langchain.com

LangChain develops open-source and hosted tooling for building, deploying, and observing LLM applications and agents. Its LangSmith product provides deployment, tracing, evaluation, and prompt-management capabilities for agent-based applications.

6 integrations · MCP · REST · CLI

LangChain exposes public and authenticated MCP endpoints plus a deployable Agent Server HTTP API and MCP endpoint, and ships the LangGraph CLI for local build/deploy workflows.

discovered 2mo ago

MCP servers4

LangChain docs MCP serverdiscoveredstreamable-http
LangSmith Remote MCPdetectedstreamable-http
LangSmith MCP Server (hosted standalone)discoveredstreamable-http
LangSmith Deployment Agent Server MCP endpointdiscoveredstreamable-http

REST · OpenAPI1

LangSmith Deployment Agent Server APIdiscoveredrest

CLI1

LangGraph CLIdiscoveredlanggraph

Credentials

OAuth 2.0oauth2

OAuth 2.0 — self-onboarding

Point your MCP client at the server URL and approve access in the browser. The server supports OAuth Dynamic Client Registration (RFC 7591), so the client registers itself automatically — no developer-portal app, client_id, or client_secret to create.

conventions · 0/7 published

integrations.json——
llms.txt✗/llms.txt
API catalog✗/.well-known/api-catalog
OpenAPI document✗/api/schema/, /openapi.json, /swagger.json, /api/openapi.json, or /v1/openapi.json
MCP server card✗/.well-known/mcp/server-card.json
OAuth protected resource✗/.well-known/oauth-protected-resource
Agent card✗/.well-known/agent-card.json
Agent skills✗/.well-known/agent-skills/index.json

Publish these signals → /publishing