Update docs/overview/changelog.md with entries for changes since a base commit, in Zulip's curated changelog style.
Visually verify UI changes using Puppeteer screenshots. Use when you need to check layout, colors, positioning, or other visual aspects of a UI change.
Fetch messages from a Zulip narrow URL (chat.zulip.org). Use when the user shares a Zulip conversation link, when you encounter a Zulip link in a GitHub issue or PR, or when a Zulip conversation references another Zulip thread that may be relevant.
Debug node test coverage failures. Use when ./tools/test-js-with-node --coverage reports lines missing coverage.
Fix backend test coverage gaps. Use when CI output or test-backend --coverage reports missing lines, like "ERROR: path/to/file.py no longer has complete backend test coverage".