diff --git a/src/agentkit/bitable/db.py b/src/agentkit/bitable/db.py
index a24445d..e5d00ee 100644
--- a/src/agentkit/bitable/db.py
+++ b/src/agentkit/bitable/db.py
@@ -18,7 +18,7 @@ import logging
 import os
 import uuid as _uuid
 from datetime import datetime, timezone
-from typing import Any
+from types import TracebackType
 
 from sqlalchemy import (
     Column,
@@ -191,7 +191,7 @@ class MetaModel(BitableBase):
 # ---------------------------------------------------------------------------
 
 
-async def _apply_v2_migration(conn: Any) -> None:
+async def _apply_v2_migration(conn: object) -> None:
     """V2 migration: create ``bitable_files`` table + add ``file_id`` to tables.
 
     Idempotent — safe to call on fresh installs (``create_all`` already made
@@ -265,8 +265,8 @@ class BitableDB:
 
     def __init__(self, database_url: str | None = None) -> None:
         self._database_url = database_url or _resolve_database_url()
-        self._engine: Any = None
-        self._session_factory: Any = None
+        self._engine: object | None = None
+        self._session_factory: object | None = None
         self._initialized = False
         self._init_lock = asyncio.Lock()
 
@@ -275,11 +275,11 @@ class BitableDB:
         return self._database_url
 
     @property
-    def engine(self) -> Any:
+    def engine(self) -> object | None:
         return self._engine
 
     @property
-    def session_factory(self) -> Any:
+    def session_factory(self) -> object | None:
         return self._session_factory
 
     @property
@@ -365,7 +365,12 @@ class BitableDB:
         await self.init()
         return self
 
-    async def __aexit__(self, exc_type: Any, exc_val: Any, exc_tb: Any) -> None:
+    async def __aexit__(
+        self,
+        exc_type: type[BaseException] | None,
+        exc_val: BaseException | None,
+        exc_tb: TracebackType | None,
+    ) -> None:
         await self.close()
 
 
diff --git a/src/agentkit/bitable/formula/functions.py b/src/agentkit/bitable/formula/functions.py
index b06b435..05009e7 100644
--- a/src/agentkit/bitable/formula/functions.py
+++ b/src/agentkit/bitable/formula/functions.py
@@ -12,12 +12,17 @@ based on the calling context — see :mod:`agentkit.bitable.formula.engine`.
 
 from __future__ import annotations
 
-from typing import Any, Callable
+from typing import Callable, TypeAlias
+
+# A formula evaluates to a scalar primitive: text, number, or nothing.
+# bool is intentionally excluded — comparisons live in the parser layer
+# and never reach the function registry.
+FormulaResult: TypeAlias = str | int | float | None
 
 # ── Aggregate functions (operate on lists) ────────────────
 
 
-def _sum(values: list[Any]) -> float | int:
+def _sum(values: list[FormulaResult]) -> float | int:
     """Sum of numeric values, ignoring None/empty."""
     total = 0
     for v in values:
@@ -27,7 +32,7 @@ def _sum(values: list[Any]) -> float | int:
     return total
 
 
-def _avg(values: list[Any]) -> float:
+def _avg(values: list[FormulaResult]) -> float:
     """Average of numeric values, ignoring None/empty."""
     nums = [v for v in values if v is not None and v != ""]
     if not nums:
@@ -35,12 +40,12 @@ def _avg(values: list[Any]) -> float:
     return sum(nums) / len(nums)
 
 
-def _count(values: list[Any]) -> int:
+def _count(values: list[FormulaResult]) -> int:
     """Count of non-empty values."""
     return sum(1 for v in values if v is not None and v != "")
 
 
-def _min(values: list[Any]) -> Any:
+def _min(values: list[FormulaResult]) -> FormulaResult:
     """Minimum of numeric values, ignoring None/empty."""
     nums = [v for v in values if v is not None and v != ""]
     if not nums:
@@ -48,7 +53,7 @@ def _min(values: list[Any]) -> Any:
     return min(nums)
 
 
-def _max(values: list[Any]) -> Any:
+def _max(values: list[FormulaResult]) -> FormulaResult:
     """Maximum of numeric values, ignoring None/empty."""
     nums = [v for v in values if v is not None and v != ""]
     if not nums:
@@ -59,25 +64,29 @@ def _max(values: list[Any]) -> Any:
 # ── Scalar functions ──────────────────────────────────────
 
 
-def _abs(value: Any) -> Any:
+def _abs(value: FormulaResult) -> FormulaResult:
     return abs(value)
 
 
-def _round(value: Any, digits: int = 0) -> float:
+def _round(value: FormulaResult, digits: int = 0) -> float:
     return round(value, digits)
 
 
-def _if(condition: Any, true_val: Any, false_val: Any = None) -> Any:
+def _if(
+    condition: FormulaResult,
+    true_val: FormulaResult,
+    false_val: FormulaResult = None,
+) -> FormulaResult:
     return true_val if condition else false_val
 
 
-def _len(value: Any) -> int:
+def _len(value: FormulaResult) -> int:
     if value is None:
         return 0
     return len(str(value))
 
 
-def _concat(*args: Any) -> str:
+def _concat(*args: FormulaResult) -> str:
     """Concatenate all arguments as strings."""
     return "".join(str(a) for a in args if a is not None)
 
