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In productionProbeginnerAI code review

The AI's URDF won't spawn in Harmonic

Replace the Gazebo Classic plugin the LLM used with the Harmonic system plugin.

Pairs with Generating nodes, launch, URDF, and messages in Use AI efficiently with ROS 2. Read the concept first, then diagnose it here.

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Operator report

The robot never spawns; Gazebo Harmonic ignores the `<gazebo>` plugin block.

Ubuntu 24.04, ROS 2 Jazzy, rclpy/rclcpp, an LLM coding assistant + MCP

01

System boundary

Trace only the relevant path.

3 nodes
  1. 01LLM URDF→
  2. 02plugin syntax→
  3. 03Gazebo HarmonicOUT
02

How this lab works

You diagnose it. No command list.

Open the repair workspace and gather your own evidence in a real terminal. No diagnostic commands are handed to you - finding the fault is the exercise. Stuck? Progressive hints unlock inside the workspace.

03

Verification

Pass more than the visible symptom.

4 checks
  • Harmonic plugin used
  • Model spawns
  • Hidden regression behavior
  • Root cause explanation