# FsLangMCP

> Semantic F# compiler tooling for AI coding agents over MCP.

Canonical: https://neftedollar.com/FsLangMCP/
Repository: https://github.com/Neftedollar/FsLangMCP
NuGet: https://www.nuget.org/packages/FsLangMcp/

## Author

- [Roman Melnikov (Neftedollar)](https://neftedollar.com/)

## Start here

- Getting started: https://neftedollar.com/FsLangMCP/guide/getting-started/
- MCP client configuration: https://neftedollar.com/FsLangMCP/guide/configuration/
- Troubleshooting: https://neftedollar.com/FsLangMCP/guide/troubleshooting/
- Tools reference: https://neftedollar.com/FsLangMCP/tools/reference/
- Detailed tool mechanics: https://neftedollar.com/FsLangMCP/tools/details/
- Why semantic F# matters: https://neftedollar.com/FsLangMCP/concepts/why-semantic-fsharp/
- Release notes: https://neftedollar.com/FsLangMCP/changelog/releases/
- Full LLM context: https://neftedollar.com/FsLangMCP/llms-full.txt

## Core workflow

1. Install with `dotnet tool install -g FsLangMcp`.
2. Run `fslangmcp --bootstrap-tools` to install the reviewed FSAC, ProjInfo, and Fantomas versions.
3. Connect the `fslangmcp` stdio server to an MCP client.
4. Call `set_project` once with a project, solution, or workspace directory.
5. Lead with `find` for semantic navigation and `check` for a compiler verdict.

## Correctness notes

- Treat a search as exhaustive only when both `coverage.complete=true` and `resolution.complete=true`.
- A `check` verdict of `clean` covers the current FCS/check profile, not every Release configuration.
- Before merge or release, run `dotnet build -c Release --warnaserror`.