Joern MCP Server

Instructions

Loads a CPG from a file if the cpg is not loaded or the cpg is not the same as the filepath.

Args:
    cpg_filepath (str): The path to the CPG file, the filepath is absolute path.

Returns:
    str: True if the CPG is loaded successfully, False otherwise.

Implementation Reference

• server_tools.py:21-35 (handler)

  The load_cpg tool handler function, decorated with @joern_mcp.tool() for registration. It executes joern_remote to load the CPG file and extracts the value.

  @joern_mcp.tool()
  def load_cpg(cpg_filepath: str) -> str:
      """
      Loads a CPG from a file if the cpg is not loaded or the cpg is not the same as the filepath.
  
      Args:
          cpg_filepath (str): The path to the CPG file, the filepath is absolute path.
  
      Returns:
          str: True if the CPG is loaded successfully, False otherwise.
      """
      
      # return extract_value(joern_remote(f'val cpg = CpgLoader.load("{cpg_filepath}")'))
      return extract_value(joern_remote(f'load_cpg("{cpg_filepath}")'))