/implement-spec-with-codex

name: implement-spec-with-codex
description: Run [implement-spec](../implement-spec/SKILL.md) with Codex doing the implementation passes while you orchestrate, integrate, and review. Use when the user asks to implement a spec with Codex, or to run implement-spec with Codex as the implementer.

Implement Spec with Codex

Run [implement-spec](../implement-spec/SKILL.md) exactly — same loop, same gates, same maintenance checkpoints — but Codex writes the code. Invoking this skill IS the explicit ask that authorizes `codex exec` delegation under the [codex](../codex/SKILL.md) skill.

Role split

• **Codex implements — whenever possible.** Default every implementation pass

to a `codex exec`, sliced sharp and prompted per the codex skill (prompt blocks, sandbox choice, exec liveness). Run independent slices as concurrent execs in separate worktrees, exactly where implement-spec would fan out subagents.

• **You orchestrate and review.** The spec loop stays yours: pick the next

slice, reconcile plan with code, author each prompt end-to-end, integrate diffs, run the gates, review the merged tree, commit, update the handoff, run maintenance checkpoints. None of that delegates.

Keep a pass yourself only when slicing it sharply would cost more than doing it — tiny fixups, plan reconciliation, integration conflicts.

Rules

• You own every result: read the full diff and run the verification yourself.

"Codex says it's done" is never done.

• Visual results carry implement-spec's two extra proofs (production-route

pixel diff + unprimed critique) with double force here: a sandboxed Codex never saw its change render, so a pass that misses the production render path entirely arrives looking fully "verified".

• A sandboxed Codex ships code it never saw run — browser-verify every visual

slice yourself and budget fix rounds. Send a red gate back as a resumed follow-up with the failing evidence; fix it yourself only when that's smaller than re-prompting.

• Commit hygiene stays yours: review the change list of the merged tree

before every commit, exactly as implement-spec demands of the integrating reviewer.