[cache-strategy] Daily Cache Strategy Analysis - 2026-08-17

[github-actions[bot]]

Overview

Analyzed the last 24 hours of agentic workflow runs that declared cache-memory. Two runs matched: Copilot Opt (§32051980416) and Copilot Agent PR Analysis (§32054193614).

Both workflows restore cache-memory with a run_id-scoped key plus a restore-prefix fallback, which is valid. The actual cache reuse logic then checks only for files named with $(date +%Y-%m-%d), so restored content from previous days is ignored on normal scheduled runs.

Warning

Both workflows currently behave like same-day rerun caches, not cross-run daily or weekly caches.

Findings

• Copilot Opt: scheduled weekly, but only reuses copilot-sessions-${TODAY}.json, session-logs-${TODAY}/, and copilot-prs-${TODAY}.json. Because the normal cadence is weekly, prior restored cache content cannot satisfy those exact-date lookups.
• Copilot Agent PR Analysis: scheduled daily, but only reuses copilot-prs-${TODAY}.json. Restored prior-day cache entries are skipped, so the workflow re-fetches PR data on normal runs.
• Copilot Agent PR Analysis also had a failed Fetch Copilot PR data step in run 32054193614, which increases the likelihood of partial or inconsistent cache refreshes on miss days.

Evidence

Copilot Opt

• Restore key in compiled workflow: memory-none-nopolicy-copilot-session-data-${{ github.run_id }} with restore prefix memory-none-nopolicy-copilot-session-data-
• Reuse condition in compiled workflow: exact checks for copilot-sessions-${TODAY}.json, session-logs-${TODAY}/, and copilot-prs-${TODAY}.json
• Result: restored cache can exist, but normal weekly runs still cold-miss the workflow's own filename checks

Copilot Agent PR Analysis

• Restore key in compiled workflow: memory-none-nopolicy-copilot-pr-data-${{ github.run_id }} with restore prefix memory-none-nopolicy-copilot-pr-data-
• Reuse condition in compiled workflow: exact check for copilot-prs-${TODAY}.json
• Agent step summary: Fetch Copilot PR data concluded failure in run 32054193614
• Result: restored prior-day cache content is not reused on the next scheduled daily run

Actions Taken

• Initialized cache-strategy state under /tmp/gh-aw/cache-memory/cache-strategy/
• Recorded today's two runs as misses in runs.json
• Set both workflows to miss_streak: 1 and miss_rate_14d: 1.0 in index.json
• No GitHub issues created today because this is the first recorded analyzer baseline and the streak/rate thresholds for issue creation are not met yet

Recommended Fixes

• Replace exact-date cache lookups with a stable "latest" cache file or a newest-file selection strategy after restore
• Keep the restore-prefix pattern, but decouple cache filenames from the current date when the goal is cross-run reuse
• For Copilot Agent PR Analysis, investigate why Fetch Copilot PR data can fail while the workflow still exits successfully

Context

• Analyzer run: §32055412170
• Historical cache baseline started: 2026-08-17

Generated by 📊 Daily Cache Strategy Analyzer · gpt54 · 79 AIC · ⌖ 12.9 AIC · ⊞ 12.8K · ◷

• expires on Aug 18, 2026, 10:46 AM UTC-08:00

[github-actions[bot]]

This discussion was automatically closed because it expired on 2026-08-18T18:46:40.760Z.

Closed by Workflow