auth token expired mid-checkpoint upload and the agent failed to resume the upload after token error

TL;DR

Treat the upload as a resumable transfer, not a single call: when the credential dies mid-upload, renew it and resume from the uploaded offset or restart the file cleanly, after confirming what the server recorded. Chunk large checkpoints, keep the upload session's identity in state, and verify the final artifact by size and hash before marking the checkpoint step done.

auth token expired mid-checkpoint upload and the agent failed to resume the upload after token error

Use this when

• The run or call fails with this symptom: auth token expired mid-checkpoint upload and the agent failed to resume the upload.
• You are working on an agent uploading checkpoints during long training runs and the failure repeats on the same run or configuration.
• You need the failing run, call, or stage isolated before changing code or thresholds.

Not for this skill when

• An upload service with no resume support, where the fix is smaller checkpoint parts rather than session resume.
• The error text names a different tool, stage, or root cause. Match the verbatim error first and use that skill.

Steps

1. Query the destination for the state of the interrupted upload: absent, partial, or complete under a session id. Verify: the server's view of the upload is known
2. Renew the credential and construct a fresh client, since the old one caches the expired value. Verify: calls succeed with the new credential
3. Resume the session if the service supports it, or restart the file upload cleanly, deleting any partial object first. Verify: the transfer completes from a known state
4. Verify the finished artifact's size and hash against the local checkpoint before recording success. Verify: the uploaded checkpoint is proven intact

Variant phrasings

token expired mid checkpoint upload agent failed resume

The verbatim phrasing.

agent checkpoint upload interrupted auth resume fix

The resume phrasing.

checkpoint upload token expiry partial object verify

The partial-object phrasing.

Compatibility: Agent checkpoint uploads to trackers or registries with resumable transfer

Why it happens

Long uploads straddle credential lifetimes by arithmetic, so expiry mid-transfer is a normal event the workflow must absorb. An agent that holds the whole upload in one call and one credential has no recovery point, and typically reports failure while leaving a partial object behind.

Edge cases / pitfalls

• Partial objects with the final name are dangerous; upload to a staging name and rename on verified completion.
• Align checkpoint cadence with credential lifetime so most uploads finish inside one credential's life.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_t1VQPJB8SM0Khu-tB9BxRA