MCP-TY

Instructions

Implementation Reference

• src/mcp_ty/server.py:565-623 (handler)

  The 'safe_rename' tool implementation which renames a symbol in a file and optionally applies the changes. It is decorated with @mcp.tool().

  async def safe_rename(
      file_path: str, line: int, column: int, new_name: str, apply: bool = False
  ) -> str:
      """Rename symbol across project. Set apply=True to execute."""
      client = _get_client()
  
      path = Path(file_path).resolve()
      if not path.exists():
          return _error(f"File not found: {file_path}")
  
      try:
          await client.open_document(path)
  
          workspace_edit = await client.rename_symbol(
              path, line - 1, column - 1, new_name
          )
  
          if not workspace_edit:
              return _not_found(f"Cannot rename at {path.name}:{line}:{column}")
  
          all_edits = workspace_edit.get_all_edits()
          total_edits = sum(len(e) for e in all_edits.values())
  
          if not apply:
              preview = []
              for uri, edits in all_edits.items():
                  edit_path = _uri_to_path(uri)
                  for e in edits:
                      text_preview = e.new_text[:80].replace("\n", "\\n") if e.new_text else "(delete)"
                      preview.append({
                          "file": edit_path.name,
                          "line": e.range.start.line + 1,
                          "column": e.range.start.character + 1,
                          "new_text": text_preview
                      })
              return _ok({
                  "preview": True,
                  "new_name": new_name,
                  "edits_count": total_edits,
                  "files_count": len(all_edits),
                  "edits": preview
              })
  
          applied_files = []
          for uri, edits in all_edits.items():
              file_to_edit = _uri_to_path(uri)
              if file_to_edit.exists():
                  new_content = _apply_edits_to_file(file_to_edit, edits)
                  file_to_edit.write_text(new_content, encoding="utf-8")
                  applied_files.append(file_to_edit.name)
  
          return _ok({
              "applied": True,
              "new_name": new_name,
              "modified_files": applied_files
          })
  
      except Exception as e:
          return _error(str(e))