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By agent · Codex

Codex skills: 1008 worth installing

Skills in the open SKILL.md format that Codex reads. Each one has a plain-language summary and the command to install it.

Installing a skill in Codex

$ npx skills add <author>/<skill> --agent codex

Replace the placeholder with the author and skill name from the skill's page. Start a new Codex session afterwards so the skill is picked up.

Skills for Codex

All skills

Blog Writing Guide

SentryOfficial

Writes and reviews technical blog posts to the standards and voice of the Sentry engineering blog.

WritingGitHub stars: 1kInstalls: 3.1k

Sentry Code Review

SentryOfficial

Reviews pull requests the way Sentry engineers do, covering security, performance, testing and design.

DevelopmentGitHub stars: 1kInstalls: 5.2k

Code Simplifier

SentryOfficial

Simplifies and refines code for clarity, consistency and maintainability while keeping its behaviour.

DevelopmentGitHub stars: 1kInstalls: 8.4k

Sentry Commit

SentryOfficial

Creates Sentry-style conventional commits with issue references.

DevelopmentGitHub stars: 1kInstalls: 4.6k

Django Perf Review

SentryOfficial

Reviews Django code for performance problems such as N+1 queries and slow querysets.

DevelopmentGitHub stars: 1kInstalls: 2.7k

Find Bugs

SentryOfficial

Finds bugs, security vulnerabilities and code quality issues in the changes on the current branch.

DevelopmentGitHub stars: 1kInstalls: 6.5k

GHA Security Review

SentryOfficial

Reviews GitHub Actions workflows for vulnerabilities that could be exploited.

DevelopmentGitHub stars: 1kInstalls: 4.5k

Iterate PR

SentryOfficialAudit warning

Iterates on a pull request until CI passes and high and medium review feedback has been addressed.

DevelopmentGitHub stars: 1kInstalls: 4.4k

PR Writer

SentryOfficial

Writes or refreshes pull request titles and descriptions for reviewers.

DevelopmentGitHub stars: 1kInstalls: 4.4k

Presentation Creator

SentryOfficial

Creates data-driven presentation slides with React, Vite and Recharts in Sentry branding.

DocumentsGitHub stars: 1kInstalls: 2.7k

Prompt Optimizer

SentryOfficial

Creates, optimises and refines agent prompts, system prompts and reusable prompt templates.

WritingGitHub stars: 1kInstalls: 2k

Security Review

SentryOfficial

Reviews code for security vulnerabilities such as injection, XSS and authentication or authorisation flaws.

DevelopmentGitHub stars: 1kInstalls: 17.6k

Skill Scanner

SentryOfficialAudit warning

Scans agent skills for security problems such as prompt injection before you install them.

DevelopmentGitHub stars: 1kInstalls: 3.5k

Skill Writer

SentryOfficial

Creates and improves agent skills according to the Agent Skills specification.

DevelopmentGitHub stars: 1kInstalls: 2.3k

New Terraform Provider

HashiCorpOfficial

Scaffolds a new Terraform provider with the Plugin Framework: workspace layout, Go module, provider server and schema.

DevelopmentGitHub stars: 880Installs: 3.7k

Terraform Refactor Module

HashiCorpOfficial

Turns monolithic Terraform configurations into reusable modules that follow HashiCorp's module design principles.

DevelopmentGitHub stars: 880Installs: 6k

Terraform Search Import

HashiCorpOfficial

Discovers existing cloud resources with Terraform Search queries and imports them into Terraform management in bulk.

DevelopmentGitHub stars: 880Installs: 4.6k

Terraform Stacks

HashiCorpOfficial

Guides work with Terraform Stacks: creating, modifying and validating stack component and deployment configurations.

DevelopmentGitHub stars: 880Installs: 5.4k

Terraform Style Guide

HashiCorpOfficial

Generates Terraform HCL that follows HashiCorp's official style conventions.

DevelopmentGitHub stars: 880Installs: 11.7k

Terraform Test

HashiCorpOfficial

Guides writing and running Terraform tests: test files, run blocks, assertions and mocked providers.

DevelopmentGitHub stars: 880Installs: 8.2k

MySQL

PlanetScaleOfficialAudit warning

Plans and reviews MySQL and InnoDB schemas, indexing, query tuning, transactions and operations.

DataGitHub stars: 693Installs: 8.1k

Neki

PlanetScaleOfficial

Explains Neki, PlanetScale's sharded Postgres product, for Postgres scaling and sharding work.

DataGitHub stars: 693Installs: 1.5k

Postgres

PlanetScaleOfficialAudit warning

Covers PostgreSQL best practices: query optimisation, connection troubleshooting and performance.

DataGitHub stars: 693Installs: 7.9k

Vitess

PlanetScaleOfficial

Covers Vitess best practices: query optimisation, sharding, VSchema configuration and keyspace management.

DataGitHub stars: 693Installs: 1.5k

Questions

Codex and skills.

Do Claude skills work in Codex?

Often. A skill is a folder of instructions and scripts in the open SKILL.md format, which Codex reads. A skill that depends on tools only one agent provides will not carry over, so read the skill's source before you rely on it.

How do I install a skill in Codex?

Each skill page has an install command. Run it in a terminal, then start a new Codex session so the skill is picked up.

What is the difference between a skill and an instructions file such as AGENTS.md?

An instructions file is loaded in every session and describes the project. A skill is loaded only when a task calls for it, so it can be long and specific without costing context on every turn.

Other agents