EVE-NG MCP Server

Instructions

Implementation Reference

• eveng_mcp_server/tools/node_management.py:324-361 (handler)

  The main handler function for the 'start_node' MCP tool. It validates input using NodeControlArgs, checks EVE-NG connection, delegates to eveng_client.start_node, and formats success/error responses as TextContent.

  @mcp.tool()
  async def start_node(arguments: NodeControlArgs) -> list[TextContent]:
      """
      Start a specific node.
  
      This tool starts a node in the lab. The node must be in stopped state
      to be started successfully.
      """
      try:
          logger.info(f"Starting node {arguments.node_id} in {arguments.lab_path}")
  
          if not eveng_client.is_connected:
              return [TextContent(
                  type="text",
                  text="Not connected to EVE-NG server. Use connect_eveng_server tool first."
              )]
  
          # Start node
          result = await eveng_client.start_node(arguments.lab_path, arguments.node_id)
  
          if result.get('status') == 'success':
              return [TextContent(
                  type="text",
                  text=f"Successfully started node {arguments.node_id} in {arguments.lab_path}\n\n"
                       f"The node is now booting up. It may take a few moments to become fully operational."
              )]
          else:
              return [TextContent(
                  type="text",
                  text=f"Failed to start node: {result.get('message', 'Unknown error')}"
              )]
  
      except Exception as e:
          logger.error(f"Failed to start node: {e}")
          return [TextContent(
              type="text",
              text=f"Failed to start node: {str(e)}"
          )]

• eveng_mcp_server/tools/node_management.py:53-57 (schema)

  Pydantic model defining the required input schema (lab_path and node_id) for the start_node tool (shared with stop_node, wipe_node, etc.).

  class NodeControlArgs(BaseModel):
      """Arguments for node control operations."""
      lab_path: str = Field(description="Full path to the lab (e.g., /lab_name.unl)")
      node_id: str = Field(description="Node ID to control")

• eveng_mcp_server/tools/__init__.py:24-25 (registration)

  Registration call to register_node_tools (which defines and registers start_node via @mcp.tool() decorator) as part of the main register_tools function.

  # Node management tools
  register_node_tools(mcp, eveng_client)

• eveng_mcp_server/core/eveng_client.py:403-413 (helper)

  Supporting method in EVENGClientWrapper that ensures connection and calls the underlying EVE-NG SDK API to start the specified node.

  async def start_node(self, lab_path: str, node_id: str) -> Dict[str, Any]:
      """Start a specific node."""
      await self.ensure_connected()
  
      try:
          result = await asyncio.to_thread(self.api.start_node, lab_path, node_id)
          self.logger.info("Started node", lab_path=lab_path, node_id=node_id)
          return result
      except Exception as e:
          self.logger.error("Failed to start node", **log_error(e, {"lab_path": lab_path, "node_id": node_id}))
          raise EVENGAPIError(f"Failed to start node: {str(e)}")