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Agent skill

Implement Spec With Codex

by dzhng in dzhng/skills

Run [implement-spec](../implement-spec/SKILL.md) with Codex doing the implementation passes while you orchestrate, integrate, and review.

MITAuto-check passed

Install Implement Spec With Codex

skills CLI
$ npx skills add dzhng/skills --skill implement-spec-with-codex -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install dzhng/skills implement-spec-with-codex --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/dzhng/skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/engineering/implement-spec-with-codex .claude/skills/implement-spec-with-codex && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
implement-spec-with-codex
GitHub stars
1k
Used in
1 other repo
Token cost
~543 tokens
SKILL.md length
263 words
Files
1
Skills in repo
27
Repo updated
First seen
Licence
MIT

At a glance

Run [implement-spec](../implement-spec/SKILL.md) with Codex doing the implementation passes while you orchestrate, integrate, and review.

  • The user asks to implement a spec with Codex
  • SKILL.md covers Role split and Rules
  • Calls codex
  • Run implement-spec with Codex as the implementer

What it does

Implement Spec With Codex is an agent skill from dzhng/skills. 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.

Its SKILL.md is about 540 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

The repository describes itself as: Reusable AI agent skills for software factories: explore ideas, write specs, implement, review, and run autonomous research. Works with Claude Code, Codex, and other… The licence is MIT.

When your agent uses it

  • The user asks to implement a spec with Codex
  • Run implement-spec with Codex as the implementer

Example prompts

  • “/implement-spec-with-codex”

What it can do on your machine

Read from SKILL.md and the folder at commit d513228. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • codex

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Implement Spec With Codex loads about 543 tokens when it runs. Until then it costs about 69 tokens; SKILL.md has 263 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~69
When it runs · the whole SKILL.md, loaded when a task matches
~543

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from dzhng/skills at commit d513228, republished under its MIT licence (© dzhng). 263 words, ~543 tokens.

Download SKILL.mdSave it as .claude/skills/implement-spec-with-codex/SKILL.md (or your agent's skills folder).
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 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 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.

© dzhng, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/engineering/implement-spec-with-codex of dzhng/skills.

Open the folder on GitHubat commit d513228

Used in 2 other repositories

We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in dzhng/skills, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Implement Spec With Codex next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Implement Spec With Codex compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Implement Spec With Codex this skilldzhng/skills1k1 repos~543Automated safety check: PassMIT
Implementsickn33/agentic-awesome-skills47k5 repos~306Automated safety check: PassMIT
Implementcodewhale-hq/Codewhale41k—~190Automated safety check: PassMIT
Incremental Implementationaddyosmani/agent-skills103k1 repos~2.3kAutomated safety check: PassMIT
Implementbestofjs/bestofjs3.1k18 repos~109Automated safety check: PassMIT
ImplementAutomattic/simplenote-android1.9k—~1.1kAutomated safety check: PassGPL-2.0

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Questions about Implement Spec With Codex

What does Implement Spec With Codex do?

Run [implement-spec](../implement-spec/SKILL.md) with Codex doing the implementation passes while you orchestrate, integrate, and review. Implement Spec With Codex is an agent skill from dzhng/skills.md) with Codex doing the implementation passes while you orchestrate, integrate, and review.

When should I use Implement Spec With Codex?

Implement Spec With Codex fits situations like: the user asks to implement a spec with Codex; run implement-spec with Codex as the implementer.

How do I install Implement Spec With Codex in Claude Code?

Run `npx skills add dzhng/skills --skill implement-spec-with-codex -a claude-code`. Or copy the skill folder (skills/engineering/implement-spec-with-codex in dzhng/skills) into .claude/skills/implement-spec-with-codex in your project. Claude Code loads it when a task matches its description.

How do I install Implement Spec With Codex in Codex?

Run `npx skills add dzhng/skills --skill implement-spec-with-codex -a codex`. Or copy the skill folder (skills/engineering/implement-spec-with-codex in dzhng/skills) into .agents/skills/implement-spec-with-codex in your project. Codex loads it when a task matches its description.

Can I use Implement Spec With Codex in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add dzhng/skills --skill implement-spec-with-codex -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/implement-spec-with-codex, .gemini/skills/implement-spec-with-codex, .github/skills/implement-spec-with-codex and .opencode/skills/implement-spec-with-codex in your project.

What does Implement Spec With Codex need to run?

Going by SKILL.md and its folder, Implement Spec With Codex needs the command-line tools its instructions call (codex).

Does Implement Spec With Codex access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Implement Spec With Codex safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Implement Spec With Codex use?

Implement Spec With Codex is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Implement Spec With Codex use?

About 543 tokens (SKILL.md is roughly 2.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Implement Spec With Codex?

Skills that share tags, products or a category with Implement Spec With Codex: Implement (sickn33/agentic-awesome-skills, 47k stars), Implement (codewhale-hq/Codewhale, 41k stars), Incremental Implementation (addyosmani/agent-skills, 103k stars) and Implement (bestofjs/bestofjs, 3.1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Implement Spec With Codex?

dzhng (a GitHub user) maintains it in dzhng/skills, which has 1,016 GitHub stars. The repository holds 27 skills in this directory. The repository was last updated on October 5, 2026.

Source: dzhng/skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.