SKILL.md
LangChain Dev Guide
A systematic summary of typical issues, non-obvious behaviors, and verified solutions encountered in real engineering with the LangChain / LangGraph ecosystem. Every entry comes from a real development scenario and is organized by category.
[!IMPORTANT] This skill is an engineering practice reference, not an introductory tutorial. Each entry assumes the developer is already familiar with basic LangChain concepts (agent, tool, message, graph).
How to Use
- First use the "Scenario Index" below to locate the category file your problem belongs to.
- When unsure which category applies, search keywords directly in the "Common Issues Quick Reference".
- For ContextSeek / semantic memory: start with contextseek-middleware.md to identify your scenario, then go to contextseek-params.md for specific parameter configuration issues.
- Once you find the relevant section, read it in depth — every entry follows the structure Symptom → Cause → Solution → Lessons learned.