@@ -87,7 +96,7 @@ def _concat(*args: Any) -> str:
 # Functions that aggregate a column (receive a list of all column values)
 AGGREGATE_FUNCTIONS: frozenset[str] = frozenset({"SUM", "AVG", "COUNT", "MIN", "MAX"})
 
-FUNCTION_REGISTRY: dict[str, Callable[..., Any]] = {
+FUNCTION_REGISTRY: dict[str, Callable[..., FormulaResult]] = {
     "SUM": _sum,
     "AVG": _avg,
     "COUNT": _count,
diff --git a/src/agentkit/bitable/formula/parser.py b/src/agentkit/bitable/formula/parser.py
index 5f92785..e404e3b 100644
--- a/src/agentkit/bitable/formula/parser.py
+++ b/src/agentkit/bitable/formula/parser.py
@@ -25,9 +25,9 @@ from __future__ import annotations
 
 import ast
 import re
-from typing import Any
+from typing import Callable
 
-from agentkit.bitable.formula.functions import FUNCTION_REGISTRY
+from agentkit.bitable.formula.functions import FUNCTION_REGISTRY, FormulaResult
 
 # ── Exceptions ────────────────────────────────────────────
 
@@ -184,9 +184,9 @@ def parse_formula(
 
 def evaluate_ast(
     tree: ast.Expression,
-    field_values: dict[str, Any],
-    functions: dict[str, Any],
-) -> Any:
+    field_values: dict[str, FormulaResult | list[FormulaResult]],
+    functions: dict[str, Callable[..., FormulaResult]],
+) -> FormulaResult:
     """Evaluate a parsed formula AST against field values and functions.
 
     This is NOT ``eval()`` — it's a manual AST walker that only processes
@@ -204,7 +204,11 @@ def evaluate_ast(
     return _eval_node(tree.body, field_values, functions)
 
 
-def _eval_node(node: ast.AST, fields: dict[str, Any], functions: dict[str, Any]) -> Any:
+def _eval_node(
+    node: ast.AST,
+    fields: dict[str, FormulaResult | list[FormulaResult]],
+    functions: dict[str, Callable[..., FormulaResult]],
+) -> FormulaResult:
     """Recursively evaluate an AST node."""
     if isinstance(node, ast.Constant):
         return node.value
@@ -274,7 +278,7 @@ def _eval_node(node: ast.AST, fields: dict[str, Any], functions: dict[str, Any])
     raise FormulaSecurityError(f"Disallowed node during evaluation: {type(node).__name__}")
 
 
-def _apply_binop(op: ast.AST, left: Any, right: Any) -> Any:
+def _apply_binop(op: ast.AST, left: FormulaResult, right: FormulaResult) -> FormulaResult:
     """Apply a binary operator."""
     if isinstance(op, ast.Add):
         # String concat or numeric addition
@@ -294,7 +298,7 @@ def _apply_binop(op: ast.AST, left: Any, right: Any) -> Any:
     raise FormulaSecurityError(f"Disallowed binary op: {type(op).__name__}")
 
 
-def _apply_compare(op: ast.AST, left: Any, right: Any) -> bool:
+def _apply_compare(op: ast.AST, left: FormulaResult, right: FormulaResult) -> bool:
     """Apply a comparison operator."""
     if isinstance(op, ast.Eq):
         return left == right
diff --git a/src/agentkit/bitable/service.py b/src/agentkit/bitable/service.py
index a236ea5..84ab40e 100644
--- a/src/agentkit/bitable/service.py
+++ b/src/agentkit/bitable/service.py
@@ -12,7 +12,7 @@ import logging
 import os
 from datetime import datetime, timezone
 from pathlib import Path
-from typing import Any
+from typing import TYPE_CHECKING, TypeAlias
 
 from agentkit.bitable.db import BitableDB
 from agentkit.bitable.models import (
@@ -29,13 +29,27 @@ from agentkit.bitable.models import (
 )
 from agentkit.bitable.repository import BitableRepository
 
+if TYPE_CHECKING:
+    from typing import Protocol
+
+    class _RecalcWorker(Protocol):
+        """Structural type for the recalc worker's cache-invalidation surface."""
+
+        def invalidate_engine(self, table_id: str) -> None: ...
+
+
 logger = logging.getLogger(__name__)
 
+# Record values are JSON scalars (text/number/none). Attachment/image fields
+# store lists of dicts at runtime, but the common-case scalar shape is captured
+# here for annotation clarity; fall back to dict[str, object] where lists occur.
+BitableRecord: TypeAlias = dict[str, str | int | float | None]
+
 
 class FieldDependencyError(Exception):
     """Raised when deleting a field that has dependencies (formula refs, PK, views)."""
 
-    def __init__(self, message: str, dependencies: dict[str, Any]) -> None:
+    def __init__(self, message: str, dependencies: dict[str, object]) -> None:
         super().__init__(message)
         self.dependencies = dependencies
 
@@ -52,13 +66,13 @@ class BitableService:
     def __init__(self, db: BitableDB) -> None:
         self._db = db
         self._repo = BitableRepository(db)
-        self._recalc_worker: Any = None  # RecalcWorker, set via set_recalc_worker
+        self._recalc_worker: _RecalcWorker | None = None  # set via set_recalc_worker
 
     @property
     def repo(self) -> BitableRepository:
         return self._repo
 
-    def set_recalc_worker(self, worker: Any) -> None:
+    def set_recalc_worker(self, worker: _RecalcWorker) -> None:
         """Register the long-lived RecalcWorker so field changes can invalidate its engine cache.
 
