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Top Skills for Codex CLI

OpenAI's coding agent CLI. Adopted the SKILL.md spec verbatim in Dec 2025.

53 verified skills · vendor: OpenAI · native SKILL.md supportInstall docs

About Codex CLI

Codex CLI is OpenAI's coding agent CLI — terminal-first like Claude Code — and it adopted the SKILL.md spec verbatim in December 2025. Skills on Codex CLI load the same way Anthropic Skills do, with the same frontmatter schema, but run against an OpenAI model (GPT-5 family) instead of Claude.

The install model mirrors Claude Code: Skills live as folders under `~/.codex/skills/` (user-wide) or `.codex/skills/` (project-scoped). Many Claude-targeted Skills run cleanly on Codex with no changes; some need minor adjustments where they assume Claude-specific tool names or system-prompt conventions. The CLI also supports Workflows for multi-agent orchestration similar to Claude Code's.

Codex CLI is the right Skill target for teams already standardized on OpenAI infrastructure who want SKILL.md-driven workflows. Composite scoring weights cross-agent verification — Skills tested in both Codex and Claude Code rank above single-target Skills.

Verified for this agent

Best Skills for Codex

Every skill below is verified to work with Codex CLI. Ranked by composite score.

Escape generic AI-generated UIs. Forces a bold, distinctive design direction before any code is written.

ReactTailwindDesign
All surfaces

Resend's deliverability playbook: SPF/DKIM/DMARC, spam avoidance, bounce handling, and CAN-SPAM/GDPR/CASL compliance.

EmailDeliverabilitySPF/DKIM/DMARC
Code

Build cross-client HTML emails as React components, with a visual editor and Resend-ready rendering.

React EmailTemplatesTransactional
Code

Resend's own API skill: send transactional and batch email, handle inbound webhooks, and manage domains, templates, and keys.

ResendEmailTransactional
Code

Give an agent a webhook-driven inbox with the sender-allowlist and content-filtering patterns that block prompt injection from inbound email.

Inbound EmailAgent SecurityWebhooks
Code

Structured multi-step development. Brainstorm → spec → plan → build → review → merge — TDD baked in.

TDDMulti-agentPlans
Code

Paddle's own integration playbook: ten skills for Checkout, webhooks, pricing pages, and subscription lifecycle on the merchant-of-record platform.

PaddleSubscriptionsMerchant of Record
Code

Open-source marketing stack for AI coding agents. SEO, content, email, ads, analytics in one bundle.

SEOContentGrowth
Code

Twilio's official Developer Kit: 55 skills across SMS, WhatsApp, Voice, Verify, SendGrid, and compliance — plus the Twilio MCP. Public beta.

TwilioSMSWhatsAppVoice
Code

Full-stack WorkOS implementation with auth provider migration paths.

WorkOSAuthSSO
Code

1,000+ SaaS integrations as one skill. OAuth lifecycle, scoped credentials, structured actions.

OAuthSaaSAction-taking
All surfaces

ADR authoring + design review. Trade-offs, consequences, alternatives.

ADRArchitectureDesign
All surfaces

Disciplined debugging loop. Reproduce, isolate, diagnose, fix.

DebugDiagnosisTroubleshooting
All surfaces

Technical writing that engineers will actually read and update.

DocumentationWritingREADME
All surfaces

Incident triage + comms + blameless postmortem in one harness.

IncidentPostmortemOn-call
All surfaces

System design from requirements. APIs, data, boundaries, scale.

System DesignArchitectureAPI
All surfaces

Honest tech-debt audit with a prioritized cleanup backlog.

Tech DebtRefactorAudit
All surfaces

Layered test plan sized to the change's risk profile.

TestingStrategyCoverage
All surfaces

Self-contained HTML artifacts with React + shadcn/ui — no build step, just paste and run.

Reactshadcn/uiArtifacts
All surfaces
Official

Extract, fill, merge. PDF manipulation with bundled scripts so Claude does not waste tokens generating them.

PDFFormsRead-write
All surfaces

Supabase done right. RLS policies, edge functions, realtime, auth — in idiomatic patterns.

PostgresRLSRealtime
Code

Stripe done right. Checkout, subscriptions, webhooks, idempotency, metered billing.

StripePaymentsWebhooks
All surfaces

Shopify Storefront API: cart, checkout, metafields, customer accounts, Hydrogen patterns.

ShopifyCommerceHydrogen
Code

Sentry the right way. Source maps, releases, breadcrumbs, performance, structured tags.

SentryErrorsObservability
Code

Security audits run by a real security firm. CodeQL + Semgrep + audit workflows.

CodeQLSemgrepAudit
Code

Web scraping, search, and browser automation built to be agent-friendly.

ScrapingSearchWeb
All surfaces

Web search + 36 authoritative data sources. SEC, PubMed, ChEMBL, FRED — agent-grade research.

SearchSECPubMed
All surfaces

Next.js App Router by the book. Server components, streaming, parallel routes.

Next.jsReactApp Router
Code

20 SEO + GEO skills in one bundle. Keyword research, audits, rank tracking, AI search optimization.

SEOGEOContent
Code
Community

TDD with red/green/refactor as a concrete TypeScript walkthrough.

TDDTypeScript
Code

32+ marketing skills in one bundle. CRO, copywriting, SEO, analytics, email, growth.

CROCopywritingEmail
Code

Strip the AI tells. Multi-pass editing for content that reads opinionated, not generated.

EditingVoiceAEO
Code

Prisma migrations and queries by the book. Index-aware, migration-safe, type-correct.

PrismaTypeScriptMigrations
Code

Caching without the bugs. Invalidation, write-through, cache-aside, distributed locks.

RedisCachePerformance
Code

CRO patterns from real teardowns. Hero copy, social proof, friction audits, test design.

CROA/B testingFunnel
Code

Full email sequences with branching, exit conditions, and copy that does not read like an AI wrote it.

EmailLifecycleDrip
Code

Dockerfiles done right. Multi-stage, cache-friendly, distroless, hardened.

DockerContainersSecurity
Code

GitHub Actions workflows with matrix, reusable jobs, OIDC, secrets done right.

GitHub ActionsCI/CDYAML
Code

TypeScript strict mode by default. Discriminated unions, branded types, exhaustive switches.

TypeScriptTypesStrict
Code

Vitest patterns: snapshots, mocks, parallel runs, in-source tests, coverage.

VitestUnit testingTypeScript
Code

FAQ

Frequently asked

How do I install a Skill on Codex CLI?

Drop the Skill folder under `~/.codex/skills/` for user-wide or `.codex/skills/` for project-scoped. Codex loads SKILL.md the same way Claude Code does.

Do Claude Skills work on Codex CLI?

Most do — the SKILL.md spec is the same. Skills that hardcode Claude-specific tool names or assume Claude system-prompt conventions may need minor adjustments.

Which model does Codex CLI use?

GPT-5 family by default. Skill performance varies between model tiers; the best Codex-targeted Skills are tuned for the specific model.

Does Codex CLI support Workflows?

Yes — Codex has a Workflow primitive for multi-agent orchestration similar to Claude Code's. Skills can be invoked from within Workflows.

Is Codex CLI free?

The CLI itself is free; usage is billed against your OpenAI API account.

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