git MCP server

Instructions

Implementation Reference

• src/git/src/mcp_server_git/server.py:119-126 (handler)

  Core handler function that computes the git diff against a specified target ref
  def git_diff(repo: git.Repo, target: str, context_lines: int = DEFAULT_CONTEXT_LINES) -> str: # Defense in depth: reject targets starting with '-' to prevent flag injection, # even if a malicious ref with that name exists (e.g. via filesystem manipulation) if target.startswith("-"): raise BadName(f"Invalid target: '{target}' - cannot start with '-'") repo.rev_parse(target) # Validates target is a real git ref, throws BadName if not return repo.git.diff(f"--unified={context_lines}", target)
• src/git/src/mcp_server_git/server.py:33-36 (schema)

  Pydantic input schema for the git_diff tool
  class GitDiff(BaseModel): repo_path: str target: str context_lines: int = DEFAULT_CONTEXT_LINES
• src/git/src/mcp_server_git/server.py:302-306 (registration)

  Registration of the git_diff tool in the MCP server's list_tools method
  Tool( name=GitTools.DIFF, description="Shows differences between branches or commits", inputSchema=GitDiff.model_json_schema(), ),
• src/git/src/mcp_server_git/server.py:412-417 (handler)

  MCP call_tool dispatcher case that executes the git_diff tool and formats the response
  case GitTools.DIFF: diff = git_diff(repo, arguments["target"], arguments.get("context_lines", DEFAULT_CONTEXT_LINES)) return [TextContent( type="text", text=f"Diff with {arguments['target']}:\n{diff}" )]