Fast Agent skill for Codex
Code, Build and Evaluate agents - excellent Model and Skills/MCP/ACP/A2A Support
How to install Fast Agent in Codex
In Codex, ask the built-in skill installer for it:
$skill-installer install the <skill> skill from https://github.com/evalstate/fast-agentType this in Codex and replace <skill> with a folder name from 'What it contains'. $skill-installer is the skill installer built into Codex, and it downloads the skill from GitHub. Restart Codex if the skill doesn't show up. Check the repo README for any setup it needs. Source: Codex skills docs.
Or copy the skill folder (the one with SKILL.md) into ~/.agents/skills to use it in every project, or into .agents/skills in a repo to share it with that repo. Codex picks up new skills automatically. (where Codex loads skills)
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What it contains
Skills (3)
fast-agent-system— Use this skill to generate well-branded interfaces and assets for fast-agent, either for production or throwaway prototypes/mocks/etc. Contains essential design guidelines, colors, type, fonts, assets, and UI kit components for protoyping.pr-writing-review— Extract and analyze writing improvements from GitHub PR review comments. Use when asked to show review feedback, style changes, or editorial improvements from a GitHub pull request URL. Handles both explicit suggestions and plain text feedback. Produces…session-investigator— Investigate fast-agent session and history files to diagnose issues. Use when a session ended unexpectedly, when debugging tool loops, when correlating sub-agent traces with main sessions, or when analyzing conversation flow and timing. Covers session.json…
About this listing
Fast Agent is a community collection of agent skills on GitHub by evalstate: folders with a SKILL.md file, the format Codex loads skills from. Its README mentions Codex. It passed the CodexStacks quality filter for skills (at least 100 stars, pushed in the last 90 days, not a fork or a list, and at least one SKILL.md with a name and description). OpenAI hasn't reviewed it, but it passed our Codex install check on Oct 29, 2026 (an install and load check, not a code review). From its files we found 3 skills. It's one of 441 listings in the Developer Tools category (category assigned by CodexStacks from the repo's topics and description).
Fast Agent FAQ
How do I install Fast Agent in Codex?
In Codex, type $skill-installer install the <skill> skill from https://github.com/evalstate/fast-agent. $skill-installer is the skill installer built into Codex (Codex skills docs). Or copy the skill folder (the one with SKILL.md) into ~/.agents/skills to use it in every project, or into .agents/skills in a repo to share it with that repo. Codex picks up new skills automatically.
Is Fast Agent an official Codex skill?
No. Fast Agent is a community repo on GitHub by evalstate. It passed the CodexStacks quality filter, but OpenAI hasn't reviewed it, but it passed our Codex install check on Oct 29, 2026 (an install and load check, not a code review), so read the code before you install it.
What does Fast Agent include?
From its manifest and repo files, Fast Agent includes 3 skills: fast-agent-system, pr-writing-review, session-investigator.
Details
- Type
- Skill
- Category
- Developer Tools (assigned by us)
- Source
- Community
- Author
- evalstate
- License
- Apache-2.0
- GitHub stars
- 3,951 (at last sync)
- Last push
- 2026-10-29
- GitHub topics
- a2a, acp, agent, agent-framework, cli, mcp, mcp-client, mcp-server, python, tui
- Source
- https://github.com/evalstate/fast-agent
- Website
- https://fast-agent.ai
- Listed via
- GitHub search: Codex skills (SKILL.md)
- Install check by CodexStacks
- Passed on Oct 29, 2026 with Codex CLI 0.163.0: Codex loaded its skills. proof · how we check
Something wrong or missing? Submit or improve this listing. Listings also refresh automatically every night.
For maintainers: badge and embeds
Maintain Fast Agent? Add the badge; it links to this page.
Markdown
[](https://codexstacks.com/p/fast-agent/)HTML
<a href="https://codexstacks.com/p/fast-agent/"><img src="https://codexstacks.com/badge.svg" alt="Listed on CodexStacks" width="172" height="28"></a>Embed card (static HTML and inline CSS, no JavaScript). Preview:
<a href="https://codexstacks.com/p/fast-agent/" style="display:block;max-width:380px;box-sizing:border-box;padding:14px 16px;border:1px solid #3a2c26;border-radius:12px;background:#0d0b0a;color:#f3ece6;font:14px/1.45 -apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;text-decoration:none"><span style="display:block;font-size:16px;font-weight:700;color:#f3ece6">Fast Agent</span><span style="display:block;margin:2px 0 8px;font-size:12px;color:#b5a9a1">Community Codex skill · 3 skills</span><span style="display:block;margin:0 0 10px;color:#ddd3cc">Code, Build and Evaluate agents - excellent Model and Skills/MCP/ACP/A2A Support</span><span style="font-size:12px;font-weight:600;color:#ffb347">View on CodexStacks →</span></a>Markdown summary
**[Fast Agent on CodexStacks](https://codexstacks.com/p/fast-agent/)**: Community Codex skill with 3 skills.More on badges, embeds and keeping your listing up to date: CodexStacks for plugin authors.
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