Hardcoded model names like 'openai/gpt-4o-mini' or 'anthropic/claude-sonnet' cause 'No provider available' errors when the specific provider isn't configured. Using 'default' lets the system pick the available provider automatically.
Phase A of Multi-Agent Marketplace architecture: - ReWOOEngine: plan-all-then-execute pattern for parallel data fetch - PlanExecEngine: adapter wrapping GoalPlanner+PlanExecutor+PipelineReplanner - ReflexionEngine: ReAct + Evaluate + Reflect + Retry for high-precision tasks - SkillConfig: extend VALID_EXECUTION_MODES with rewoo/plan_exec/reflexion - ConfigDrivenAgent: add _handle_rewoo/_handle_plan_exec/_handle_reflexion routes - 5 professional agent YAML configs with layered model defaults - 107 unit tests passing
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