rpi-implement

name	rpi-implement
description	Execute an approved plan from .rpi/plans phase by phase with TDD and per-phase verification. Use when user says 'implement the plan', 'start implementing', 'run the next phase', or just approved a plan.

Implement Plan

Goal

Execute an active plan from .rpi/plans/ phase by phase. Plans come in two forms: pipeline plans (reference designs and research) or standalone plans (self-contained).

After all phases are complete and verified, announce completion and update the plan status. Then suggest → /rpi:rpi-verify <plan-path> for an independent verification report.

Invariants

• See the project's RPI Skill Contract for --ff semantics; the per-phase Under --ff, ... modifiers below describe how this skill implements that contract
• Validate the plan's status before starting — draft/active: proceed; complete: warn about duplication
• Resolve the plan's artifact chain and read all upstream context (designs, research, specs)
• Read all files mentioned in the plan fully — never use limit/offset
• Transition the plan to active status when starting
• Check current progress (completed vs remaining items) — resume from first unchecked item
• Pre-review: before writing code for a phase, present all intended changes for approval — flag any deviations from plan. Under --ff, skip the preview and write the changes directly.
• Red/green TDD: for new code, write tests first (confirm they fail), then implement until they pass
• Run success criteria checks after each phase — fix issues before proceeding
• Update checkboxes in the plan file as items complete
• Before committing: scan staged files for sensitive content — warn and exclude if flagged
• Before committing: scan staged files against .gitignore rules — warn and silently drop any matches from the stage list (commonly: plan, design, research, diagnosis, or review artifacts under the default tracked-specs policy)
• Auto-commit: after each phase passes its checks, commit automatically without manual confirmation — use descriptive messages matching repo style
• After hook failure: read error, fix the issue, re-stage, create a new commit (never amend)
• If a phase's success criteria are fully covered by automated checks (tests, linting, etc.), run them and proceed automatically when they pass — only pause for manual verification when the plan includes manual verification items not covered by automated tests. Under --ff, skip manual verification pauses too — mark unverified items as [unverified — --ff] in the plan checkbox text.
• On mismatch: stop, present what the plan says vs what you found, ask how to proceed
• Context recovery: if context seems lost or you're unsure which phase you're on, call the context essentials tool to restore your implementation context
• On completion: verify spec conformance for all linked specs — extract scenarios using the verify spec tool, then check each scenario against actual code and tests; plan → complete
• Under --ff, after the plan transitions to complete, invoke /rpi:rpi-verify <plan-path> via the Skill tool as the chain's terminal step.

Principles

• Follow the plan's intent while adapting to what you find — your judgment matters
• Implement each phase fully before moving to the next
• Trust completed checkmarks when resuming — verify only if something seems off

Recommended model: premium tier, medium effort — executing a fixed plan; correctness matters, the search space is bounded. Advisory; see docs/model-routing.md.