Sdd Workflow

Spec-Driven Development Workflow (TTA.dev)

No implementation code may be written before completing the SDD phases.

The 4 Phases

Execute these phases sequentially. No phase may be skipped.

1. /specify — Functional Specification (The "What")

   • User journeys, edge cases, success criteria, out-of-scope
   • Output: Markdown document for user review and approval

2. /plan — Technical Plan (The "How")

   • Which packages are affected (tta-dev-primitives, tta-observability-integration, etc.)
   • New modules, classes, functions to create
   • How the feature composes with existing primitives (>>, |)
   • External dependencies with justification
   • Observability strategy (traces, metrics, logs)

3. /tasks — Task Breakdown

   • Isolated, testable work units
   • Each task includes acceptance test description
   • Numbered by dependency (topological sort)
   • Format: Markdown checklist

4. /implement — Test-Driven Implementation

   • Red: Write failing test encoding acceptance criteria
   • Green: Minimal implementation to pass the test
   • Refactor: Clean up while tests stay green
   • Run quality gate before marking task complete

Exceptions

• /spike: User explicitly requests prototype code. Spike code must never be merged without going through the full SDD workflow afterward.

Enforcement

• If the user asks for code without a spec, initiate /specify first and explain the SDD process.
• Reference this process by phase (e.g., "Per Phase 1, I need to generate a spec first.").

Deep Reference

For the complete SDD Constitution with all tables and detailed guidance, see docs/agent-guides/sdd-constitution.md.