         Called after both service and worker are constructed (breaks the
@@ -95,7 +109,7 @@ class BitableService:
     async def list_files(self, owner_user_id: str | None = None) -> list[BitableFile]:
         return await self._repo.list_files(owner_user_id=owner_user_id)
 
-    async def update_file(self, file_id: str, **kwargs: Any) -> BitableFile | None:
+    async def update_file(self, file_id: str, **kwargs: object) -> BitableFile | None:
         return await self._repo.update_file(file_id, **kwargs)
 
     async def delete_file(self, file_id: str) -> bool:
@@ -162,7 +176,7 @@ class BitableService:
     async def list_tables(self, owner_user_id: str | None = None) -> list[Table]:
         return await self._repo.list_tables(owner_user_id=owner_user_id)
 
-    async def update_table(self, table_id: str, **kwargs: Any) -> Table | None:
+    async def update_table(self, table_id: str, **kwargs: object) -> Table | None:
         """Update table attrs. Creates PK unique index if primary_key_field_id is set."""
         table = await self._repo.update_table(table_id, **kwargs)
         if table and kwargs.get("primary_key_field_id"):
@@ -179,7 +193,7 @@ class BitableService:
         table_id: str,
         name: str,
         field_type: FieldType,
-        config: dict[str, Any] | None = None,
+        config: dict[str, object] | None = None,
         owner: FieldOwner = FieldOwner.user,
     ) -> Field:
         """Create a new field. U2 will add formula validation and DAG updates."""
@@ -201,7 +215,7 @@ class BitableService:
     async def list_fields(self, table_id: str) -> list[Field]:
         return await self._repo.list_fields(table_id)
 
-    async def update_field(self, field_id: str, **kwargs: Any) -> Field | None:
+    async def update_field(self, field_id: str, **kwargs: object) -> Field | None:
         """Update a field. U2 will add dependency checking."""
         field = await self._repo.update_field(field_id, **kwargs)
         if field is not None:
@@ -220,7 +234,7 @@ class BitableService:
             return False
 
         # Check dependencies
-        deps: dict[str, Any] = {}
+        deps: dict[str, object] = {}
 
         # 1. Is it a primary key field?
         table = await self._repo.get_table(field.table_id)
@@ -264,7 +278,7 @@ class BitableService:
     async def create_record(
         self,
         table_id: str,
-        values: dict[str, Any] | None = None,
+        values: BitableRecord | None = None,
         actor_user_id: str | None = None,
     ) -> Record:
         """Create a new record. Triggers recalc for affected formula fields.
@@ -291,7 +305,7 @@ class BitableService:
         return record
 
     async def create_records_batch(
-        self, table_id: str, records_values: list[dict[str, Any]]
+        self, table_id: str, records_values: list[BitableRecord]
     ) -> list[Record]:
         """Batch-create records (P2 #19). Triggers recalc for each record.
 
@@ -319,8 +333,8 @@ class BitableService:
     async def list_records_filtered(
         self,
         table_id: str,
-        filters: list[dict[str, Any]] | None = None,
-        sorts: list[dict[str, Any]] | None = None,
+        filters: list[dict[str, object]] | None = None,
+        sorts: list[dict[str, object]] | None = None,
         cursor: str | None = None,
         limit: int = 50,
     ) -> tuple[list[Record], str | None]:
@@ -345,7 +359,7 @@ class BitableService:
             table_id, filters=filters, sorts=sorts, cursor=cursor, limit=limit
         )
 
-    async def update_record_values(self, record_id: str, values: dict[str, Any]) -> Record | None:
+    async def update_record_values(self, record_id: str, values: BitableRecord) -> Record | None:
         """Update a record's values (full replace). Triggers recalc for affected formulas."""
         record = await self._repo.update_record_values(record_id, values)
         if record is not None:
@@ -431,9 +445,9 @@ class BitableService:
     async def upsert_records(
         self,
         table_id: str,
-        records: list[dict[str, Any]],
+        records: list[BitableRecord],
         primary_key_field_id: str,
-    ) -> dict[str, Any]:
+    ) -> dict[str, int]:
         """Upsert records by primary key using jsonb_set (KTD8).
 
         For each record:
@@ -454,12 +468,12 @@ class BitableService:
         agent_field_ids = {f.id for f in fields if f.owner == FieldOwner.agent}
 
         # Partition records into insert vs update lists, collecting PK values.
-        to_insert: list[dict[str, Any]] = []
-        to_update: list[tuple[dict[str, Any], str]] = []  # (values, existing_record_id)
+        to_insert: list[BitableRecord] = []
+        to_update: list[tuple[BitableRecord, str]] = []  # (values, existing_record_id)
         skipped = 0
 
