Why Did DeepSeek Harness Stop Working After an Update, and What Next?

1. Build a timeline for DeepSeek Harness after an update

Record the last observed success, update and first observed failure, with dates, times and time zone where known. If you cannot verify the previous version, say “unknown.”

The official repository (opens in a new tab) describes Harness as developer-preview software with compatibility-breaking changes. That makes version comparison worthwhile, but it does not establish that a particular failure is an upstream regression.

For example, “worked Monday; updated Tuesday; first retry failed Wednesday” leaves a gap. A provider change, different session or altered configuration could also fall within it. Treat these as checks, not conclusions.

2. Identify what actually changed

Record your installation route and the version information shown by the installed software or package records. Note the operating system, relevant runtime versions and any plugins involved in the failing task. A source checkout should have a recorded revision as well as an explanation of how it was built.

Keep installed-state evidence separate from intended-state evidence. Downloading version X does not prove the running process is version X. An update notice does not show which components changed. Mark missing evidence unverified.

• Before: last known working version, task and launch method.
• After: current version, same task’s result and exact redacted error.
• Other changes: provider settings, workspace, plugins or system updates.

3. Compare configuration without exporting secrets

Inspect configuration changes locally. Compare the selected provider, model, workspace and profile identity before looking for less obvious differences. Record only the non-sensitive fields relevant to the failure. Do not upload a complete settings directory as a shortcut.

The official provider guide (opens in a new tab) notes that an existing session can retain its recorded model, while changing the selection sets the default for new sessions. A comparison involving different sessions therefore needs the model recorded for each.

If a provider or model was removed, renamed or recreated during troubleshooting, include that in the timeline. Your comparison should distinguish the original update from later experiments. Otherwise a helper may investigate the second problem while you are describing the first.

4. Repeat a minimal reproduction under controlled conditions

Use a disposable environment with a non-sensitive sample task and the narrowest available access. Record the exact input and expected result before retrying. Keep that input unchanged while investigating one candidate difference.

An illustrative check is opening a selected sample workspace and requesting a short text response without edits or commands. If the failure only occurs during another operation, describe that operation precisely and reduce it to a synthetic example when possible. Do not claim the reduced example reproduces the bug until you have observed it.

For each attempt, note what stayed the same, what changed and what happened. “New session, same provider and model, same error” is stronger evidence than “tried everything.” For intermittent behavior, report actual attempts instead of inventing a success rate.

5. Choose recovery only after preserving evidence

Read upstream guidance that matches the affected versions before attempting a migration or downgrade. This article does not supply a universal rollback command. A recovery procedure may depend on installation route and the state of local configuration.

Preserve the current state and a recovery copy before an authorized change. If stored-data compatibility is unclear, ask the maintainer or administrator before reusing it with another version. Do not delete configuration without understanding what would be lost.

The DeepSeekDSH error index (opens in a new tab) can help classify the current symptom. Verify version-specific advice upstream.

Conclusion: report the comparison, not a guessed cause

Troubleshooting DeepSeek Harness after an update should end with a restored, observed result or a precise regression report. State the versions you verified, the smallest reproduction and what remains unknown. That gives the next person a concrete difference to investigate without overstating causation.