Codex Retrospective

Codex Retrospective is an AI Engineering skill for Claude Code, published by majiayu000 in spellbook.

265 stars26 forkson majiayu000/spellbookAdded 2026/09/02+1% in starsRepository updated 2026/08/31

agent-skillsai-agent-skillsai-agentsai-coding-assistantautomationclaudeclaude-codeclaude-code-skillscode-reviewcodexcodex-skillscross-runtimedeveloper-toolsmulti-agentproductivityprompt-engineeringskill-librarysoftware-developmentspellbookworkflows

Install in seconds

Install Codex Retrospective

Copy Codex Retrospective 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/majiayu000/spellbook/tree/main/skills/codex-retrospective ~/.claude/skills/codex-retrospective

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/majiayu000/spellbook.git

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

In this catalog

Source file: skills/codex-retrospective/SKILL.md in majiayu000/spellbook
Installs to: ~/.claude/skills/codex-retrospective
Collection: One of 25 skills cataloged from this repository
Category: AI Engineering — 2631 skills

What Codex Retrospective does

Codex Retrospective reviews recent session history to find repeated friction and propose minimal AGENTS.md updates or tiny reusable skills. Use it after recurring mistakes or on a weekly or monthly retrospective.

Codex Retrospective is cataloged under AI Engineering on DirSkills. Codex Retrospective comes from a repository tagged agent-skills, ai-agent-skills, ai-agents, ai-coding-assistant and automation.

Documentation

README

Excerpt

Codex Retrospective

A structured self-improvement loop for Codex.

This skill turns Codex from a one-off collaborator into a system that gets meaningfully better at working with you over time by systematically eating its own usage history.

Why This Exists

Most people improve their agent usage by manually maintaining AGENTS.md or skills when they notice problems. This skill makes that process deliberate, regular, and high-leverage.

It is directly inspired by strong practices from heavy users (especially Greg Brockman's emphasis on updating the "constitution" from real failures and friction), but executed as a repeatable arsenal-style workflow.

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

Frequently asked about Codex Retrospective

What else does majiayu000 publish alongside Codex Retrospective?
Codex Retrospective is one of 25 skills that DirSkills catalogs from majiayu000/spellbook, the repository it ships in. Its siblings there include AGENTS.md Scaffold, API Design and Agents Md Optimize. Each one is a separate skill with its own page in this directory, installs the same way Codex Retrospective does, and is maintained by majiayu000 in that same repository. The rest of the collection is listed on the majiayu000/spellbook page.
How does Codex Retrospective compare to other AI Engineering skills?
Codex Retrospective ranks #2235 by stars among the 2631 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 Retrospective against them. Open each page to compare what they document and how they install.