         # Collect all non-None PK values for batch lookup.
-        pk_values_by_str: dict[str, dict[str, Any]] = {}
+        pk_values_by_str: dict[str, BitableRecord] = {}
         for rec_values in records:
             pk_value = rec_values.get(primary_key_field_id)
             if pk_value is None:
@@ -504,7 +518,7 @@ class BitableService:
         table_id: str,
         name: str,
         view_type: ViewType = ViewType.grid,
-        config: dict[str, Any] | None = None,
+        config: dict[str, object] | None = None,
     ) -> View:
         return await self._repo.create_view(
             table_id=table_id,
@@ -516,7 +530,7 @@ class BitableService:
     async def list_views(self, table_id: str) -> list[View]:
         return await self._repo.list_views(table_id)
 
-    async def update_view(self, view_id: str, **kwargs: Any) -> View | None:
+    async def update_view(self, view_id: str, **kwargs: object) -> View | None:
         return await self._repo.update_view(view_id, **kwargs)
 
     async def get_view(self, view_id: str) -> View | None:
diff --git a/src/agentkit/orchestrator/pipeline_state.py b/src/agentkit/orchestrator/pipeline_state.py
index a176d5a..1acc9c8 100644
--- a/src/agentkit/orchestrator/pipeline_state.py
+++ b/src/agentkit/orchestrator/pipeline_state.py
@@ -32,14 +32,14 @@ class PipelineStateMemory:
     """In-memory pipeline state storage (testing / fallback)."""
 
     def __init__(self) -> None:
-        self._executions: dict[str, dict[str, Any]] = {}
-        self._step_history: dict[str, list[dict[str, Any]]] = {}
+        self._executions: dict[str, dict[str, object]] = {}
+        self._step_history: dict[str, list[dict[str, object]]] = {}
 
     async def create_execution(
         self,
         pipeline_name: str,
         steps: list[str],
-        input_data: dict[str, Any] | None = None,
+        input_data: dict[str, object] | None = None,
         tenant_id: str | None = None,
     ) -> str:
         execution_id = str(uuid.uuid4())
@@ -67,7 +67,7 @@ class PipelineStateMemory:
         execution_id: str,
         step_name: str,
         status: str,
-        output: dict[str, Any] | None = None,
+        output: dict[str, object] | None = None,
         error: str | None = None,
         duration_ms: int | None = None,
     ) -> None:
@@ -88,7 +88,7 @@ class PipelineStateMemory:
             exec_state["error_message"] = error
 
         # Record step history event
-        step_event: dict[str, Any] = {
+        step_event: dict[str, object] = {
             "id": str(uuid.uuid4()),
             "execution_id": execution_id,
             "step_name": step_name,
@@ -97,14 +97,16 @@ class PipelineStateMemory:
             "error_message": error,
             "duration_ms": duration_ms,
             "started_at": datetime.now(timezone.utc).isoformat(),
-            "completed_at": datetime.now(timezone.utc).isoformat() if status in ("completed", "failed") else None,
+            "completed_at": datetime.now(timezone.utc).isoformat()
+            if status in ("completed", "failed")
+            else None,
         }
         self._step_history[execution_id].append(step_event)
 
     async def complete_execution(
         self,
         execution_id: str,
-        final_output: dict[str, Any] | None = None,
+        final_output: dict[str, object] | None = None,
     ) -> None:
         exec_state = self._executions.get(execution_id)
         if exec_state is None:
@@ -130,7 +132,7 @@ class PipelineStateMemory:
         exec_state["updated_at"] = now
         exec_state["completed_at"] = now
 
-    async def get_execution(self, execution_id: str) -> dict[str, Any] | None:
+    async def get_execution(self, execution_id: str) -> dict[str, object] | None:
         return self._executions.get(execution_id)
 
     async def list_executions(
@@ -138,17 +140,17 @@ class PipelineStateMemory:
         status: str | None = None,
         limit: int = 50,
         offset: int = 0,
-    ) -> list[dict[str, Any]]:
+    ) -> list[dict[str, object]]:
         results = list(self._executions.values())
         if status:
             results = [e for e in results if e.get("status") == status]
         results.sort(key=lambda e: e.get("created_at", ""), reverse=True)
         return results[offset : offset + limit]
 
-    async def get_step_history(self, execution_id: str) -> list[dict[str, Any]]:
+    async def get_step_history(self, execution_id: str) -> list[dict[str, object]]:
         return self._step_history.get(execution_id, [])
 
-    def get_execution_sync(self, execution_id: str) -> dict[str, Any] | None:
+    def get_execution_sync(self, execution_id: str) -> dict[str, object] | None:
         """Synchronous accessor for execution state (used by Redis dual-write)."""
         return self._executions.get(execution_id)
 
@@ -165,7 +167,7 @@ class PipelineStateRedis:
 
     def __init__(self, redis_url: str = "redis://localhost:6379/0") -> None:
         self._redis_url = redis_url
-        self._redis: Any = None
+        self._redis: object | None = None
         self._fallback = PipelineStateMemory()
         self._use_fallback = False
         self._fallback_since: float | None = None
@@ -181,8 +183,8 @@ class PipelineStateRedis:
         return self._redis
 
     async def _safe_redis_call(
-        self, fn: Callable[..., Coroutine[Any, Any, Any]], *args: Any, **kwargs: Any
-    ) -> Any:
+        self, fn: Callable[..., Coroutine[Any, Any, Any]], *args: object, **kwargs: object
+    ) -> object | None:
         """Execute a Redis call, falling back to memory on failure.
 
