rustack

Polish and expand the relevant feature specs first, then implement one phase of the project impl plan end-to-end with high quality bars (correctness, elegance, performance), and run an independent code review against the polished specs before declaring done. Use whenever the user says "build phase N", "implement the next phase", "land M0/M1/M2/M3", "follow the impl plan", "ship phase X entirely", "based on specs think ultra hard and build phase X", or asks for a phase-shaped slice of the spec set. Trigger even when the user does not say "impl" if they reference an impl plan / roadmap milestone and ask Codex to build it.

Turn a feature idea or rough requirement into a complete, dependency-ordered spec set under ./specs — PRD, component designs, glossary, security/perf/test cross-cuts, key-decisions log, stakeholder roadmap, and engineer-facing implementation plan — cross-referenced with prior-art memos in ./docs/research and vendored code in ./vendors. Use whenever the user says "write the spec", "design this", "let's plan X", "produce a PRD / impl plan / roadmap", "restructure the specs", "review and re-organise the design", "think ultra hard and split this into phases", or describes a non-trivial system that needs a written design before code. Trigger even when the user does not say "spec" if they ask for phased delivery, milestone exit criteria, or a build-order graph.

Implement one phase of ./specs/91-impl-plan.md end-to-end with high quality bars (correctness, elegance, performance), then run an independent code review against the relevant specs and fix every valid finding before declaring done. Use whenever the user says "build phase N", "implement the next phase", "land M0/M1/M2/M3", "follow the impl plan", "ship phase X entirely", "based on @specs/91-impl-plan.md think ultra hard and build phase X", or asks for a phase-shaped slice of the spec set. Trigger even when the user does not say "impl" if they reference an impl plan / roadmap milestone and ask Claude to build it.

Turn a feature idea or rough requirement into a complete, dependency-ordered spec set under ./specs — PRD, component designs, glossary, security/perf/test cross-cuts, key-decisions log, stakeholder roadmap, and engineer-facing implementation plan — cross-referenced with prior-art memos in ./docs/research and vendored code in ./vendors. Use whenever the user says "write the spec", "design this", "let's plan X", "produce a PRD / impl plan / roadmap", "restructure the specs", "review and re-organise the design", "think ultra hard and split this into phases", or describes a non-trivial system that needs a written design before code. Trigger even when the user does not say "spec" if they ask for phased delivery, milestone exit criteria, or a build-order graph.