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What you saw

The metric (cost or tokens), used amount, threshold, and period vary based on the rule you tripped. The response arrives as HTTP 200 with this text in the assistant message content, not as a 429. A client branching on the HTTP status sees a normal completion.

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Why it happened

You set a limit on the harness’s Limits page (say, “$10/day” or “500k tokens/hour”), and the current period’s usage just crossed it. Manifest blocks every following request until the period resets or you raise the cap. This is different from M204, which is the Manifest Cloud Free plan monthly request quota, and different from provider 402 errors such as “insufficient credits” from OpenRouter.

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How to fix it

  1. Open the dashboard link in the error message. It goes straight to the harness’s Limits page.
  2. Raise the threshold, change the period, or wait for it to reset. The error message tells you which period was hit.
  3. Retry the request.