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canarycommit 3e4240a · v1.0.0SKILL.md · Monitoring & Ops

Canary: Post-Deploy Visual Monitor

After a deploy, drives a browser over live pages and compares screenshots, console errors, load times and broken links to a baseline.

It prefers driving the user's real browser and signed-in sessions via Aside; the fallback browser needs a one-time ./setup that may install bun.

npx skills add garrytan/gstack --skill canary
Permissions
  • read-repo
  • write-files
  • shell
  • network
Compatible with
Claude Code, Codex, Cursor, Copilot
GitHub
138.5k
Source
Community · Garry Tan
Status
Scan passed
License
MIT
Category
Monitoring & Ops
Repository
github.com/garrytan/gstack/canary

Core rule

Alert on changes against the baseline, not absolutes, and only when a pattern persists across two or more consecutive checks.

Execution Phases

  1. Phase 01Setup and baseline

    Create .gstack/canary-reports/; with --baseline, capture screenshots, console errors, load times and text for each page before deploying.

  2. Phase 02Discover pages

    Auto-discover same-origin nav links, propose the top five plus the homepage for confirmation, and take a starting snapshot if no baseline exists.

  3. Phase 03Monitoring loop

    Check every page every 60 seconds for the set duration; when a critical or high issue repeats on two checks, ask the user how to proceed.

  4. Phase 04Health report

    Give a HEALTHY, DEGRADED or BROKEN verdict, save Markdown and JSON reports in .gstack/canary-reports/, and offer a baseline update if healthy.

Permissions (summarised from SKILL.md)

CapabilityNeededDetails
File writesLimitedWrites only screenshots, baselines and reports under .gstack/canary-reports/ and history in the gstack state directory; code is not modified unless asked.
Command executionLimitedRuns aside repl or gstack's own headless browser, gstack helper scripts, and commands such as copying screenshots.
Network outboundLimitedVisits only the user-named site and same-origin links; mutating actions on non-local sites need the user's consent first.

SKILL.md frontmatter (YAML)

SKILL.md frontmatter (YAML)commit 3e4240a · v1.0.0
---
name: canary
preamble-tier: 2
version: 1.0.0
description: Post-deploy canary monitoring. (gstack)
allowed-tools:
  - Bash
  - Read
  - Write
  - Glob
  - AskUserQuestion
triggers:
  - monitor after deploy
  - canary check
  - watch for errors post-deploy
---

Related skills

A rule scan cannot catch every risk. Read this skill's SKILL.md and check its permissions before installing.
Markdown version GitHub