         After falling back, periodically retries Redis to enable recovery.
@@ -192,6 +194,7 @@ class PipelineStateRedis:
             # Check if enough time has passed to attempt recovery
             if self._fallback_since is not None:
                 import time as _time
+
                 elapsed = _time.monotonic() - self._fallback_since
                 if elapsed >= self._RECOVERY_COOLDOWN_SECONDS:
                     try:
@@ -218,6 +221,7 @@ class PipelineStateRedis:
             logger.warning(f"Redis operation failed, switching to memory fallback: {exc}")
             self._use_fallback = True
             import time as _time
+
             self._fallback_since = _time.monotonic()
             self._redis = None
             return None
@@ -229,7 +233,7 @@ class PipelineStateRedis:
         self,
         pipeline_name: str,
         steps: list[str],
-        input_data: dict[str, Any] | None = None,
+        input_data: dict[str, object] | None = None,
         tenant_id: str | None = None,
     ) -> str:
         # Always write to fallback first for consistency
@@ -238,7 +242,7 @@ class PipelineStateRedis:
         )
 
         # Try Redis
-        async def _redis_create(redis: Any) -> None:
+        async def _redis_create(redis: object) -> None:
             state = self._fallback.get_execution_sync(execution_id)
             score = datetime.now(timezone.utc).timestamp()
             pipe = redis.pipeline()
@@ -254,13 +258,15 @@ class PipelineStateRedis:
         execution_id: str,
         step_name: str,
         status: str,
-        output: dict[str, Any] | None = None,
+        output: dict[str, object] | None = None,
         error: str | None = None,
         duration_ms: int | None = None,
     ) -> None:
-        await self._fallback.update_step(execution_id, step_name, status, output, error, duration_ms)
+        await self._fallback.update_step(
+            execution_id, step_name, status, output, error, duration_ms
+        )
 
-        async def _redis_update(redis: Any) -> None:
+        async def _redis_update(redis: object) -> None:
             state = self._fallback.get_execution_sync(execution_id)
             if state is None:
                 return
@@ -271,11 +277,11 @@ class PipelineStateRedis:
     async def complete_execution(
         self,
         execution_id: str,
-        final_output: dict[str, Any] | None = None,
+        final_output: dict[str, object] | None = None,
     ) -> None:
         await self._fallback.complete_execution(execution_id, final_output)
 
-        async def _redis_complete(redis: Any) -> None:
+        async def _redis_complete(redis: object) -> None:
             state = self._fallback.get_execution_sync(execution_id)
             if state is None:
                 return
@@ -291,7 +297,7 @@ class PipelineStateRedis:
     ) -> None:
         await self._fallback.fail_execution(execution_id, step_name, error)
 
-        async def _redis_fail(redis: Any) -> None:
+        async def _redis_fail(redis: object) -> None:
             state = self._fallback.get_execution_sync(execution_id)
             if state is None:
                 return
@@ -299,7 +305,7 @@ class PipelineStateRedis:
 
         await self._safe_redis_call(_redis_fail)
 
-    async def get_execution(self, execution_id: str) -> dict[str, Any] | None:
+    async def get_execution(self, execution_id: str) -> dict[str, object] | None:
         # Try Redis first
         if not self._use_fallback:
             try:
@@ -318,7 +324,7 @@ class PipelineStateRedis:
         status: str | None = None,
         limit: int = 50,
         offset: int = 0,
-    ) -> list[dict[str, Any]]:
+    ) -> list[dict[str, object]]:
         # Try Redis sorted set for efficient listing
         if not self._use_fallback:
             try:
@@ -341,7 +347,7 @@ class PipelineStateRedis:
 
         return await self._fallback.list_executions(status, limit, offset)
 
-    async def get_step_history(self, execution_id: str) -> list[dict[str, Any]]:
+    async def get_step_history(self, execution_id: str) -> list[dict[str, object]]:
         return await self._fallback.get_step_history(execution_id)
 
     async def health_check(self) -> bool:
@@ -364,20 +370,18 @@ class PipelineStatePG:
     If session_factory is None, all methods are no-op.
     """
 
-    def __init__(self, session_factory: Any = None) -> None:
+    def __init__(self, session_factory: object | None = None) -> None:
         self._session_factory = session_factory
 
     @property
     def enabled(self) -> bool:
         return self._session_factory is not None
 
-    async def persist_execution(self, state: dict[str, Any]) -> None:
+    async def persist_execution(self, state: dict[str, object]) -> None:
         """Write a completed/failed execution to PostgreSQL."""
         if not self.enabled:
             return
         try:
-            from sqlalchemy.ext.asyncio import AsyncSession
-
             async with self._session_factory() as session:
                 model = PipelineExecutionModel(
                     id=state["id"],
@@ -390,18 +394,22 @@ class PipelineStatePG:
                     final_output=state.get("final_output"),
                     error_message=state.get("error_message"),
                     tenant_id=state.get("tenant_id"),
-                    created_at=datetime.fromisoformat(state["created_at"]) if state.get("created_at") else None,
-                    updated_at=datetime.fromisoformat(state["updated_at"]) if state.get("updated_at") else None,
-                    completed_at=datetime.fromisoformat(state["completed_at"]) if state.get("completed_at") else None,
+                    created_at=datetime.fromisoformat(state["created_at"])
+                    if state.get("created_at")
+                    else None,
+                    updated_at=datetime.fromisoformat(state["updated_at"])
+                    if state.get("updated_at")
+                    else None,
+                    completed_at=datetime.fromisoformat(state["completed_at"])
+                    if state.get("completed_at")
+                    else None,
                 )
                 await session.merge(model)
                 await session.commit()
         except Exception as exc:
             logger.error(f"Failed to persist execution to PG: {exc}")
 
