Debug-action-cache |best| -

When console logs are insufficient, you can interact with the GitHub Actions cache management system directly via the command line using the GitHub CLI ( gh ). This allows you to inspect the active state of your repository's storage storage. List All Active Caches

You can query the GitHub API directly.

A broken or inefficient action cache turns a high-performance development pipeline into a frustrating bottleneck. By understanding how cache keys are calculated and utilizing verbose execution logs to isolate non-deterministic inputs, you can confidently debug any debug-action-cache workflow anomaly. Keep your inputs explicit, your environments isolated, and your builds predictably fast. debug-action-cache

The first line of defense is . GitHub Actions supports two environment variables that unlock detailed logs:

Set ACTIONS_STEP_DEBUG=true . Run the workflow. When console logs are insufficient, you can interact

Use flags to prevent compilers from adding timestamps to output binaries.

Once enabled, rerun the failed workflow. The logs will now display exact network calls, cache size metrics, and precise encryption key mismatches during the Restore cache step. 2. Inspect Cache Eviction and Metadata via UI A broken or inefficient action cache turns a

The exact version of the compiler or linter being executed.

Ensure your build actions don't access the internet or arbitrary file system locations.

While caching drastically reduces execution time, it introduces a major point of failure: state persistence. If a cache becomes corrupted, poisoned with bad data, or locked due to permissions errors, subsequent builds will inherit those defects. This results in "flaky builds"—pipelines that fail or succeed unpredictably without any changes to the source code. Common Scenarios Requiring Cache Debugging