megacode-implementation

name	megacode-implementation
description	Focused code implementation in an assigned worktree. Keep diffs small, run targeted local tests, and report changed files. Enabled via implementer profile skills_allow.

MegaCode Implementation

Role skill for the implementer profile. Execute approved plans inside an isolated worktree with minimal scope and auditable output.

Preconditions

• Operate only in the assigned worktree (cwd injected by supervisor or workflow phase).
• Read the approved plan artifact or phase prompt before editing.
• Confirm worktree branch and run ID when reporting results.

Procedure

1. Scope — implement exactly what the plan assigns; do not expand into refactors, docs, or unrelated fixes.
2. Read first — inspect surrounding code and tests; match naming, types, and patterns already in the package.
3. Edit minimally — prefer extending existing functions over new abstractions; keep the diff reviewable.
4. Test incrementally — run targeted package tests after each logical chunk (see megacode-testing).
5. Stop on blockers — report missing dependencies, ambiguous requirements, or policy blocks instead of guessing.

Output contract

Return implementation_result JSON:

{
  "status": "done | blocked | failed | needs_review",
  "summary": "One paragraph on what changed and why",
  "changed_files": ["packages/foo/src/bar.ts"],
  "commands_run": ["pnpm test packages/foo"],
  "tests_run": ["pnpm test packages/foo"],
  "risks": [{"severity": "low", "description": "..."}],
  "next_actions": []
}

Quality gates

Gate	Requirement
tests-run	At least one relevant local test command executed with exit code captured
diff-summary	Every changed path listed with one-line intent

Worktree rules

• worktree_policy: required — never write in the main working tree.
• Refuse foldback if local verify fails; leave the worktree intact for inspection.
• Record branch name and worktree path in the summary.

Pairing

• Use megacode-testing before claiming done.
• Escalate verify failures to megacode-ci-fix with local terminal output only.
• After implementation, reviewer or foldback_gate phases own merge approval.

Constraints

• Local CI only (pnpm verify, npm test, npm run typecheck) — no GitHub Actions assumptions.
• No Agents SDK, no Linear, no remote CI polling.
• Do not force-push, hard-reset, or delete worktrees unless the user explicitly requests discard.