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msd-core/docs/features/nyquist-validation.md
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15 Nyquist Validation Quality Assurance Features

Purpose: Map automated test coverage to phase requirements before any code is written. Named after the Nyquist sampling theorem — ensures a feedback signal exists for every requirement.

Requirements:

  • REQ-NYQ-01: System MUST detect existing test infrastructure during plan-phase research
  • REQ-NYQ-02: System MUST map each requirement to a specific test command
  • REQ-NYQ-03: System MUST identify Wave 0 tasks (test scaffolding needed before implementation)
  • REQ-NYQ-04: Plan checker MUST enforce Nyquist compliance as 8th verification dimension
  • REQ-NYQ-05: System MUST support retroactive validation via /msd-validate-phase
  • REQ-NYQ-06: System MUST be disableable via workflow.nyquist_validation: false

Produces: {phase}-VALIDATION.md — Test coverage contract

Retroactive Validation (/msd-validate-phase [N]):

  • Scans implementation and maps requirements to tests
  • Identifies gaps where requirements lack automated verification
  • Spawns auditor to generate tests (max 3 attempts)
  • Never modifies implementation code — only test files and VALIDATION.md
  • Flags implementation bugs as escalations for user to address