Codex Architect

by sd0xdev

Codex Architect 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

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agent-harnessclaude-codeclaude-code-plugincodexharness-engineeringskills

Install in seconds

Install Codex Architect

Copy Codex Architect 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-architect ~/.claude/skills/codex-architect

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

What Codex Architect does

Codex Architect provides architecture advice, design recommendations, and comparison guidance for feature planning or evaluating solutions. Use it for second opinions on technical design, not implementation or code review.

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

Documentation

README

Excerpt

Codex Architect Skill (Third Brain)

Trigger

Keywords: architecture design, solution evaluation, tech selection, third brain, Codex advice, design consulting, ask Codex, second opinion

When NOT to Use

Code implementation (use /codex-implement)
Code review (use /codex-review)
Deep discussion/exhaustive exploration (use /codex-brainstorm)

Usage

/codex-architect "<question>"
/codex-architect "Evaluate this design" --context src/xxx.ts --mode review
/codex-architect "Redis vs MongoDB?" --mode compare

Modes

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

Commands Codex Architect provides

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

/codex-implement
/codex-review
/codex-brainstorm
/codex-architect
/tech-spec
/review-spec
/codex-review-fast

Frequently asked about Codex Architect

What else does sd0xdev publish alongside Codex Architect?
Codex Architect 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 Architect 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 Architect compare to other AI Engineering skills?
Codex Architect ranks #2966 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 Architect against them. Open each page to compare what they document and how they install.