task-implementationlisted

# Task Implementation Skill Executes the approved plan during the `implementation` stage (and applies fixes during `review_fixes`). One step at a time, validated before marked done. ## When to Use - Stage `implementation`: next non-completed plan step. - Stage `review_fixes`: applying validated Codex findings (the codex-review skill decides *what*; this skill governs *how* edits are made and validated). ## Inputs - `TASK_PLAN.md` (authoritative step list and statuses). - Workflow state (aggregate counts, blockers). - The repository. ## Outputs - Implemented, validated changes; step statuses updated in the plan; state counts synced (`total_steps` / `completed_steps` / `blocked_steps`). - `.claude/implementation-summary.md` (template: `templates/review/IMPLEMENTATION_SUMMARY.md`) when all steps complete. ## Procedure Per-step loop: [references/implementation-loop.md](references/implementation-loop.md). Validation rules: [references/step-validation.md](references/step-validation.md). Gate before review: [references/completion-gate.md](references/completion-gate.md). ## Preconditions - Stage is `implementation` or `review_fixes`; plan validates. ## Stopping Conditions - All steps `Completed` and the completion gate passes → hand to the codex-review skill (`review` action). - A step blocks → record it (plan + `state blocker add`), keep stage `implementation`, report to the user. Do not continue past a blocking dependency. ## Prohibited - Marking a step