640 Skills for Codex

CommunitySkillDeveloper Tools

Agent Skills for Solopreneurs & Teams.

How to install 640 Skills in Codex

In Codex, ask the built-in skill installer for it:

$skill-installer install the <skill> skill from https://github.com/KunoLu/640-skills

Type 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 (33)

  • sbtd-workflow-onboard — Checks, installs, resets, or explicitly upgrades and verifies selected SBTD workflow Skills, AGENTS and host configuration domains; plans and applies authorized legacy migrations and recovery; reconciles interrupted migration deployment evidence from current…
  • book-ddd-distilled-modeling — Guides lightweight domain modeling with ubiquitous language, bounded contexts, and subdomain focus. Always run after every completed grill-with-docs session as an independent second-pass boundary review; also use before PRD, design, or implementation when…
  • book-ddia-data-design — Guides data-intensive design checks for consistency, reliability, schema evolution, and data flow risks. In strict tasks, mandatory before design stabilizes or implementation begins when changing persisted/shared data, schemas, migrations…
  • book-legacy-change-safety — Guides safe changes to legacy or weakly tested code by characterizing behavior before editing. In strict tasks, mandatory before the first behavior-changing edit for existing-behavior bug fixes or existing code with unclear behavior, low coverage, hidden…
  • book-refactoring-pass — Guides behavior-preserving refactoring with small, reversible steps. In strict tasks, mandatory before the first implementation edit to existing production code; in default/lite tasks, use on demand when structural friction, duplication, long functions…
  • book-release-readiness — Reviews production readiness for services, APIs, jobs, queues, integrations, and deployment-sensitive changes. In strict tasks, mandatory after all applicable testing-tool gates and project validation, and before completion or release, when production-path…
  • gherkin-bdd — Use when adding, changing, reviewing, testing, synchronizing, or read-only ingesting user-visible behavior with BDD, Gherkin, Given/When/Then scenarios, .feature files, acceptance criteria, knowledge catalogs, or bug-fix behavior specs.
  • knowledge-base-integration — Use when configuring or running product-level Knowledge Ingest, target-ref Feature catalogs, Evidence Policy decisions, Revision Sets, idempotent smoke, or local/remote knowledge runners across repositories.
  • lessons-record — Use when a durable lesson is needed after a bug fix, rollback, tool or workflow mistake, structural-analysis mismatch, or lost multi-agent context; resolve the lesson writer identity without initializing the whole project.
  • maestro-mobile-e2e — Use when generating or running Maestro Mobile/Hybrid E2E flows, deriving Maestro YAML from BDD `.feature` scenarios, configuring Maestro report paths, or debugging Maestro iOS real-device runs.
  • project-validation — Use after code changes to choose and run validation commands for Node, JavaScript, TypeScript, Python, Go, Dart, Java, Kotlin, C++, Swift, or Objective-C projects. Prefer project-defined commands and report skipped checks and risks.
  • sbtd-task — Use for SBTD task execution and continuation, explicit default/lite/strict mode selection, task records and status changes, cross-session recovery, and task handoffs. Load strict gates only for strict tasks; ordinary questions and read-only work do not…
  • seo-geo — SEO & GEO (Generative Engine Optimization) for websites. Analyze keywords, generate schema markup, optimize for AI search engines (ChatGPT, Perplexity, Gemini, Copilot, Claude) and traditional search (Google, Bing). Use when user wants to improve search…
  • web-ui-autotest-generator — 从前端和后端源码中生成可维护的 Web UI 自动化测试。适用于分析页面、路由、组件、接口、用户流程,生成 Playwright UI 测试,运行测试,生成中文报告,并自检页面功能和跨页面逻辑是否被独立测试资产覆盖。 Generate maintainable Web UI automated tests from frontend and backend source code. Use for analyzing pages, routes, components, APIs, and user…
  • codebase-design — Shared vocabulary for designing deep modules. Use when the user wants to design or improve a module's interface, find deepening opportunities, decide where a seam goes, make code more testable or AI-navigable, or when another skill needs the deep-module…
  • diagnosing-bugs — Diagnosis loop for hard bugs and performance regressions. Use when the user says "diagnose"/"debug this", or reports something broken/throwing/failing/slow.
  • domain-modeling — Build and sharpen a project's domain model. Use when discussing codebase terminology, writing or editing a GLOSSARY.md, or recording or editing an ADR.
  • grill-me — A relentless interview to sharpen a plan or design.
  • grill-with-docs — A relentless interview to sharpen a plan or design, which also creates docs (ADR's and glossary) as we go.
  • grilling — Grill the user relentlessly about a plan, decision, or idea. Use when the user wants to stress-test their thinking, or uses any 'grill' trigger phrases.
  • handoff — Compact the current conversation into a handoff document for another agent to pick up.
  • i-have-adhd — Shape output for a reader with ADHD: lead with the next action, number multi-step work, restate state across turns, suppress tangents, give specific time estimates, make wins visible. Invoke with /i-have-adhd; stays on until "stop adhd mode".
  • impeccable — Use when the user wants to design, redesign, shape, critique, audit, polish, simplify, harden, animate, or otherwise improve a frontend interface: websites, landing pages, dashboards, product UI, components, forms, settings, onboarding, empty states, and…
  • ponytail-audit — Quality audit of a whole repo: bugs, security holes, what breaks under real load, risky code without tests, slow paths, and what to delete, merge or split. Ranked, each finding explained in plain English. One-shot report, changes nothing. Use for "audit this…
  • ponytail-debt — List every `shortcut:` comment (and older `ponytail:` ones) as a debt ledger. One-shot report, changes nothing. Use for "ponytail debt", "what did ponytail defer", "list the shortcuts", /ponytail-debt.
  • ponytail-review
  • ponytail
  • shadcn
  • tdd — Test-driven development. Use when the user wants to build features or fix bugs test-first, mentions "red-green-refactor", or wants integration tests.
  • to-spec — Turn the current conversation into a spec and publish it to the project issue tracker: no interview, just synthesis of what you've already discussed.
  • to-tickets — Break a plan, spec, or the current conversation into a set of tracer-bullet tickets, each declaring its blocking edges, published to the configured tracker (edges as text in one file per ticket locally, or native blocking links on a real tracker).
  • ui-ux-pro-max — UI/UX design intelligence for web, mobile, and desktop. This skill should be used when designing, building, reviewing, or fixing interfaces, including pages, components, design systems, accessibility, interaction, responsive layout, typography, color…
  • writing-for-agents

