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What you saw

[🦚 Manifest M003] That doesn't look right. Manifest keys start with "mnfst_". Grab yours from the dashboard.
See https://manifest.build/docs/errors/M003

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Why it happened

Manifest keys always start with mnfst_. Your token has a different prefix, which almost always means a provider key (OpenAI, Anthropic, etc.) got pasted into the wrong field.

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How to fix it

  1. Open the dashboard and copy your agent’s key. It looks like mnfst_xxxxxxxxxxxx.
  2. Replace the token in your client’s config and retry.
  3. Provider keys (OpenAI’s sk-..., etc.) belong on the Routing page, not in the Authorization header.