LangChain

Use this skill to build or refactor LangChain application logic with predictable tool use, structured outputs, and clean runtime boundaries.

Quick Triage

• Use this skill when the task is primarily chain/agent composition, tool calling, middleware, output schemas, or prompt wiring.
• Switch to $langgraph when the core problem is graph topology, node routing, checkpoints, interrupts, or multi-step state machines.
• Switch to $ag-ui when the core problem is event protocol compliance between backend and UI.
• Switch to $copilotkit when the core problem is frontend coagent UX, hooks, and runtime provider wiring.

Workflow