Test-Driven Development

Process skill — red → green microcycle. Tests at public interfaces only. Shared vocabulary → process-skill-composition.md.

References: anti-patterns.md · output.md · codebase-design.md.

Read research-basis.md only when you calibrate seam claims.

Entry gate

• Seam agreed with the user — public interface under test (Seam: header or explicit agreement).
• Slice in scope — path glob or module id shared with other active atoms when layered.
• If there is no agreed seam, stop and ask. Do not write production code or tests at private helpers only.

Non-negotiables