What macros are available in mcp-c?
`EXPORT` marks a struct or function for export; `EXPORT_AS(name)` gives it a custom name for tool mapping; `DES("description")` adds JSON schema descriptions.
MCP C
@ZenWayne
Basic information
About MCP C
mcp server frarmwork written in c, developing efficiently and effortlessly
MCP C config
No standard config provided
This server doesn't expose a parseable MCP config block in its README. See the repository for install instructions.
RepositoryMCP C tools
Tool list not available yet
This listing does not currently have a tool list to display. This does not mean the server has no tools; check its documentation for supported capabilities.
We auto-extract tools from the README. The maintainer can list them under a ## Tools heading to populate this section.
Overview
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_ASmacro. - Automatic serialization between JSON and C structs.
- Built‑in bridge code generation for tool input/output parsing.
- Supports enums, nested structs, and descriptions with
DESmacro.
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.
Frequently asked questions
How do I define a tool in mcp-c?
Write a C function that returns `cJSON*` and annotate it with `EXPORT_AS(tool_name)`. The tool name can be anything, including `tools/list` for the standard MCP list endpoint.
What files does the code generator produce?
It generates `generated_bridge_code.c` (JSON‑to‑struct parsing) and `generated_function_signatures.c` (struct definitions and the `get_all_function_signatures_json` function).
What are the prerequisites to build mcp-c?
You need cmake, clang, and [cJSON](https://github.com/DaveGamble/cJSON). On Windows, vcpkg is also required.
How is the generated JSON schema structured?
It follows a `$defs`-based JSON Schema draft‑07 format, with separate definitions for enums, objects, and their properties, plus a `tools` array listing each exported tool and its input schema.
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