tdd-test-writer

Writes failing tests first, establishing a strict implementation contract for test-driven development. Use this skill to complete the RED phase of TDD: define behavior with tests first, verify they fail for the right reason, then hand off implementation with objective pass criteria. Use this skill when the user asks for: Return a block that implementation agents must follow. The handoff must include: - Completes the RED phase of TDD by authoring behavior-focused tests that fail for the right reason, then hands off to implementation agents with objective pass criteria - Delegates test authoring to a tdd_test_writer subagent when available, ensuring tests remain unmodified during implementation - Detects existing test frameworks and conventions (pytest, jest, vitest, go test, cargo test) and follows repository patterns for consistency - Produces a structured handoff block specifying exact test files, verification commands, failure summaries, and immutable test constraints that implementation agents must satisfy without weakening tests - Supports bugfix workflows by adding regression tests that capture the reported failure mode before code changes - test-first development - TDD / RED-GREEN-REFACTOR workflow - writing tests that implementation agents must satisfy - bugfixes that need regression tests before code changes - Do not modify production code while running this skill. -...