MCP Language Server by isaacphi: Setup for Claude, Cursor and Other Apps

• Reads the code where a function or type is defined

  Looks up a symbol by name through the language server and returns the full source code of where it is defined.

  Try: “Show me the definition of the ParseConfig function.”

  Files · definition

• Finds everywhere a symbol is used

  Finds all usages of a function, type or constant across the project and returns the files and locations where it appears.

  Try: “Where is the UserSession type used?”

  Files · references

• Lists errors and warnings the language server reports for a file

  Returns the language server's diagnostics for one file, with optional context lines and line numbers around each problem.

  Try: “What errors does the language server report in src/server.go?”

  Files · diagnostics

• Shows the type and docs for the symbol at a position

  Returns the hover information the language server shows for a given file, line and column, such as a type signature and documentation.

  Try: “What is the type of the symbol at line 42, column 10 of main.go?”

  Files · hover

• Renames a symbol and updates every reference

  Renames a variable, function or class at a given position and updates all references throughout the codebase, through the language server. It rewrites files on disk.

  Try: “Rename the function at line 18, column 6 of util.go to loadSettings.”

  Write · rename_symbol

• Replaces line ranges in a file

  Applies several text edits to a file, each replacing a range of lines with new text, or removing the lines if the text is blank.

  Try: “Replace lines 10 to 14 of handler.go with this corrected block.”

  Write · edit_file

Watch out for

• It can edit files and rename across the project

  The rename_symbol and edit_file tools write to files on disk, and the README documents no read-only option. Use it on a Git-tracked project and review the diff. github.com

• It starts a language server program on your machine

  The server runs whatever language server command you give it, such as gopls, with your user's permissions. Only configure language servers you trust. github.com

• The README calls it beta software

  Expect rough edges and report problems on its issue tracker. github.com

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