finops-caches

/finops:caches

Analyze GitHub Actions cache usage - size breakdown, cache key patterns, branch distribution, and stale cache detection.

When to Use

Scenario	Use this skill	Alternative
Cache usage near limit or unknown	`/finops:caches`	-
Identify stale or orphaned PR caches	`/finops:caches`	-
Review cache key strategy effectiveness	`/finops:caches`	-
Quick overall repo health check	`/finops:overview`	Start with overview first
Compare cache usage across repos	`/finops:compare`	Use compare for multi-repo view
Optimize workflow triggers, not caches	`/finops:waste`	Use waste for workflow-level issues

Context

Current repo URL: !git remote get-url origin

Parameters

Parameter	Description	Default
`repo`	Repository in owner/name format	Current repository
`org:orgname`	Analyze org-wide cache usage	-

Execution

bash "${SKILL_DIR}/scripts/cache-analysis.sh" $ARGS

Output Format

=== Cache Analysis: org/repo ===

Summary:
  45 caches, 2340MB used
  23% of 10GB limit

=== By Key Prefix ===
  node-modules: 12 caches, 1200MB
  playwright: 8 caches, 800MB
  turbo: 15 caches, 300MB

=== By Branch ===
  main: 10 caches, 500MB
  develop: 8 caches, 400MB
  PR 123: 3 caches, 150MB
  PR 118: 3 caches, 140MB

=== Largest Caches ===
  node-modules-linux-abc123: 180MB
  playwright-linux-def456: 150MB

=== Stale Caches (>7 days old) ===
  8 stale caches, 450MB reclaimable
  Oldest: 2025-01-15T10:30:00Z

=== PR Branch Caches ===
  12 PR caches, 580MB (check if PRs are merged/closed)

Agentic Optimizations

Context	Command
Cache list (JSON)	`gh api "/repos/{owner}/{repo}/actions/caches?per_page=100" --jq '.actions_caches'`
Total cache count	`gh api "/repos/{owner}/{repo}/actions/caches" --jq '.total_count'`
Delete stale cache	`gh api -X DELETE "/repos/{owner}/{repo}/actions/caches/{id}"`
Cache key search	`gh api "/repos/{owner}/{repo}/actions/caches?key=prefix" --jq '.actions_caches[].key'`
Compact summary	`bash "${SKILL_DIR}/scripts/cache-analysis.sh" $ARGS`

Post-actions

Based on findings, suggest:

High % of limit -> Clean up stale caches, review key strategies
Many PR caches -> Add cache cleanup workflow for closed PRs
Large single caches -> Consider splitting or compressing

Stale caches -> Provide cleanup command:

# Delete stale caches
gh api "/repos/$REPO/actions/caches?per_page=100" \
  --jq '.actions_caches[] | select(.last_accessed_at < "CUTOFF") | .id' | \
  while read id; do gh api -X DELETE "/repos/$REPO/actions/caches/$id"; done