+        assert len(results) == 0
+
+    @pytest.mark.asyncio
+    async def test_search_nonexistent_source(self, local_rag, compliance_docs):
+        """指定不存在的源 → 跳过，返回空结果"""
+        await local_rag.ingest(compliance_docs)
+
+        retriever = MultiSourceRetriever(sources={"local:合规文档": local_rag})
+
+        results = await retriever.search("合规", top_k=5, sources=["不存在的源"])
+        assert len(results) == 0
+
+    @pytest.mark.asyncio
+    async def test_search_with_weights(
+        self, local_rag, legal_rag, compliance_docs, legal_docs
+    ):
+        """带权重检索 → 特定源分数被调整"""
+        await local_rag.ingest(compliance_docs)
+        await legal_rag.ingest(legal_docs)
+
+        retriever = MultiSourceRetriever(
+            sources={"local:合规文档": local_rag, "法务知识库": legal_rag}
+        )
+
+        # 先不带权重检索
+        results_no_weight = await retriever.search(
+            "合规", top_k=10, sources=["local:合规文档", "法务知识库"]
+        )
+
+        # 带权重检索：提升合规文档库
+        results_with_weight = await retriever.search(
+            "合规",
+            top_k=10,
+            sources=["local:合规文档", "法务知识库"],
+            weights={"local:合规文档": 2.0},
+        )
+
+        # 有权重时合规文档库的分数应更高
+        compliance_scores_weighted = [
+            r.score for r in results_with_weight if r.source_name == "local:合规文档"
+        ]
+        compliance_scores_unweighted = [
+            r.score for r in results_no_weight if r.source_name == "local:合规文档"
+        ]
+
+        if compliance_scores_weighted and compliance_scores_unweighted:
+            assert max(compliance_scores_weighted) >= max(compliance_scores_unweighted)
+
+
+class TestMultiSourceRetrieverSourceTracing:
+    """来源追溯测试"""
+
+    @pytest.mark.asyncio
+    async def test_result_contains_source_info(
+        self, local_rag, legal_rag, compliance_docs, legal_docs
+    ):
+        """每个检索结果包含来源追溯信息"""
+        await local_rag.ingest(compliance_docs)
+        await legal_rag.ingest(legal_docs)
+
+        retriever = MultiSourceRetriever(
+            sources={"local:合规文档": local_rag, "法务知识库": legal_rag}
+        )
+
+        results = await retriever.search("合规", top_k=5)
+
+        for r in results:
+            # source_id 应非空
+            assert r.source_id != ""
+            # source_name 应为注册的源名称
+            assert r.source_name in ("local:合规文档", "法务知识库")
+            # title 应非空
+            assert r.title != ""
+
+    @pytest.mark.asyncio
+    async def test_result_contains_document_title(
+        self, local_rag, compliance_docs
+    ):
+        """检索结果包含文档标题"""
+        await local_rag.ingest(compliance_docs)
+
+        retriever = MultiSourceRetriever(sources={"local:合规文档": local_rag})
+
+        results = await retriever.search("数据保护", top_k=5)
+
+        for r in results:
+            assert r.title != ""
+            assert r.doc_id != ""
+
+
+class TestMultiSourceRetrieverDedup:
+    """去重测试"""
+
+    @pytest.mark.asyncio
+    async def test_deduplicate_identical_content(
+        self, local_rag, legal_rag, embedder
+    ):
+        """相同内容从不同源返回时去重，保留高分"""
+        # 两个源包含相同内容
+        same_doc = Document(
+            doc_id="same-doc",
+            content="这是一段完全相同的内容用于测试去重功能。",
+            title="重复文档",
+            source_id="same_source",
+            metadata={"source": "same_source", "format": "text"},
+        )
+        await local_rag.ingest([same_doc])
+        await legal_rag.ingest([same_doc])
+
+        retriever = MultiSourceRetriever(
+            sources={"local:合规文档": local_rag, "法务知识库": legal_rag}
+        )
+
+        results = await retriever.search("去重", top_k=10)
+
+        # 相同内容应去重，只保留一个
+        content_counts: dict[str, int] = {}
+        for r in results:
+            content_counts[r.content] = content_counts.get(r.content, 0) + 1
+
+        for content, count in content_counts.items():
+            assert count == 1, f"内容 '{content[:30]}...' 出现了 {count} 次，应去重为 1 次"
+
+
+# ── AE4: 合规文档库 + 法务知识库指定检索 ──────────────────
+
+
+class TestAE4ComplianceAndLegalSearch:
+    """AE4 场景：指定"合规文档库"和"法务知识库" → 仅从这两个源检索"""
+
+    @pytest.mark.asyncio
