Markdown Editor MCP Server

Implementation Reference

• src/markdown_editor/tools/file_ops.py:69-86 (handler)

  Core implementation of the create_file tool handler. Validates path safety, creates parent directories if needed, writes content to the file, and returns success or error status.

  async def create_file(self, path: str, content: str = "") -> Dict[str, Any]:
      """Create file"""
      # Validate path safety
      error = self._validate_path(path)
      if error:
          return {"error": error}
  
      try:
          abs_path = self._get_abs_path(path)
          # Create parent directories if they don't exist
          parent_dir = os.path.dirname(abs_path)
          if parent_dir:
              os.makedirs(parent_dir, exist_ok=True)
          with open(abs_path, "w", encoding="utf-8") as f:
              f.write(content)
          return {"success": True, "path": path, "size": len(content)}
      except Exception as e:
          return {"error": str(e)}

• src/markdown_editor/server.py:416-443 (schema)

  Defines the input schema (path: string required, content: string optional) and output schema (success, path, size) for the create_file tool in the MCP server tool list.

  Tool(
      name="create_file",
      title="Create File",
      inputSchema={
          "type": "object",
          "properties": {
              "path": {
                  "type": "string",
                  "examples": ["./new_document.md", "./notes/todo.md"],
              },
              "content": {
                  "type": "string",
                  "default": "",
                  "examples": ["# New Document\n\nContent here", ""],
              },
          },
          "required": ["path"],
          "additionalProperties": False,
      },
      outputSchema={
          "type": "object",
          "properties": {
              "success": {"type": "boolean"},
              "path": {"type": "string"},
              "size": {"type": "integer"},
          },
      },
  ),

• src/markdown_editor/server.py:525-531 (registration)

  Registers and dispatches the create_file tool call by invoking the imported create_file function and wrapping the result in CallToolResult.

  elif name == "create_file":
      res = await create_file(arguments["path"], arguments.get("content", ""))
      return CallToolResult(
          content=[TextContent(type="text", text="File created")],
          structuredContent=res,
          isError="error" in res,
      )

• src/markdown_editor/tools/file_ops.py:121-122 (registration)

  Global async wrapper function that delegates to the FileOperationsTool instance's create_file method, used by the server dispatch.

  async def create_file(path: str, content: str = ""):
      return await _instance.create_file(path, content)