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PublishedApril 26, 2026 at 11:04 AM
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name: canary-watch description: Use this skill to monitor a deployed URL for regressions after deploys, merges, or dependency upgrades. origin: ECC
Canary Watch — Post-Deploy Monitoring
When to Use
- After deploying to production or staging
- After merging a risky PR
- When you want to verify a fix actually fixed it
- Continuous monitoring during a launch window
- After dependency upgrades
How It Works
Monitors a deployed URL for regressions. Runs in a loop until stopped or until the watch window expires.
What It Watches
1. HTTP Status — is the page returning 200?2. Console Errors — new errors that weren't there before?3. Network Failures — failed API calls, 5xx responses?4. Performance — LCP/CLS/INP regression vs baseline?5. Content — did key elements disappear? (h1, nav, footer, CTA)6. API Health — are critical endpoints responding within SLA?
Watch Modes
Quick check (default): single pass, report results
/canary-watch https://myapp.com
Sustained watch: check every N minutes for M hours
/canary-watch https://myapp.com --interval 5m --duration 2h
Diff mode: compare staging vs production
/canary-watch --compare https://staging.myapp.com https://myapp.com
Alert Thresholds
yaml
critical: # immediate alert- HTTP status != 200- Console error count > 5 (new errors only)- LCP > 4s- API endpoint returns 5xxwarning: # flag in report- LCP increased > 500ms from baseline- CLS > 0.1- New console warnings- Response time > 2x baselineinfo: # log only- Minor performance variance- New network requests (third-party scripts added?)
Notifications
When a critical threshold is crossed:
- Desktop notification (macOS/Linux)
- Optional: Slack/Discord webhook
- Log to
~/.claude/canary-watch.log
Output
markdown
## Canary Report — myapp.com — 2026-03-23 03:15 PST### Status: HEALTHY ✓| Check | Result | Baseline | Delta ||-------|--------|----------|-------|| HTTP | 200 ✓ | 200 | — || Console errors | 0 ✓ | 0 | — || LCP | 1.8s ✓ | 1.6s | +200ms || CLS | 0.01 ✓ | 0.01 | — || API /health | 145ms ✓ | 120ms | +25ms |### No regressions detected. Deploy is clean.
Integration
Pair with:
/browser-qafor pre-deploy verification- Hooks: add as a PostToolUse hook on
git pushto auto-check after deploys - CI: run in GitHub Actions after deploy step