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name: tdd-workflow description: Use this skill for test-first implementation of new features, bug fixes, and refactors with RED-GREEN-REFACTOR discipline and explicit verification gates. version: 0.3.0 source: fork checksum: 1b54242d35974d22731943be036dd0e2e70504bd3681a2bf17d126bb54e92c27 updated_at: 2026-03-12T18:57:03+08:00 intent: tdd layer: quality

TDD Workflow Skill

Codex invocation: use $tdd-workflow ... or tdd-workflow: ...

Enforce test-first development with explicit phase gates and reproducible verification evidence.

Capabilities

• Translate requirements into testable behaviors before implementation.
• Enforce RED -> GREEN -> REFACTOR sequence.
• Generate unit/integration/e2e test plans by risk.
• Prevent implementation-first drift with phase gate checks.
• Output machine-readable status for pause/resume workflows.

Input Requirements

• goal (required): feature, bug fix, or refactor target.
• scope (required): files/modules allowed to change.
• risk_level (optional): low | medium | high.
• test_layers (optional): unit | integration | e2e.
• done_definition (required): objective completion criteria.

How to Use

$tdd-workflow Add refresh-token rotation for OAuth login
$tdd-workflow Fix race condition in cache invalidation path
$tdd-workflow Refactor order pricing module without behavior change

Routing Boundary

Use this skill when implementation has not started and you need strict test-first execution.

• Use $tdd-workflow for pre-implementation TDD flow.
• Use $test-gen for post-implementation backfill/regression tests.
• Use $verification-loop for repeated fix-verify cycles after failures.

Native Subagent Protocol (Codex)

Codex supports native subagents. Delegate with spawn_agent, coordinate with send_input, collect via wait_agent, and clean up with close_agent.

Minimal orchestration pattern:

spawn_agent -> send_input (optional) -> wait_agent -> close_agent

Fallback: if delegation is unavailable, execute the same phases sequentially in a single thread.

Workflow Phases

State file: .omc/state/tdd-workflow-state.json

Phase 0: Scope and Behaviors

• Convert goal into behavior statements (Given/When/Then).
• Identify edge cases and failure modes.
• Map each behavior to a test layer.

Exit criteria:

• Behavior list complete.
• Test layer mapping complete.

Phase 1: RED

• Write tests for target behaviors before production code edits.
• Run targeted tests and confirm expected failures.

Exit criteria:

• New tests fail for expected reason.
• Failure output captured.

Phase 2: GREEN

• Implement minimal code to satisfy failing tests.
• Re-run targeted tests until green.

Exit criteria:

• Targeted tests pass.
• No unrelated behavior changed.

Phase 3: REFACTOR

• Improve readability/structure while preserving behavior.
• Keep tests green after each small refactor step.

Exit criteria:

• All targeted tests remain green.
• Diff remains scoped to declared files.

Phase 4: VERIFY

Run broader quality gates:

omcodex test changed
npm run build
npm run lint
npm run test

Use project-native equivalents when scripts differ.

Exit criteria:

• Required checks pass.
• Residual risks documented.

Coverage and Risk Policy

• Do not enforce blanket 80% if repository threshold differs.
• For high risk paths, require regression assertions and negative-path tests.
• For refactors, require no behavior drift and strong snapshot/contract checks.

Output Contract

[TDD-WORKFLOW]
- goal
- scope
- risk_level

[RED]
- tests added
- expected failures observed

[GREEN]
- implementation summary
- targeted tests passed

[REFACTOR]
- cleanup summary
- behavior preservation evidence

[VERIFY]
- commands executed
- pass/fail summary
- remaining risks

[STATUS]
- phase: <scope|red|green|refactor|verify>
- result: <complete|blocked|in_progress>
- promise: <PROMISE tag>

Completion and Blocking Tags

• [PROMISE:TDD_WORKFLOW_COMPLETE]
• [PROMISE:TDD_WORKFLOW_BLOCKED]

Block when:

• tests cannot be executed in current environment
• failures are nondeterministic and cannot be stabilized
• required scope or acceptance criteria are missing

Cancellation and Resume

• Cancel with $cancel or stop/cancel.
• Persist state file and latest phase summary.
• Resume from last incomplete phase only.