-    async def persist_step_history(
-        self, execution_id: str, steps: list[dict[str, Any]]
-    ) -> None:
+    async def persist_step_history(self, execution_id: str, steps: list[dict[str, object]]) -> None:
         """Write step history to PostgreSQL."""
         if not self.enabled:
             return
@@ -419,8 +427,12 @@ class PipelineStatePG:
                         error_message=step.get("error_message"),
                         duration_ms=step.get("duration_ms"),
                         retry_attempt=step.get("retry_attempt", 0),
-                        started_at=datetime.fromisoformat(step["started_at"]) if step.get("started_at") else None,
-                        completed_at=datetime.fromisoformat(step["completed_at"]) if step.get("completed_at") else None,
+                        started_at=datetime.fromisoformat(step["started_at"])
+                        if step.get("started_at")
+                        else None,
+                        completed_at=datetime.fromisoformat(step["completed_at"])
+                        if step.get("completed_at")
+                        else None,
                     )
                     await session.merge(model)
                 await session.commit()
@@ -433,7 +445,7 @@ class PipelineStatePG:
         status: str | None = None,
         limit: int = 50,
         offset: int = 0,
-    ) -> list[dict[str, Any]]:
+    ) -> list[dict[str, object]]:
         """Query historical executions from PostgreSQL."""
         if not self.enabled:
             return []
@@ -445,9 +457,7 @@ class PipelineStatePG:
                     PipelineExecutionModel.created_at.desc()
                 )
                 if pipeline_name:
-                    stmt = stmt.where(
-                        PipelineExecutionModel.pipeline_name == pipeline_name
-                    )
+                    stmt = stmt.where(PipelineExecutionModel.pipeline_name == pipeline_name)
                 if status:
                     stmt = stmt.where(PipelineExecutionModel.status == status)
                 stmt = stmt.offset(offset).limit(limit)
@@ -458,7 +468,7 @@ class PipelineStatePG:
             logger.error(f"Failed to query executions from PG: {exc}")
             return []
 
-    async def get_execution(self, execution_id: str) -> dict[str, Any] | None:
+    async def get_execution(self, execution_id: str) -> dict[str, object] | None:
         """Get a single execution from PostgreSQL (for Redis miss fallback)."""
         if not self.enabled:
             return None
@@ -479,7 +489,7 @@ class PipelineStatePG:
             return None
 
     @staticmethod
-    def _model_to_dict(model: PipelineExecutionModel) -> dict[str, Any]:
+    def _model_to_dict(model: PipelineExecutionModel) -> dict[str, object]:
         return {
             "id": model.id,
             "pipeline_name": model.pipeline_name,
@@ -509,7 +519,7 @@ class PipelineStateManager:
     def __init__(
         self,
         redis_url: str | None = None,
-        session_factory: Any = None,
+        session_factory: object | None = None,
     ) -> None:
         if redis_url:
             self._hot = PipelineStateRedis(redis_url=redis_url)
@@ -529,7 +539,7 @@ class PipelineStateManager:
         self,
         pipeline_name: str,
         steps: list[str],
-        input_data: dict[str, Any] | None = None,
+        input_data: dict[str, object] | None = None,
         tenant_id: str | None = None,
     ) -> str:
         return await self._hot.create_execution(pipeline_name, steps, input_data, tenant_id)
@@ -539,7 +549,7 @@ class PipelineStateManager:
         execution_id: str,
         step_name: str,
         status: str,
-        output: dict[str, Any] | None = None,
+        output: dict[str, object] | None = None,
         error: str | None = None,
         duration_ms: int | None = None,
     ) -> None:
@@ -548,7 +558,7 @@ class PipelineStateManager:
     async def complete_execution(
         self,
         execution_id: str,
-        final_output: dict[str, Any] | None = None,
+        final_output: dict[str, object] | None = None,
     ) -> None:
         await self._hot.complete_execution(execution_id, final_output)
         # Persist to PG
@@ -574,7 +584,7 @@ class PipelineStateManager:
             if step_history:
                 await self._cold.persist_step_history(execution_id, step_history)
 
-    async def get_execution(self, execution_id: str) -> dict[str, Any] | None:
+    async def get_execution(self, execution_id: str) -> dict[str, object] | None:
         # Redis / memory first
         state = await self._hot.get_execution(execution_id)
         if state is not None:
@@ -587,7 +597,7 @@ class PipelineStateManager:
         status: str | None = None,
         limit: int = 50,
         offset: int = 0,
-    ) -> list[dict[str, Any]]:
+    ) -> list[dict[str, object]]:
         # Hot store for recent executions
         results = await self._hot.list_executions(status, limit, offset)
         if results:
@@ -595,7 +605,7 @@ class PipelineStateManager:
         # Cold store for historical queries
         return await self._cold.query_executions(status=status, limit=limit, offset=offset)
 