+    async def test_search_compliance_and_legal_only(
+        self, local_rag, legal_rag, tech_rag, compliance_docs, legal_docs, tech_docs
+    ):
+        """指定合规和法务源 → 不从技术文档库检索"""
+        await local_rag.ingest(compliance_docs)
+        await legal_rag.ingest(legal_docs)
+        await tech_rag.ingest(tech_docs)
+
+        retriever = MultiSourceRetriever(
+            sources={
+                "合规文档库": local_rag,
+                "法务知识库": legal_rag,
+                "技术文档库": tech_rag,
+            }
+        )
+
+        results = await retriever.search(
+            "合规 法务", top_k=10, sources=["合规文档库", "法务知识库"]
+        )
+
+        # 结果不应来自技术文档库
+        for r in results:
+            assert r.source_name != "技术文档库"
+            assert r.source_name in ("合规文档库", "法务知识库")
+
+    @pytest.mark.asyncio
+    async def test_search_compliance_and_legal_results_merged(
+        self, local_rag, legal_rag, compliance_docs, legal_docs
+    ):
+        """合规和法务源的结果应合并排序"""
+        await local_rag.ingest(compliance_docs)
+        await legal_rag.ingest(legal_docs)
+
+        retriever = MultiSourceRetriever(
+            sources={"合规文档库": local_rag, "法务知识库": legal_rag}
+        )
+
+        results = await retriever.search(
+            "合规 法务", top_k=10, sources=["合规文档库", "法务知识库"]
+        )
+
+        # 应有来自两个源的结果
+        source_names = {r.source_name for r in results}
+        assert len(source_names) >= 1
+
+        # 结果应按 score 降序排列
+        for i in range(len(results) - 1):
+            assert results[i].score >= results[i + 1].score
+
+
+# ── MemoryRetriever 集成测试 ──────────────────────────────
+
+
+class TestMemoryRetrieverIntegration:
+    """MemoryRetriever 与 MultiSourceRetriever 集成测试"""
+
+    @pytest.mark.asyncio
+    async def test_retrieve_with_sources_parameter(
+        self, local_rag, legal_rag, compliance_docs, legal_docs
+    ):
+        """MemoryRetriever.retrieve(sources=...) 委托给 MultiSourceRetriever"""
+        await local_rag.ingest(compliance_docs)
+        await legal_rag.ingest(legal_docs)
+
+        retriever = MemoryRetriever(
+            knowledge_sources={"local:合规文档": local_rag, "法务知识库": legal_rag}
+        )
+
+        items = await retriever.retrieve(
+            "合规", top_k=5, sources=["local:合规文档"]
+        )
+
+        # 结果应为 MemoryItem 类型
+        for item in items:
+            assert hasattr(item, "key")
+            assert hasattr(item, "value")
+            assert hasattr(item, "score")
+            assert hasattr(item, "metadata")
+
+    @pytest.mark.asyncio
+    async def test_retrieve_without_sources_keeps_current_behavior(
+        self, local_rag, compliance_docs
+    ):
+        """不指定 sources 时保持原有行为（三层记忆检索）"""
+        await local_rag.ingest(compliance_docs)
+
+        retriever = MemoryRetriever(
+            knowledge_sources={"local:合规文档": local_rag}
+        )
+
+        # 不指定 sources → 走三层记忆路径
+        items = await retriever.retrieve("合规", top_k=5)
+        # 三层记忆为空，应返回空结果
+        assert isinstance(items, list)
+
+    @pytest.mark.asyncio
+    async def test_retrieve_from_sources_with_source_tracing(
+        self, local_rag, legal_rag, compliance_docs, legal_docs
+    ):
+        """通过 MemoryRetriever 多源检索时，结果包含来源追溯"""
+        await local_rag.ingest(compliance_docs)
+        await legal_rag.ingest(legal_docs)
+
+        retriever = MemoryRetriever(
+            knowledge_sources={"local:合规文档": local_rag, "法务知识库": legal_rag}
+        )
+
+        items = await retriever.retrieve(
+            "合规", top_k=5, sources=["local:合规文档", "法务知识库"]
+        )
+
+        for item in items:
+            assert item.metadata.get("source") == "rag"
+            assert "source_name" in item.metadata
+            assert "document_title" in item.metadata
+
+    @pytest.mark.asyncio
+    async def test_multi_source_retriever_property(
+        self, local_rag, compliance_docs
+    ):
+        """通过 multi_source_retriever 属性直接访问"""
+        retriever = MemoryRetriever(
+            knowledge_sources={"local:合规文档": local_rag}
+        )
+
+        ms_retriever = retriever.multi_source_retriever
