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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

Webflow Link Checker

WebflowOfficialAudit warning

Finds and fixes broken or insecure links across a Webflow site, including CMS content.

Marketing and SEOGitHub stars: 126Installs: 0

Webflow Site Audit

WebflowOfficial

Audits a Webflow site, covering pages, CMS collections and a health score, with actionable findings.

Marketing and SEOGitHub stars: 126Installs: 0

BFL API

Black Forest LabsOfficial

Integration guide for the BFL FLUX API: endpoints, async polling, rate limits, error handling and webhooks, with Python and TypeScript examples.

Video and mediaGitHub stars: 123Installs: 671

FLUX 3 Prompt Doctor

Black Forest LabsOfficialAudit warning

Checks a FLUX 3 brief before generation and resolves requirements that are missing or in conflict.

Video and mediaGitHub stars: 123Installs: 120

FLUX Image Best Practices

Black Forest LabsOfficial

Prompting guide for FLUX image models: text-to-image, image-to-image, structured JSON prompts, typography and multi-reference editing.

Video and mediaGitHub stars: 123Installs: 237

Creates an on-brand Canva presentation from an outline or brief.

DesignGitHub stars: 113Installs: 296

Translates all the text in a Canva design into another language and saves it as a translated copy.

DesignGitHub stars: 113Installs: 83

Canva Bulk Create

CanvaOfficial

Creates one Canva design per row of tabular data, using a brand template with autofill fields.

DesignGitHub stars: 113Installs: 234

Resizes a Canva design into Facebook, Instagram and LinkedIn post and story formats.

DesignGitHub stars: 113Installs: 270

Neon Auth

NeonOfficial

Adds authentication to an app with Neon Auth: sign-up, sign-in, OAuth, passkeys, magic links and organisations.

DevelopmentGitHub stars: 98Installs: 6.9k

Helps choose and create the right Neon branch type for testing, migrations and isolated development.

DataGitHub stars: 98Installs: 16.8k

Neon Postgres

NeonOfficial

Guides work with Postgres on Neon: connections, pooling, migrations, branching, autoscaling and read replicas.

DataGitHub stars: 98Installs: 208k

Neon

NeonOfficial

Overview of Neon's backend primitives around Postgres: Auth, Object Storage, Functions and the AI Gateway.

DevelopmentGitHub stars: 98Installs: 162k

Clerk Setup

ClerkOfficial

Sets up Clerk authentication in a project with the Clerk CLI and official quickstarts, or migrates an existing auth system to Clerk.

DevelopmentGitHub stars: 84Installs: 50.9k

Clerk

ClerkOfficial

Routes Clerk questions to the right specialised skill, across CLI operations, custom sign-in flows and framework patterns.

DevelopmentGitHub stars: 84Installs: 28.6k

Clerk Organizations

ClerkOfficial

Implements Clerk Organizations for B2B and multi-tenant apps: org switching, roles and permissions, verified domains and enterprise SSO.

DevelopmentGitHub stars: 84Installs: 45.4k

Clerk Webhooks

ClerkOfficial

Handles Clerk webhooks: verify events and sync user, session, organisation and billing data to your database.

DevelopmentGitHub stars: 84Installs: 47.3k

Advanced Clerk patterns for Next.js: middleware, Server Actions and caching.

DevelopmentGitHub stars: 84Installs: 48.5k

Mapbox Cartography

MapboxOfficial

Guides map design with Mapbox: colour, visual hierarchy, typography and cartographic conventions.

DesignGitHub stars: 80Installs: 1.9k

Helps choose the right Mapbox search tool and parameters for geocoding, POI search and location discovery.

DevelopmentGitHub stars: 80Installs: 1.6k

Integration patterns for Mapbox GL JS in React, Vue, Svelte and Angular: setup, lifecycle, tokens and search.

DevelopmentGitHub stars: 80Installs: 2.4k

Builds or updates a PostHog dashboard from a set of insights through MCP.

DataGitHub stars: 72Installs: 48

Guides the creation of a PostHog experiment: hypothesis, rollout, bucketing, analytics and running time.

DataGitHub stars: 72Installs: 351

Creates and launches PostHog surveys through MCP, including NPS and CSAT popovers and hosted feedback forms.

DataGitHub stars: 72Installs: 22

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.

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