-    async def get_step_history(self, execution_id: str) -> list[dict[str, Any]]:
+    async def get_step_history(self, execution_id: str) -> list[dict[str, object]]:
         return await self._hot.get_step_history(execution_id)
 
     async def health_check(self) -> dict[str, bool]:
diff --git a/src/agentkit/tools/computer_use_session.py b/src/agentkit/tools/computer_use_session.py
index cfad758..492faf8 100644
--- a/src/agentkit/tools/computer_use_session.py
+++ b/src/agentkit/tools/computer_use_session.py
@@ -15,10 +15,14 @@ import time
 import uuid
 from abc import ABC, abstractmethod
 from dataclasses import dataclass, field
-from typing import Any
+from typing import TypeAlias
 
 logger = logging.getLogger(__name__)
 
+# Scalar session state values (text/number/flag/none). Screen-state dicts use
+# dict[str, object] because they also hold tuple cursor positions.
+SessionState: TypeAlias = dict[str, str | int | bool | None]
+
 
 @dataclass
 class ScreenInfo:
@@ -37,7 +41,7 @@ class ActionResult:
     output: str = ""
     screenshot_base64: str = ""
     error: str = ""
-    metadata: dict[str, Any] = field(default_factory=dict)
+    metadata: dict[str, object] = field(default_factory=dict)
 
 
 class ComputerUseSession(ABC):
@@ -56,7 +60,7 @@ class ComputerUseSession(ABC):
         self.session_id = session_id or str(uuid.uuid4())
         self.screen = ScreenInfo(width=screen_width, height=screen_height)
         self._started = False
-        self._action_history: list[dict[str, Any]] = []
+        self._action_history: list[dict[str, object]] = []
 
     @property
     def is_started(self) -> bool:
@@ -82,7 +86,7 @@ class ComputerUseSession(ABC):
         ...
 
     @abstractmethod
-    async def execute_action(self, action: str, **params: Any) -> ActionResult:
+    async def execute_action(self, action: str, **params: object) -> ActionResult:
         """执行 UI 操作
 
         Args:
@@ -94,18 +98,20 @@ class ComputerUseSession(ABC):
         """
         ...
 
-    def record_action(self, action: str, params: dict[str, Any], result: ActionResult) -> None:
+    def record_action(self, action: str, params: dict[str, object], result: ActionResult) -> None:
         """记录操作历史"""
-        self._action_history.append({
-            "timestamp": time.time(),
-            "action": action,
-            "params": params,
-            "success": result.success,
-            "output": result.output[:200] if result.output else "",
-        })
+        self._action_history.append(
+            {
+                "timestamp": time.time(),
+                "action": action,
+                "params": params,
+                "success": result.success,
+                "output": result.output[:200] if result.output else "",
+            }
+        )
 
     @property
-    def action_history(self) -> list[dict[str, Any]]:
+    def action_history(self) -> list[dict[str, object]]:
         """获取操作历史（副本）"""
         return list(self._action_history)
 
@@ -134,7 +140,7 @@ class InMemoryComputerUseSession(ComputerUseSession):
             screen_width=screen_width,
             screen_height=screen_height,
         )
-        self._screen_state: dict[str, Any] = {
+        self._screen_state: dict[str, object] = {
             "focused_element": None,
             "cursor_position": (0, 0),
             "typed_text": "",
@@ -173,7 +179,7 @@ class InMemoryComputerUseSession(ComputerUseSession):
             metadata={"screen_state": dict(self._screen_state)},
         )
 
-    async def execute_action(self, action: str, **params: Any) -> ActionResult:
+    async def execute_action(self, action: str, **params: object) -> ActionResult:
         """模拟执行 UI 操作"""
         if not self._started:
             return ActionResult(
@@ -186,7 +192,7 @@ class InMemoryComputerUseSession(ComputerUseSession):
         self.record_action(action, params, result)
         return result
 
-    def _simulate_action(self, action: str, **params: Any) -> ActionResult:
+    def _simulate_action(self, action: str, **params: object) -> ActionResult:
         """模拟具体操作"""
         if action == "click":
             x = params.get("x", 0)
@@ -270,18 +276,78 @@ class LocalComputerUseSession(ComputerUseSession):
             screen_width=screen_width,
             screen_height=screen_height,
         )
-        self._pyautogui: Any = None
+        self._pyautogui: object | None = None
 
