{ "error": { "code": "...", "message": "...", "retry_after_seconds": null } }. Use codes rather than message text.
Each workspace has a queue limit of ten waiting jobs and a separate 30-source-attempt/hour pilot safety budget. Running-job limits follow the plan: Starter 5, Growth 15, Scale 30; existing developer previews have one slot. Service capacity and per-airline concurrency limits can reduce actual execution below the plan ceiling. See credits and concurrency.
Saved HTML links return
404 not_found for an unknown capture and 410 evidence_unavailable once the 24-hour capture retention has expired or the saved page cannot be verified. Reading the job again does not restore an expired capture. Older signed links may return 403 invalid_html_link when their signature is invalid or expired.