Langchain Langgraph

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.

Source: Harmeet10000/AgentNexus-LangChain-FastAPI — distributed by TomeVault.