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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

Advertising Career

Maya-Beth Finotti

Plans paid-advertising careers with interview preparation, skill-gap roadmaps, NDA-safe portfolios and choices between agency, in-house and freelance work.

ProductivityGitHub stars: 0Installs: 3.5k

Advertising Hiring

Maya-Beth Finotti

Builds hiring packets for paid-advertising roles, covering role scope, scorecards, interview loops, work samples and staged 30-60-90 ramps.

ProductivityGitHub stars: 0Installs: 3.5k

Retargeting Funnel

Maya-Beth Finotti

Designs multi-stage retargeting plans for paid advertising using conversion data, audience exclusions, message ladders, frequency caps and measurement tests.

Marketing and SEOGitHub stars: 0Installs: 3.5k

Browser Use Cloud

Browser UseOfficial

Documents Browser Use Cloud APIs and SDKs for hosted browser automation, sessions, profiles, CDP connections, proxies and integrations.

DevelopmentGitHub stars: 117kInstalls: 3k

Creates an end-to-end map of a customer experience, covering stages, touchpoints, emotions, pain points and improvement opportunities.

ResearchGitHub stars: 26.7kInstalls: 2.9k

Dart Use Doc Examples

FlutterOfficial

Injects external Dart files into dartdoc documentation, with regions and hidden setup lines for focused, analyzable code examples.

DevelopmentGitHub stars: 3kInstalls: 3k

.NET AOT Compat

.NETOfficial

Makes .NET projects compatible with Native AOT and trimming by resolving IL analyzer warnings with annotations, refactoring and source-generated JSON.

DevelopmentGitHub stars: 5.5kInstalls: 2.6k

.NET P/Invoke

.NETOfficial

Creates and reviews .NET P/Invoke and LibraryImport declarations for native libraries, including types, strings, memory ownership and handles.

DevelopmentGitHub stars: 5.5kInstalls: 2.5k

Create Skill

.NETOfficial

Scaffolds new agent skills for the dotnet/skills repository, including frontmatter, directory structure, workflow guidance and validation.

DevelopmentGitHub stars: 5.5kInstalls: 2.5k

Dart Use Path Package

FlutterOfficial

Replaces fragile Dart path string operations with cross-platform handling from package:path and package:file.

DevelopmentGitHub stars: 3kInstalls: 2.6k

Migrates existing C# projects to nullable reference types, resolving compiler warnings while preserving runtime behaviour and API intent.

DevelopmentGitHub stars: 5.5kInstalls: 2.5k

Imports projects and their Git history into an Nx workspace, adapting paths, dependencies, plugins and TypeScript settings for monorepo use.

DevelopmentGitHub stars: 28Installs: 2.4k

Provides language-specific testing guidance for the .NET code-testing pipeline, including commands, conventions and common errors.

DevelopmentGitHub stars: 5.5kInstalls: 2.5k

Detects MSBuild projects whose output or intermediate paths collide across projects, target frameworks, solutions or build configurations.

DevelopmentGitHub stars: 5.5kInstalls: 2.5k

Creates VS Code custom agent files with personas, tool permissions, instructions and handoffs for specialised development workflows.

DevelopmentGitHub stars: 5.5kInstalls: 2.4k

Template Authoring

.NETOfficial

Guides creation, validation and packaging of reusable .NET dotnet new templates from existing projects, preserving project settings, parameters and post-actions.

DevelopmentGitHub stars: 5.5kInstalls: 2.3k

Migrates MSTest v3 test projects to v4, updating packages, source APIs, target frameworks and runner or discovery settings.

DevelopmentGitHub stars: 5.5kInstalls: 2.3k

Test Tagging

.NETOfficial

Classifies existing tests in .NET and other frameworks, applies standard traits, and reports the suite's positive, negative and integration mix.

DevelopmentGitHub stars: 5.5kInstalls: 2.3k

Greploop

GreptileAudit warning

Iteratively improves GitHub pull requests, GitLab merge requests and Perforce changelists by applying Greptile feedback until review goals are met.

DevelopmentGitHub stars: 406Installs: 2.3k

Audits and implements SEO for Next.js App Router sites, covering metadata, sitemaps, structured data, indexing and AI crawler policy.

Marketing and SEOGitHub stars: 67Installs: 2.2k

Grade Tests

.NETOfficial

Grades curated test methods across .NET and other language frameworks, scoring assertions, structure and anti-patterns for concise PR-ready review tables.

DevelopmentGitHub stars: 5.5kInstalls: 2.1k

Facilitates evidence-aware research ideation in Scientific Agent Skills through independent generation, literature checks and traceable prioritisation.

ResearchGitHub stars: 47.4kInstalls: 2k

Guides Blazor developers through prerendering fixes for duplicate loads, state persistence, interactive routing and browser-only dependencies.

DevelopmentGitHub stars: 5.5kInstalls: 2k

Spartan

spartan.ng

Guides Angular projects in setting up and composing spartan/ui components with Brain primitives, copied Helm styling, CLI generators and accessibility patterns.

DevelopmentGitHub stars: 2.9kInstalls: 2k

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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