     # Allowed keys for the `key` action — prevents OS-level shortcut abuse
     _ALLOWED_KEYS: set[str] = {
-        "enter", "return", "tab", "backspace", "delete", "home", "end",
-        "up", "down", "left", "right", "pageup", "pagedown",
-        "space", "escape", "insert",
-        "f1", "f2", "f3", "f4", "f5", "f6", "f7", "f8", "f9", "f10", "f11", "f12",
-        "shift", "ctrl", "alt", "command",
-        "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m",
-        "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z",
-        "0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
+        "enter",
+        "return",
+        "tab",
+        "backspace",
+        "delete",
+        "home",
+        "end",
+        "up",
+        "down",
+        "left",
+        "right",
+        "pageup",
+        "pagedown",
+        "space",
+        "escape",
+        "insert",
+        "f1",
+        "f2",
+        "f3",
+        "f4",
+        "f5",
+        "f6",
+        "f7",
+        "f8",
+        "f9",
+        "f10",
+        "f11",
+        "f12",
+        "shift",
+        "ctrl",
+        "alt",
+        "command",
+        "a",
+        "b",
+        "c",
+        "d",
+        "e",
+        "f",
+        "g",
+        "h",
+        "i",
+        "j",
+        "k",
+        "l",
+        "m",
+        "n",
+        "o",
+        "p",
+        "q",
+        "r",
+        "s",
+        "t",
+        "u",
+        "v",
+        "w",
+        "x",
+        "y",
+        "z",
+        "0",
+        "1",
+        "2",
+        "3",
+        "4",
+        "5",
+        "6",
+        "7",
+        "8",
+        "9",
     }
     _ALLOWED_BUTTONS: set[str] = {"left", "right", "middle"}
     _MAX_TEXT_LENGTH: int = 1000
@@ -291,6 +357,7 @@ class LocalComputerUseSession(ComputerUseSession):
         """启动本地桌面会话"""
         try:
             import pyautogui
+
             self._pyautogui = pyautogui
             pyautogui.FAILSAFE = True
             pyautogui.PAUSE = 0.1
@@ -327,7 +394,7 @@ class LocalComputerUseSession(ComputerUseSession):
         except Exception as e:
             return ActionResult(success=False, action="screenshot", error=str(e))
 
-    async def execute_action(self, action: str, **params: Any) -> ActionResult:
+    async def execute_action(self, action: str, **params: object) -> ActionResult:
         """在本地桌面执行 UI 操作"""
         if not self._started:
             return ActionResult(success=False, action=action, error="Session not started")
@@ -343,7 +410,7 @@ class LocalComputerUseSession(ComputerUseSession):
         """Check if coordinates are within screen bounds."""
         return 0 <= x <= self.screen_width and 0 <= y <= self.screen_height
 
-    async def _execute_local_action(self, action: str, **params: Any) -> ActionResult:
+    async def _execute_local_action(self, action: str, **params: object) -> ActionResult:
         """Execute a local UI action with input validation."""
         pg = self._pyautogui
 
@@ -351,16 +418,24 @@ class LocalComputerUseSession(ComputerUseSession):
             x, y = params.get("x", 0), params.get("y", 0)
             button = params.get("button", "left")
             if button not in self._ALLOWED_BUTTONS:
-                return ActionResult(success=False, action="click", error=f"Invalid button: {button}")
+                return ActionResult(
+                    success=False, action="click", error=f"Invalid button: {button}"
+                )
             if not self._validate_coordinates(x, y):
-                return ActionResult(success=False, action="click", error=f"Coordinates out of bounds: ({x}, {y})")
+                return ActionResult(
+                    success=False, action="click", error=f"Coordinates out of bounds: ({x}, {y})"
+                )
             pg.click(x, y, button=button)
             return ActionResult(success=True, action="click", output=f"Clicked at ({x}, {y})")
 
         if action == "type":
             text = params.get("text", "")
             if len(text) > self._MAX_TEXT_LENGTH:
-                return ActionResult(success=False, action="type", error=f"Text too long: {len(text)} > {self._MAX_TEXT_LENGTH}")
+                return ActionResult(
+                    success=False,
+                    action="type",
+                    error=f"Text too long: {len(text)} > {self._MAX_TEXT_LENGTH}",
+                )
             pg.write(text)
             return ActionResult(success=True, action="type", output=f"Typed: {text[:50]}")
 
@@ -369,16 +444,22 @@ class LocalComputerUseSession(ComputerUseSession):
             amount = params.get("amount", 3)
             clicks = amount if direction == "down" else -amount
             pg.scroll(clicks)
-            return ActionResult(success=True, action="scroll", output=f"Scrolled {direction} by {amount}")
+            return ActionResult(
+                success=True, action="scroll", output=f"Scrolled {direction} by {amount}"
+            )
 
         if action == "drag":
             sx, sy = params.get("start_x", 0), params.get("start_y", 0)
             ex, ey = params.get("end_x", 0), params.get("end_y", 0)
             if not (self._validate_coordinates(sx, sy) and self._validate_coordinates(ex, ey)):
-                return ActionResult(success=False, action="drag", error="Drag coordinates out of bounds")
+                return ActionResult(
+                    success=False, action="drag", error="Drag coordinates out of bounds"
+                )
             pg.moveTo(sx, sy)
             pg.dragTo(ex, ey, duration=0.5)
-            return ActionResult(success=True, action="drag", output=f"Dragged from ({sx},{sy}) to ({ex},{ey})")
+            return ActionResult(
+                success=True, action="drag", output=f"Dragged from ({sx},{sy}) to ({ex},{ey})"
+            )
 
         if action == "key":
             key_name = params.get("key_name", "")
@@ -487,7 +568,7 @@ class DockerComputerUseSession(ComputerUseSession):
             screenshot_base64="",
         )
 
-    async def execute_action(self, action: str, **params: Any) -> ActionResult:
+    async def execute_action(self, action: str, **params: object) -> ActionResult:
         """在 Docker 虚拟桌面执行操作
 
         Stub: 实际实现需要通过 Anthropic Computer Use API。
@@ -527,7 +608,7 @@ class ComputerUseSessionManager:
     def get_or_create(
         self,
         session_id: str | None = None,
-        **kwargs: Any,
+        **kwargs: object,
     ) -> ComputerUseSession:
         """获取或创建会话"""
         if session_id and session_id in self._sessions: