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What you saw

[🦚 Manifest M300] `messages` array is required.
See https://manifest.build/docs/errors/M300

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Why it happened

The OpenAI-compatible chat completions API requires a messages array with at least one entry. Manifest got a body where messages was missing, not an array, or empty.

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How to fix it

Send a body shaped like this: 
{
  "model": "auto",
  "messages": [
    { "role": "user", "content": "Hello" }
  ]
}
The OpenAI SDK handles this for you. If you’re hand-rolling the request, eyeball the JSON before posting.