+        assert isinstance(ms_retriever, MultiSourceRetriever)
+        assert "local:合规文档" in ms_retriever.get_source_names()
+
+    @pytest.mark.asyncio
+    async def test_register_source_via_property(
+        self, local_rag, legal_rag, compliance_docs, legal_docs
+    ):
+        """通过 multi_source_retriever 属性动态注册源"""
+        await local_rag.ingest(compliance_docs)
+        await legal_rag.ingest(legal_docs)
+
+        retriever = MemoryRetriever(
+            knowledge_sources={"local:合规文档": local_rag}
+        )
+
+        # 动态注册法务知识库
+        retriever.multi_source_retriever.register_source("法务知识库", legal_rag)
+
+        # 现在可以从法务知识库检索
+        items = await retriever.retrieve(
+            "合同", top_k=5, sources=["法务知识库"]
+        )
+
+        for item in items:
+            assert item.metadata.get("source_name") == "法务知识库"
+
+    @pytest.mark.asyncio
+    async def test_retrieve_with_source_weights(
+        self, local_rag, legal_rag, compliance_docs, legal_docs
+    ):
+        """MemoryRetriever 支持 source_weights 参数"""
+        await local_rag.ingest(compliance_docs)
+        await legal_rag.ingest(legal_docs)
+
+        retriever = MemoryRetriever(
+            knowledge_sources={"local:合规文档": local_rag, "法务知识库": legal_rag}
+        )
+
+        items = await retriever.retrieve(
+            "合规",
+            top_k=5,
+            sources=["local:合规文档", "法务知识库"],
+            source_weights={"local:合规文档": 1.5},
+        )
+
+        assert isinstance(items, list)
+
+
+# ── 边界情况测试 ──────────────────────────────────────────
+
+
+class TestEdgeCases:
+    """边界情况测试"""
+
+    @pytest.mark.asyncio
+    async def test_search_with_empty_source_list(self, local_rag, compliance_docs):
+        """sources=[] 空列表 → 不查询任何源，返回空"""
+        await local_rag.ingest(compliance_docs)
+
+        retriever = MultiSourceRetriever(sources={"local:合规文档": local_rag})
+
+        results = await retriever.search("合规", top_k=5, sources=[])
+        assert len(results) == 0
+
+    @pytest.mark.asyncio
+    async def test_search_top_k_limits_results(
+        self, local_rag, legal_rag, compliance_docs, legal_docs
+    ):
+        """top_k 限制返回结果数量"""
+        await local_rag.ingest(compliance_docs)
+        await legal_rag.ingest(legal_docs)
+
+        retriever = MultiSourceRetriever(
+            sources={"local:合规文档": local_rag, "法务知识库": legal_rag}
+        )
+
+        results = await retriever.search("合规", top_k=1)
+        assert len(results) <= 1
+
+    @pytest.mark.asyncio
+    async def test_source_query_failure_graceful(
+        self, local_rag, compliance_docs
+    ):
+        """某个源查询失败时，其他源结果正常返回"""
+        await local_rag.ingest(compliance_docs)
+
+        # 创建一个会抛异常的 mock 源
+        class FailingSource:
+            async def ingest(self, documents):
+                return []
+
+            async def query(self, text, top_k=5):
+                raise ConnectionError("Service unavailable")
+
+            async def delete_by_id(self, id):
+                return False
+
+            async def list_sources(self):
+                return [SourceInfo(source_id="failing", source_name="Failing", source_type="mock")]
+
+            async def health_check(self):
+                return False
+
+        retriever = MultiSourceRetriever(
+            sources={"local:合规文档": local_rag, "failing_source": FailingSource()}
+        )
+
+        # 应不抛异常，返回合规文档库的结果
+        results = await retriever.search("合规", top_k=5)
+        assert isinstance(results, list)
+
+    @pytest.mark.asyncio
+    async def test_search_results_sorted_by_score(
+        self, local_rag, legal_rag, compliance_docs, legal_docs
+    ):
+        """结果按 score 降序排列"""
+        await local_rag.ingest(compliance_docs)
+        await legal_rag.ingest(legal_docs)
+
+        retriever = MultiSourceRetriever(
+            sources={"local:合规文档": local_rag, "法务知识库": legal_rag}
+        )
+
+        results = await retriever.search("合规 法务", top_k=10)
+
+        for i in range(len(results) - 1):
+            assert results[i].score >= results[i + 1].score