lc2mcp
lc2mcp is a Python adapter that converts existing LangChain tools (e.g., @tool functions, StructuredTool, BaseTool-derived tools) into FastMCP-compatible tools, registering them on a FastMCP server with optional context injection, docstring/args-schema handling, and namespace/collision management.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
lc2mcp appears to provide context injection patterns but does not document a security model (auth schemes, scope enforcement, or secret-handling guarantees). TLS enforcement and transport security are not specified in the library README. Dependency hygiene is indeterminate from provided data; manifest includes several optional server dependencies including passlib/python-jose-like packages, but no evidence of vulnerability status or secure defaults is provided.
⚡ Reliability
Best When
You already have LangChain tools and want to rapidly expose them as MCP tools with consistent JSON schema and optional runtime/context wiring.
Avoid When
You need a turnkey, centrally managed API with documented auth/rate limits/SLA; lc2mcp focuses on adaptation rather than operating a managed endpoint.
Use Cases
- • Expose existing LangChain tool ecosystem to MCP clients (e.g., Claude, Cursor) via FastMCP servers
- • Create MCP servers quickly from LangChain tools with minimal boilerplate
- • Inject authentication/user/app context and MCP context into tool execution
- • Standardize tool schemas via docstring parsing and/or Pydantic args_schema conversion
Not For
- • Producing a hosted SaaS MCP service out of the box (appears to be a local library/tooling layer)
- • Use as a standalone tool registry without understanding FastMCP server setup
- • Security-critical authentication/authorization enforcement unless you implement it in your own runtime/context layer
Interface
Authentication
README describes passing auth/user info via Context state and a runtime_adapter into LangChain ToolRuntime context, but does not specify an authentication scheme implemented by lc2mcp itself.
Pricing
No pricing information provided; appears to be an open-source library distributed via PyPI.
Agent Metadata
Known Gotchas
- ⚠ lc2mcp is an adapter; actual runtime behaviors (auth, context, tool execution semantics) depend on your FastMCP server setup and your tool implementation
- ⚠ Parameter descriptions require parse_docstring=True or args_schema; otherwise schema may lack field descriptions
- ⚠ Name collision handling defaults to on_name_conflict='error'—agents should avoid assuming silent overwrites
Alternatives
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Scores are editorial opinions as of 2026-03-30.