MCP C

What is mcp-c?

mcp-c is a framework written in C for building Model Context Protocol (MCP) servers efficiently. It uses annotation-based code generation to automate boilerplate, letting developers focus only on writing the server functions.

How to use mcp-c?

Write your MCP tools in src/mcp_server using the EXPORT and EXPORT_AS macros on functions and structs. Build with cmake -B build -S . && cmake --build ., then run the generated binary with ./mcpc (Windows users need vcpkg). The build process runs a code generator that creates serialization code and tool lists automatically.

Key features of mcp-c

• Annotate C structs to auto‑generate JSON schema definitions.
• Export function names as tool handlers via EXPORT_AS macro.
• Automatic serialization between JSON and C structs.
• Built‑in bridge code generation for tool input/output parsing.
• Supports enums, nested structs, and descriptions with DES macro.

Use cases of mcp-c

• Rapidly prototyping an MCP server in C with minimal manual coding.
• Automatically generating JSON schemas for complex nested data types.
• Creating custom MCP tools without writing repetitive glue code.
• Integrating MCP capabilities into existing C‑based projects.