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What you saw

[🦚 Manifest M301] `messages` array exceeds maximum length of 1000.
See https://manifest.build/docs/errors/M301

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Why it happened

Manifest caps each request at 1000 messages so scoring and tier resolution stay fast. Long agent loops that never prune their context window hit this faster than you’d think.

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How to fix it

  1. Trim conversation history before sending. Keep the last N messages plus the system prompt.
  2. Summarize older turns into a single message instead of replaying the raw history.
  3. If you actually need more than 1000, split the work across multiple requests.