Canary Watch

Monitors your deployed URLs after pushes to catch regressions you'd otherwise miss until a user complains. Checks HTTP status, console errors, network failures, performance metrics like LCP and CLS, SSE stream health, and static asset integrity. Run it once for a quick smoke test or set it to loop every few minutes during a launch window. The baseline comparison is smart: it only alerts on new console errors and performance deltas, not every warning your app already had. Honestly most useful when you've just deployed something risky and want to walk away confident, or when you need sustained monitoring during a critical release window. Beats refreshing the browser and checking DevTools manually.

skills.sh installs: 3.9K
GitHub stars: 229.1K
last updated: Jul 14, 2026

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Install

$ npx -y skills add affaan-m/everything-claude-code --skill canary-watch --agent claude-code

Installs into .claude/skills of the current project.

Files

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?
7. Static Assets — are JS, CSS, image, and font requests returning 2xx/3xx with expected content types?
8. SSE Streams — do event-stream endpoints connect and receive an initial event or heartbeat?

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

SKILL.md on GitHub

Details

Repository: github.com/affaan-m/everything-claude-code
First seen: Apr 16, 2026