Nmap MCP Server

Instructions

Implementation Reference

• server.py:121-124 (registration)

  Registration of the nmap_service_detection tool using the @app.tool decorator with name and description.
  @app.tool( name="nmap_service_detection", description="Perform service and version detection scan" )
• server.py:125-138 (handler)

  The handler function that constructs Nmap arguments for service/version detection (-sV with version intensity) and executes via run_nmap_command, returning formatted results.
  async def nmap_service_detection( targets: str, ports: str = "common", intensity: int = 7 ) -> str: """Perform service and version detection scan.""" args = ["-sV", f"--version-intensity={intensity}", "-p", ports, targets] result = run_nmap_command(args) if result["success"]: return f"Service detection scan completed:\n\n{result['stdout']}" else: return f"Service detection scan failed:\n\n{result['stderr']}"
• server.py:38-92 (helper)

  Shared helper function that runs the nmap subprocess command with given arguments, handles timeout and errors, and returns structured results used by the nmap_service_detection handler.
  def run_nmap_command(args: List[str], timeout: int = 300) -> Dict[str, Any]: """ Execute an nmap command and return the results. Args: args: List of nmap command arguments timeout: Command timeout in seconds Returns: Dictionary containing command output, error, and exit code """ try: # Construct the full nmap command cmd = ["nmap"] + args logger.info(f"Executing nmap command: {' '.join(cmd)}") # Run the command with timeout result = subprocess.run( cmd, capture_output=True, text=True, timeout=timeout, check=False ) return { "stdout": result.stdout, "stderr": result.stderr, "exit_code": result.returncode, "success": result.returncode == 0 } except subprocess.TimeoutExpired: return { "stdout": "", "stderr": f"Command timed out after {timeout} seconds", "exit_code": -1, "success": False } except FileNotFoundError: return { "stdout": "", "stderr": "nmap command not found. Please ensure nmap is installed and in PATH", "exit_code": -1, "success": False } except Exception as e: return { "stdout": "", "stderr": f"Error executing nmap command: {str(e)}", "exit_code": -1, "success": False }