Validate built features through conversational testing with persistent state.

Purpose: Confirm what Claude built actually works from user's perspective. One test at a time, plain text responses, no interrogation. When issues are found, automatically diagnose, plan fixes, and prepare for execution.

Output: {phase_num}-UAT.md tracking all test results. If issues found: diagnosed gaps, verified fix plans ready for /gsd-execute-phase

<execution_context> @/.claude/gsd-core/workflows/verify-work.md @/.claude/gsd-core/templates/UAT.md </execution_context>

Phase: $ARGUMENTS (optional) - If provided: Test specific phase (e.g., "4") - If not provided: Check for active sessions or prompt for phase

Context files are resolved inside the workflow (init verify-work) and delegated via <required_reading> blocks.

Execute end-to-end. Preserve all workflow gates (session management, test presentation, diagnosis, fix planning, routing).