{
  "id": 24026,
  "title": "I told one AI to demolish the handoff prompt I wrote for another AI. It found a test that passes even when it's empty",
  "url": "https://urgent.news/2026/08/02/i-told-one-ai-to-demolish-the-handoff-prompt-i-wrote-for-another-ai",
  "topic": "ai",
  "section": "AI",
  "published": "2026-08-02T03:06:19.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/jun_uen0/i-told-one-ai-to-demolish-the-handoff-prompt-i-wrote-for-another-ai-it-found-a-test-that-passes-3o70"
  },
  "original_language": "en",
  "account": "A reporter, while working on a project with Claude Code, faced an unsettling issue. The commander session wrote the instructions, while separate worker sessions implemented them in parallel. The commander's task was to create a handoff prompt that the worker could read and execute. The handoff prompt was deemed the most dangerous part of the process, as the worker trusted it as the specification and began working immediately. Before handing over the instructions, the reporter ran them past a subagent designed to find flaws and not approve. This time, however, the demolition agent discovered something alarming. The first objection was that the test defined as \"Get the XX test passing (green)\" was flawed. The demolition agent found that the test only checked if the process ended, not if it succeeded. The second objection revealed that the config flag to switch in the real component did not exist, and the function it referenced was never called. The reporter, confident in their instructions, had not double-checked the code before handing it over. This incident highlights the importance of thoroughly reviewing the code before delegating tasks, as relying solely on written instructions can lead to significant problems.",
  "summary": "The setup for building an app with Claude Code involves a \"commander\" session writing instructions and separate \"worker\" sessions implementing them in parallel. The commander's job is to create a handoff prompt that a worker can read and run with, but this prompt can be problematic if it contains errors. To mitigate this, a subagent is used to demolish the instructions before they are handed over to a worker.\n\nAccording to Dev.to, this subagent found two issues with the handoff prompt. Firstly, a test that was supposed to check if something was working correctly would pass even if the thing being tested failed, as long as the process ran to the end. This was because the test only checked if the process had completed, not if it had succeeded. Additionally, exceptions were being swallowed, so the test would still pass even if something went wrong.\n\nDev.to reports that the subagent also found that a config flag that was supposed to swap in a real component did not actually exist, as the function that would have performed the swap was not connected to anything in the UI. This meant that a worker would have been unable to find the switch or would have had to fabricate something similar. The fact that these errors were not caught until the subagent reviewed the code highlights the importance of thoroughly checking instructions before handing them over to a worker.",
  "key_points": [
    "Reporter's handoff prompt led to flawed test discovery",
    "Test only checked process ended, not succeeded",
    "Config flag for real component did not exist"
  ],
  "editors_take": null,
  "illustration": "https://urgent.news/ill/24026.png",
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}