How to fix CrewAI hierarchical DelegateWorkToolSchema validation error
Upgrade CrewAI to a release containing PR #2608. The schema accepts Union[str, dict] and _run coerces dict args back to strings. Four failures look the same, four fixes.
Topic
AI Agents
Agent frameworks (LangChain, CrewAI, etc.)
How to fix LangChain MultiServerMCPClient NotImplementedError on Windows
MultiServerMCPClient fails on Windows because the default Selector event loop has no subprocess transport. Set the Proactor policy to fix it. Telling four host contexts apart up front.
What is the Model Context Protocol (MCP)? A 2026 primer
MCP is the on-demand counterpart to event-driven automation. Zapier triggers workflows; MCP gives the AI hands to call them when asked.
LangChain "Agent stopped due to iteration limit" error: how to fix
Why the "Agent stopped due to iteration limit or time limit" error fires - and the five-step fix that beats just raising max_iterations.