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In productionProbeginnerEmbodied safety

The agent grasps thin air

Gate the grasp on the real depth reading instead of the LLM's guess.

Pairs with Embodied AI: great planner, poor perceiver in Use AI efficiently with ROS 2. Read the concept first, then diagnose it here.

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Operator report

The arm closes on empty space; the grasp point wasn't validated against the depth cloud.

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

01

System boundary

Trace only the relevant path.

3 nodes
  1. 01proposed grasp→
  2. 02depth validation→
  3. 03executeOUT
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
  • Grasp validated vs depth
  • No air grasps
  • Hidden regression behavior
  • Root cause explanation