Using ocaml-lsp-server via an MCP server

• published

  2025-08-27

• notanotebook

Here's a quick post on how to get the OCaml Language Server (ocaml-lsp-server) working with an MCP server.

We're going to use issacphi's adapter for LSP servers, which is written in go. So install go, and then:

# go install github.com/isaacphi/mcp-language-server@latest

Once that's done, make sure you've got `ocaml-lsp-server` installed in your switch:

# opam install ocaml-lsp-server

Then add the MCP config for claude where you want to run it:

# claude mcp add ocamllsp -s local -t stdio -- /Users/jon/go/bin/mcp-language-server -workspace . -lsp ocamllsp

It'd be nice to get this working `globally` - that is, with `-s user` - but I haven't been able to get that to work yet.