OCaml MCP
OCaml implementation of the Model Context Protocol (MCP)
What is OCaml MCP?
OCaml MCP is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to ocaml implementation of the model context protocol (mcp)
OCaml implementation of the Model Context Protocol (MCP)
This server falls under the Developer Tools category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- OCaml implementation of the Model Context Protocol (MCP)
Use Cases
Maintainer
Works with
Installation
Manual Installation
npx ocamlConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use OCaml MCP
The OCaml MCP Server (ocaml-mcp-server) is a full-featured MCP server implementation in OCaml that exposes the Dune build system, OCaml type checker, and file system operations to AI assistants through the Model Context Protocol. It provides real-time build status, target compilation with streaming output, module signature inspection, type-at-position queries, find-definition and find-references navigation, and OCaml-aware file read/write with automatic formatting via Merlin diagnostics. OCaml developers use it to give Claude or other MCP clients deep, accurate understanding of their codebase — going far beyond text search to actual type-system-level awareness.
Prerequisites
- OCaml 5.x and opam package manager installed
- Dune build system installed (opam install dune)
- Merlin language server installed for diagnostics (opam install merlin)
- An MCP-compatible client such as Claude Desktop
- An OCaml project built with Dune so the server can introspect compiled artifacts
Install the ocaml-mcp-server package via opam
Install the server package from the opam repository. This places the ocaml-mcp-server binary on your PATH.
opam install ocaml-mcp-serverVerify the binary is available
Confirm the installation succeeded by checking the version. If the shell reports not found, run eval $(opam env) to ensure the opam environment is sourced.
ocaml-mcp-server --versionBuild your OCaml project first
The MCP server introspects compiled artifacts produced by Dune. Build your project at least once so that module signatures and type information are available.
cd /path/to/your/ocaml-project
dune buildConfigure Claude Desktop to run the server
Add an entry to claude_desktop_config.json. The server runs in stdio mode by default, making it straightforward to launch as a subprocess from Claude Desktop.
{
"mcpServers": {
"ocaml": {
"command": "ocaml-mcp-server"
}
}
}Restart Claude Desktop and verify tools
Relaunch Claude Desktop. The OCaml MCP tools (dune/build-status, ocaml/module-signature, ocaml/type-at-pos, fs/read, etc.) should appear in the tools list. Ask Claude to run dune/build-status to confirm the connection.
OCaml MCP Examples
Client configuration
Claude Desktop configuration for the OCaml MCP Server running in stdio mode, launched as a subprocess.
{
"mcpServers": {
"ocaml": {
"command": "ocaml-mcp-server"
}
}
}Prompts to try
Example prompts that use the OCaml MCP Server's build, type, and code navigation capabilities.
- "What is the current build status of my Dune project? Are there any errors?"
- "Show me the module signature for the Lib.Parser module."
- "What is the type of the expression at line 42, column 10 in src/main.ml?"
- "Find all usages of the function process_event in the codebase."
- "Read src/types.ml with Merlin diagnostics enabled and suggest fixes for any type errors."Troubleshooting OCaml MCP
ocaml/find-definition returns 'experimental' warnings or no results
The find-definition tool is marked experimental in the current implementation. Ensure Merlin is installed (opam install merlin) and that your project has a valid .merlin file or a dune-project that Merlin can discover automatically.
dune/build-status shows stale errors after fixing code
The server reads from Dune's build artifacts. Run dune build manually in your project directory to refresh the artifacts, then query the tool again. The server does not trigger builds automatically.
ocaml-mcp-server not found after opam install
Run eval $(opam env) in your shell (or add it to your shell's rc file) to update PATH with the opam switch's bin directory. Then retry the command.
Frequently Asked Questions about OCaml MCP
What is OCaml MCP?
OCaml MCP is a Model Context Protocol (MCP) server that ocaml implementation of the model context protocol (mcp) It connects AI assistants to external tools and data sources through a standardized interface.
How do I install OCaml MCP?
Follow the installation instructions on the OCaml MCP GitHub repository. Clone the repo, install dependencies, and add the server config to your AI client.
Which AI clients work with OCaml MCP?
OCaml MCP works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is OCaml MCP free to use?
Yes, OCaml MCP is open source and available under the ISC license. You can use it freely in both personal and commercial projects.
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Set Up OCaml MCP in Your Editor
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Quick Config Preview
Add this to your claude_desktop_config.json or .cursor/mcp.json
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