Canary Watch

This is post-deploy verification that actually runs checks instead of just hoping your release didn't break anything. Point it at a URL after you ship and it monitors HTTP status, console errors, network failures, Core Web Vitals, and whether critical page elements are still there. You can run it once as a quick smoke test or set it to watch continuously during a launch window. It diffs against a baseline so you catch regressions like LCP jumping 500ms or new console errors that weren't there before. The SSE stream monitoring is a nice touch since most tools ignore event-stream endpoints entirely. Pairs well with CI pipelines or just run it manually when you merge something scary.

skills.sh installs: 5.4K
GitHub stars: 300.3K
last updated: Aug 21, 2026

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Install

$ npx -y skills add affaan-m/ecc --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/ecc
Categories: DevOps & CI/CD, Release Management, Debugging
First seen: Jul 14, 2026