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Development Notes for Claude

Build System

This project uses Nix and direnv for dependency management, NOT plain cabal.

Important Commands

  • NEVER run cabal update directly
  • Use direnv exec . cabal build instead of cabal build when there are dependency issues
  • Dependencies are provided via Nix and loaded through direnv
  • If you add dependencies in cabal files or change nix files, you may need to use direnv exec . to reload the environment

Testing Philosophy

When writing tests for functionality, always encode them as unit tests for future reference and regression testing. One-off manual tests are useful for initial verification, but should be converted to automated tests if the functionality is meant to be maintained.

Project Structure

  • MCP server for Hoogle (Haskell documentation search)
  • Main entry point: app/Main.hs
  • Library code: src/
  • Tests: test/

MCP Server Details

The server provides a hoogle_search tool that:

  • Takes a query string parameter
  • Calls hoogle search -- <query> on the command line
  • Returns the search results to the MCP client