NebulaGraph MCP Server

Instructions

Implementation Reference

• src/nebulagraph_mcp_server/server.py:158-177 (handler)

  The handler function for the 'list_spaces' tool, decorated with @mcp.tool() for registration in the MCP server. It connects to NebulaGraph, executes 'SHOW SPACES' query, and formats the list of available spaces as output.

  @mcp.tool()
  def list_spaces() -> str:
      """List all available spaces
      Returns:
          The available spaces
      """
      pool = get_connection_pool()
      session = pool.get_session(
          os.getenv("NEBULA_USER", "root"), os.getenv("NEBULA_PASSWORD", "nebula")
      )
  
      try:
          result = session.execute("SHOW SPACES")
          if result.is_succeeded():
              spaces = result.column_values("Name")
              return "Available spaces:\n" + "\n".join(f"- {space}" for space in spaces)
          return f"Failed to list spaces: {result.error_msg()}"
      finally:
          session.release()