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langchain-middleware

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INVOKE THIS SKILL when you need human-in-the-loop approval, custom middleware, or structured output. Covers HumanInTheLoopMiddleware for human approval of dangerous tool calls, creating custom middleware with hooks, Command resume patterns, and structured output with Pydantic/Zod.

config/skills/langchain-middleware/SKILL.md

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Last checked
Nov 9, 2026

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Repository last updated
Nov 10, 2026
License
MIT

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<overview>
Middleware patterns for production LangChain agents:

- **HumanInTheLoopMiddleware** / **humanInTheLoopMiddleware**: Pause before dangerous tool calls for human approval
- **Custom middleware**: Intercept tool calls for error handling, logging, retry logic
- **Command resume**: Continue execution after human decisions (approve, edit, reject)

**Requirements:** Checkpointer + thread_id config for all HITL workflows.
</overview>

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## Human-in-the-Loop
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