Errors
| Status | Code | When |
|---|---|---|
| 400 | bad_request | Invalid input. details lists the fields or the predicate paths that failed. |
| 401 | unauthorized | No key, an unknown key, an expired sandbox. |
| 403 | forbidden | The key lacks the scope the operation needs. |
| 404 | not_found | The message names the operation that lists the thing. |
| 409 | conflict | A bucket or destination with that name exists; approving a capture with unresolved validation issues. |
| 413 | too_large | The message exceeds the size limit. |
| 422 | unparseable | The email could not be parsed at all. |
| 429 | cap_reached | A sandbox has reached its message cap. |
| 500 | internal | Our fault. |
Over MCP, the same errors come back as isError results with the same text.
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