Debug-action-cache [upd] ❲FULL❳

This helps you verify if the cache key you expect to exist actually exists in the backend.

: Go to your repository Settings > Secrets and variables > Actions and add a secret named ACTIONS_STEP_DEBUG with the value true .

If you see Validation: SHA256 mismatch , your cache is corrupted (rare, but happens with network proxies). The solution is to delete the cache key. debug-action-cache

On Linux:

If a compiler or script includes timestamps or non-deterministic paths, the hash will change every time, breaking cacheability. This helps you verify if the cache key

: The runner did not find an exact match but found an older version using a fallback prefix.

Step-by-Step Guide to Executing a debug-action-cache Workflow The solution is to delete the cache key

To prevent the need for intense debugging sessions in the future, build your workflows with these defensive caching strategies:

When your pipeline behaves unexpectedly, follow this systematic debugging protocol to uncover the root cause. 1. Enable Step Debug Logging

GitHub Actions has a built-in mechanism to increase log verbosity.