Debug-action-cache ((full)) May 2026

You can use this report to document findings after debugging cache misses, corruption, or restore failures.

Before diving into debugging, it’s essential to understand what we’re fixing. Action caching stores the outputs of specific build steps (actions) based on their inputs. The logic is simple: Input Hash + Command = Output. debug-action-cache

This guide provides a comprehensive overview of debugging the GitHub Actions cache You can use this report to document findings

Cache Misses: You changed one line of a README file, but the entire C++ library is recompiling. Why did the hash change? The logic is simple: Input Hash + Command = Output

B. Inspect the cache-hit Output

The actions/cache action outputs a boolean variable named cache-hit. You can print this to verify if the restoration actually succeeded.

Part 5: Writing a Custom debug-action-cache Script

Sometimes, built-in tools are insufficient. Create a dedicated debug script in your repo: .github/scripts/debug_cache.sh