About this listing

640 Skills is a community collection of agent skills on GitHub by KunoLu: 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 28, 2026 (an install and load check, not a code review). From its files we found 33 skills. It's one of 441 listings in the Developer Tools category (category assigned by CodexStacks from the repo's topics and description).

640 Skills FAQ

How do I install 640 Skills in Codex?

In Codex, type $skill-installer install the <skill> skill from https://github.com/KunoLu/640-skills. $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 640 Skills an official Codex skill?

No. 640 Skills is a community repo on GitHub by KunoLu. It passed the CodexStacks quality filter, but OpenAI hasn't reviewed it, but it passed our Codex install check on Oct 28, 2026 (an install and load check, not a code review), so read the code before you install it.

What does 640 Skills include?

From its manifest and repo files, 640 Skills includes 33 skills: sbtd-workflow-onboard, book-ddd-distilled-modeling, book-ddia-data-design, book-legacy-change-safety, book-refactoring-pass, book-release-readiness….

Details

Type
Skill
Category
Developer Tools (assigned by us)
Source
Community
Author
KunoLu
License
Apache-2.0
GitHub stars
556 (at last sync)
Last push
2026-10-29
Source
https://github.com/KunoLu/640-skills
Listed via
GitHub search: Codex skills (SKILL.md)
Install check by CodexStacks
Passed on Oct 28, 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.

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Listed on CodexStacks

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[![Listed on CodexStacks](https://codexstacks.com/badge.svg)](https://codexstacks.com/p/640-skills/)

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<a href="https://codexstacks.com/p/640-skills/"><img src="https://codexstacks.com/badge.svg" alt="Listed on CodexStacks" width="172" height="28"></a>

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<a href="https://codexstacks.com/p/640-skills/" 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">640 Skills</span><span style="display:block;margin:2px 0 8px;font-size:12px;color:#b5a9a1">Community Codex skill · 33 skills</span><span style="display:block;margin:0 0 10px;color:#ddd3cc">Agent Skills for Solopreneurs &amp; Teams.</span><span style="font-size:12px;font-weight:600;color:#ffb347">View on CodexStacks →</span></a>

Markdown summary

**[640 Skills on CodexStacks](https://codexstacks.com/p/640-skills/)**: Community Codex skill with 33 skills.

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