Semantic search for LangChain, LangGraph, LangSmith & DeepAgents docs and source code.
Semantic search for LangChain, LangGraph, LangSmith & DeepAgents docs and source code. Exposed over MCP by the langchain mcp server, that capability becomes something an assistant can invoke while it works, not something you go and do afterwards.
Add the following configuration to your client's config file:
Everything the assistant can do here goes through one of these:
search_docs — Search documentation, references, and tutorialssearch_langchain_code — Search LangChain source codesearch_langgraph_code — Search LangGraph source codesearch_deepagents_code — Search DeepAgents source codeArchitecture — The Architecture tool exposed by this serverConfiguration — The Configuration tool exposed by this serverInstallation goes through your MCP client rather than a global install: point it at langchain-mcp on npm and it is fetched when the client starts. The copy-paste blocks for Claude Desktop, Claude Code and Cursor are further down this page.
Among the developer tooling options, the useful question is rarely "what can it do" but "what does it cost you to run" — permissions, credentials, and how much of your context its toolset consumes. Langchain's toolset — search_docs, search_langchain_code, search_langgraph_code and 3 more — is a fair guide to whether it matches your workflow. It is maintained by baixianger; worth a glance at recent repository activity before you build anything load-bearing on it.
This entry was verified against Langchain's own documentation before publication; SyncDev keeps the directory reviewed rather than auto-generated.
| Tool | What it does |
|---|---|
| search_docs | Search documentation, references, and tutorials |
| search_langchain_code | Search LangChain source code |
| search_langgraph_code | Search LangGraph source code |
| search_deepagents_code | Search DeepAgents source code |
| Architecture | The Architecture tool exposed by this server. |
| Configuration | The Configuration tool exposed by this server. |
{
"mcpServers": {
"langchain": {
"command": "npx",
"args": ["-y", "langchain-mcp"]
}
}
}Add to claude_desktop_config.json, then restart Claude Desktop.
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