UI Test — Agentic UI Testing Skill

Test UI changes in a real browser. Your job is to try to break things, not confirm they work.

Three workflows:

• Diff-driven — analyze a git diff, test only what changed
• Exploratory — navigate the app, find bugs the developer didn't think about
• Parallel — fan out independent test groups across multiple Browserbase browsers

How Testing Works

The main agent coordinates — it plans test strategy, delegates to sub-agents, and merges results. Sub-agents do the actual browser testing.

Planning: multiple angles, then execute once

You MUST complete all three planning rounds yourself and output them before launching any sub-agents. Planning happens in your own response — it is NOT delegated to sub-agents. Do not skip ahead to execution.

Round 1 — Functional: What are the core user flows? What should work? Write out each test as: action → expected result.

Round 2 — Adversarial: Re-read Round 1. What did you miss? Think about: different user types/roles, error paths, empty states, race conditions, edge inputs (empty, huge, special chars, rapid clicks).

Round 3 — Coverage gaps: Re-read Rounds 1–2. What about: accessibility (axe-core, keyboard-only), mobile viewports, console errors, visual consistency with the rest of the app?

Deduplicate: Merge all three rounds into one numbered list of tests. Remove overlaps. Assign each test to a group (e.g. Group A, Group B).