langchain-langgraph

name	langchain-langgraph
description	Use when working with LangChain or LangGraph in this repo, especially for agent construction, middleware, state graphs, persistence, memory, retrieval, runtime context, or durable execution patterns.

LangChain LangGraph

Use this skill as the project-local dispatcher for LangChain and LangGraph guidance derived from the curated reference in .github/LangChain-LangGraph_organized_reference.md.

Workflow

1. Open references/index.md first.
2. Pick the smallest matching reference file instead of loading everything.
3. Prefer the LangChain-side files for agent construction, prompts, tools, ToolRuntime, middleware, model routing, and structured output.
4. Prefer the LangGraph-side files for graph design, reducers, checkpoints, interrupts, subgraphs, streaming, and durable execution.
5. Prefer the memory and retrieval files for long-term memory, state/store separation, vector stores, loaders, splitters, embeddings, and RAG architecture.
6. Preserve the original source doc as the canonical reference for cross-checking; this skill is a bounded access layer, not a replacement source.

High-Value Repo Rules

• Prefer explicit LangGraph orchestration for complex workflows instead of burying a full agent loop inside a graph node.
• Reuse model and agent instances instead of rebuilding them inside each call path.
• Use structured output consistently for LLM and tool-facing boundaries when typed data matters.
• Keep async usage end-to-end across LangChain and LangGraph integrations.
• Preserve provider-specific message metadata when the model requires it across turns.
• Normalize persisted agent state when loading from checkpointers if schema or version drift is possible.
• Keep code examples close to the topic-specific references instead of collapsing them into abstract summaries.

Reference Files

• references/index.md
• references/01-langchain-overview.md
• references/02-prompts-and-messages.md
• references/03-tools-and-toolruntime.md
• references/04-model-selection-and-structured-output.md
• references/05-middleware-and-guardrails.md
• references/06-runtime-state-store-context.md
• references/07-langgraph-state-nodes-edges.md
• references/08-checkpointing-persistence-durability.md
• references/09-interrupts-hitl-resume.md
• references/10-subgraphs-and-streaming.md
• references/11-multi-agent-patterns.md
• references/12-memory.md
• references/13-retrieval-rag.md

Source Preservation

The source reference remains in .github/LangChain-LangGraph_organized_reference.md. This skill is an opencode-native access layer and does not replace the preserved source document.