tdd

Sprint 3 composable skill. Wraps the existing TDD-engineer phase with addyosmani-style structure. Mandatory hop before build.

When to invoke

• After plan-review returns PROCEED, OR after Scout if plan-review disabled
• Before any new feature implementation
• Before any bug fix (write a regression test first)

When NOT to invoke

• Eval-only cycles (no implementation needed)
• Pure documentation cycles
• Refactor cycles where existing tests provide coverage (verify first)

Workflow

Step	Action	Exit criteria
1	Read scout-report.md and plan-review.md	Inputs verified
2	Write RED tests (must fail on current code)	Tests exist; running them fails
3	Document the test contract in <workspace>/tdd-contract.md	Contract written
4	Append section to <workspace>/team-context.md	Bus updated for Builder

RED requirement

Tests MUST fail when run against the current codebase. A test that passes immediately is NOT a TDD contract — it does not exercise the new behavior. Builder will refuse to start without confirmed RED state.

Handoffs (beyond the contract artifact)

• <workspace>/tdd-contract.md with sections: ## Tests Written, ## RED Verification, ## Contract for Builder
• New/modified test files in the repo (Builder reads these)
• <workspace>/team-context.md has populated ## TDD Contract section

Phase facts

Fact	Value
Phase	tdd (plan archetype, optional, gated by workflow.phase_enables.tdd=on)
Persona	agents/evolve-tdd-engineer.md
Profile	.evolve/profiles/tdd-engineer.json — CLI claude-tmux, tier balanced, single-writer
Inputs	scout-report.md · plan-review-report.md
Artifact	test-report.md (cycle workspace)

Output contract

test-report.md must declare:

• ## AC-Materialization (also accepted: ## Acceptance, ## Coverage Map)
• ## RED Run Output (also accepted: ## RED Tests, ## Test Files Written)

Composition

Invoked by:

• /evo:tdd
• loop macro after plan-review (or after discover when plan-review off)

Reference

• agents/evolve-tdd-engineer.md (persona definition)
• .evolve/profiles/tdd-engineer.json
• CLAUDE.md "Evolve Loop Task Priority" section