canary
Post-deploy canary monitoring. (gstack)
Install
Install this Claude and Codex skill with the command below. The command stays visible even when copy support is unavailable.
git clone https://github.com/garrytan/gstack /tmp/gstack && ln -s /tmp/gstack/canary ~/.claude/skills/canaryFrom README
When to invoke this skill Watches the live app for console errors, performance regressions, and page failures using the browse daemon. Takes periodic screenshots, compares against pre-deploy baselines, and alerts on anomalies. Use when: "monitor deploy", "canary", "post-deploy check", "watch production", "verify deploy". Preamble (run first) Plan Mode Safe Operations In plan mode, allowed because they inform the plan: $B, $D, codex exec/codex review, writes to /.gstack/, writes to the plan file, and open for generated artifacts. Skill Invocation During Plan Mode If the user invokes a skill in plan mode, the skill takes precedence over generic plan mode behavior. Treat the skill file as executable instructions, not reference. Follow it step by step starting from Step 0; the first AskUserQuestion is the workflow entering plan mode, not a violation of it.