Codex Implement

by sd0xdev

Codex Implement is an AI Engineering skill for Claude Code, published by sd0xdev in sd0x-harness.

188 stars24 forkson sd0xdev/sd0x-harnessAdded 2026/09/06Repository updated 2026/09/05

View source on GitHub Download repo ZIP

agent-harnessclaude-codeclaude-code-plugincodexharness-engineeringskills

Install in seconds

Install Codex Implement

Copy Codex Implement into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/sd0xdev/sd0x-harness/tree/main/skills/codex-implement ~/.claude/skills/codex-implement

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/sd0xdev/sd0x-harness.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: skills/codex-implement/SKILL.md in sd0xdev/sd0x-harness
Installs to: ~/.claude/skills/codex-implement
Collection: One of 25 skills cataloged from this repository
Category: AI Engineering — 3278 skills

What Codex Implement does

Codex Implement writes features from a spec, then runs a review loop to confirm the result. Use it for new code, Codex-driven development, and changes that should be implemented rather than reviewed or architected.

Codex Implement is cataloged under AI Engineering on DirSkills. Codex Implement comes from a repository tagged agent-harness, claude-code, claude-code-plugin, codex and harness-engineering.

Documentation

README

Excerpt

Codex Implement Skill

Trigger

Keywords: codex implement, implement feature, codex write code, implement from spec

When NOT to Use

Architecture advice only (use /codex-architect)
Code review (use /codex-review-fast)
Bug fix (use /bug-fix)
Simple one-line change (edit directly)

Workflow

Parse args → Decompose → Collect context → Iterate items → Review loop → Done
                                              ↕
                                    codex → diff → confirm
                                              ↕
                                    reject/modify → § Resume

Step 0: Pre-check and precondition (before any repository read)

This is the opening of the README. Read the full README on GitHub.

Commands Codex Implement provides

Slash commands named in this skill’s SKILL.md, listed in the order they first appear.

/codex-architect
/codex-review-fast
/bug-fix

Frequently asked about Codex Implement

What else does sd0xdev publish alongside Codex Implement?
Codex Implement is one of 25 skills that DirSkills catalogs from sd0xdev/sd0x-harness, the repository it ships in. Its siblings there include Adr, Architecture Design and Ask. Each one is a separate skill with its own page in this directory, installs the same way Codex Implement does, and is maintained by sd0xdev in that same repository. The rest of the collection is listed on the sd0xdev/sd0x-harness page.
How does Codex Implement compare to other AI Engineering skills?
Codex Implement ranks #2972 by stars among the 3278 AI Engineering skills in this catalog. The most-starred ones next to it are Architecture Decision Records, AI-First Engineering and Agentic OS. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of Codex Implement against them. Open each page to compare what they document and how they install.