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frontend-browser-review

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by langfuse · part of langfuse/langfuse

Use this skill when a change affects what users see or do in the browser.

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🔒 Repo-maintenance skill. It exists to help maintain langfuse/langfuse itself — it's only useful if you contribute code to that project.

This is the playbook your agent receives when the skill activates — you don't need to read it to use the skill, but it's here to audit before installing.

by langfuse

Use this skill when a change affects what users see or do in the browser. npx skills add https://github.com/langfuse/langfuse --skill frontend-browser-review Download ZIPGitHub30.4k

Frontend Browser Review

Use this skill when a change affects what users see or do in the browser.

Start Here

  • Read ../../../web/AGENTS.md for web-specific entry points and test commands.

  • Use the workspace playwright MCP server configured from the repo-owned shared agent setup.

When To Use It

  • UI changes in web/**

  • Layout, styling, or responsive behavior changes

  • Changes to navigation or page flows

  • Bug fixes where the failure mode is visible in the browser

  • Final signoff for user-visible frontend work

Prefill Test Data First

Most flows are only reviewable against meaningful data. Before opening the browser, seed what the flow needs with the seed CLI (see the seed-test-data skill for the need→command table):

  • pnpm run seed -- trace-tree --observations 5000 --v4 — complex observation trees (v3 + v4 events)

  • pnpm run seed -- long-session --traces 300 — heavy session views

  • pnpm run seed -- many-traces --count 100000 — list/filter performance

  • pnpm run seed -- doctor — when the stack misbehaves

Every run prints UI deep links — open those instead of navigating manually. Do not hand-write seed scripts or raw ClickHouse inserts.

Review Loop

  • Start the app with pnpm run dev:web unless an existing local server is already running.

  • Install Chromium with pnpm run playwright:install if Playwright has not been set up on the machine yet.

  • Open the primary changed flow with the Playwright MCP server, using the deep links printed by the seed CLI when the flow needs seeded data.

  • Exercise the main happy path affected by the change.

  • Check for obvious visual regressions:

  • broken layout or spacing

  • banner overlap or viewport anchoring issues

  • missing loading, empty, or error states

  • broken responsive behavior on narrow widths

  • If the page changed materially, inspect the resulting UI state and compare it against the intended behavior from the task or existing patterns.

  • If the browser session fails, inspect traces and artifacts under /tmp/playwright-mcp.

Output Expectations

Report:

  • What flow you reviewed

  • Whether the primary flow worked

  • Any visible regressions or follow-up risks

  • If review was blocked, exactly what prevented browser verification

Scope Notes

  • This skill complements, not replaces, targeted tests and linting.

  • For implementation details, stay in web/AGENTS.md and package-local skills.

  • Use this as the browser-signoff workflow, not as a generic frontend coding guide.