1,418 free skills
API Design skills
Skills for designing APIs — REST conventions, GraphQL schema design, versioning strategy, rate limiting, and OpenAPI contracts.
Sourced from real, public repositories — synced daily, never invented.
1,418 free skills
Skills for designing APIs — REST conventions, GraphQL schema design, versioning strategy, rate limiting, and OpenAPI contracts.
Sourced from real, public repositories — synced daily, never invented.
15 tools across six categories
13 of them never send your data anywhere
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encrytion-decryption-toolkit
agentpmt/agent-skills
Encryption Decryption Toolkit: Cryptographic toolkit: generate secure randoms, compute. Use when an agent needs encryption decryption toolkit, encrytion decryption toolkit, generating secure api keys or access tokens for authentication systems, creating unique uuids for database record identifiers, computing file checksums to verify data integrity during transfers, validating webhook payloads by computing and comparing hmac signatures, decrypt, value through AgentPMT-hosted remote tool calls.
stripe
kumaran-is/claude-code-onboarding
Use when integrating Stripe payments — subscription billing, customer management, payment links, webhooks, Stripe Connect vendor payouts, or invoicing. Load before writing any Stripe API code. Query the Stripe MCP server for API verification.
stripe-integration
cleodin/antigravity-awesome-skills
Get paid from day one. Payments, subscriptions, billing portal, webhooks, metered billing, Stripe Connect. The complete guide to implementing Stripe correctly, including all the edge cases that will bite you at 3am. This isn't just API calls - it's the full payment system: handling failures, managing subscriptions, dealing with dunning, and keeping revenue flowing. Use when: stripe, payments, subscription, billing, checkout.
stripe-integration
convxai/claude-plugin-agents
Implement Stripe payment processing for robust, PCI-compliant payment flows including checkout, subscriptions, and webhooks. Use when integrating Stripe payments, building subscription systems, or implementing secure checkout flows.
stripe-integration
48nauts-operator/opencode-baseline
Implement Stripe payment processing for robust, PCI-compliant payment flows including checkout, subscriptions, and webhooks. Use when integrating Stripe payments, building subscription systems, or implementing secure checkout flows.
stripe-webhook-first-billing-state
andrewsrigom/agent-skills
Use when implementing Stripe webhooks, billing-state synchronization, or post-payment fulfillment. Covers signature verification, idempotent event handling, durable projections of Stripe state, and the rule that redirects and client events are not the source of truth.
coldbox-rest-api-development
coldbox/skills
Use this skill when building RESTful APIs in ColdBox using RestHandler, creating CRUD API endpoints, implementing API versioning, handling JWT/bearer token authentication, building structured error responses, or creating resource representations with mementos.
JSON
clawic/skills
Parses, validates, transforms, and designs JSON payloads that survive real parsers, real clients, and real data sizes. Use when a parse fails at a byte offset or on a trailing comma, an id or an amount loses precision, accents and emoji come back as mojibake, a field is null when it should be absent, duplicate keys silently win, a JSON Schema passes what it should reject or a `$ref` will not resolve, a multi-gigabyte file will not fit in memory, a jq, JMESPath, or JSONPath expression returns nothing, two documents must be diffed or patched, a webhook signature fails after the body was re-serialized, untrusted input must be parsed safely, or a response shape has to change without breaking existing clients. Covers NDJSON, JSON Patch, canonical form, JSON columns in SQL, and JSON5/JSONC config files. Not for constraining LLM output (`structured-output`), for YAML, TOML, XML, or CSV (their own skills), or for designing REST endpoints (`rest-api`).
api-designer
wellux/claude-code-deprecated
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api-design-review
andonimichael/arxitect
Reviews code for API design quality including naming conventions, self-documenting interfaces, method signatures, parameter design, type safety, and REST endpoint design. Use when evaluating the usability and readability of public interfaces, class APIs, or REST endpoints.
rest-api-best-practices
luckys/agent-skills
REST API design guidance. Use when designing or reviewing REST endpoints, choosing HTTP methods and status codes, defining URL structure and naming conventions, formatting error responses, implementing pagination or filtering, versioning an API, securing endpoints with authentication or rate limiting, or reviewing whether an API exposes domain capabilities rather than raw CRUD operations.
api-design
cohen-liel/hivemind
REST API design principles and best practices. Use when designing API endpoints, request/response schemas, versioning, error formats, or reviewing API design.
graphql
claudiodearaujo/izacenter
GraphQL gives clients exactly the data they need - no more, no less. One endpoint, typed schema, introspection. But the flexibility that makes it powerful also makes it dangerous. Without proper controls, clients can craft queries that bring down your server. This skill covers schema design, resolvers, DataLoader for N+1 prevention, federation for microservices, and client integration with Apollo/urql. Key insight: GraphQL is a contract. The schema is the API documentation. Design it carefully.
openapi-spec-generation
omixec/mobile-dev-skills
Generate and maintain OpenAPI 3.1 specifications from code, design-first specs, and validation patterns. Use when creating API documentation, generating SDKs, or ensuring API contract compliance.
graphql-api
heldinhow/awesome-opencode-dev-skills
Design and implement GraphQL APIs with proper schema design, resolvers, and best practices.
graphql-architect
kmshihab7878/claude-code-setup
Master modern GraphQL with federation, performance optimization, and enterprise security. Build scalable schemas, implement advanced caching, and design real-time systems.
graphql-api
cohen-liel/hivemind
GraphQL API design and implementation patterns. Use when building GraphQL servers, defining schemas, writing resolvers, implementing subscriptions, or consuming GraphQL APIs.
upgrade-stripe
robinebers/skills
Guide for upgrading Stripe API versions and SDKs
upgrade-stripe
agenciatektus/tektus-agent-os
Guide for upgrading Stripe API versions and SDKs
version
open-canal/skills
Use when the user wants to create a version plan, release iteration, semver milestone, or add/remove existing PRD requirements in a version.
openapi-workflow
muyen/vibe-to-prod
Proactive OpenAPI workflow. Triggers when OpenAPI spec files are modified to validate, regenerate code, and verify builds.
openapi
mgd34msu/goodvibes-gemini
Defines and generates OpenAPI 3.1 specifications with TypeScript type generation, validation, and documentation. Use when documenting APIs, generating client SDKs, or implementing contract-first API design.
openapi-swagger
heldinhow/awesome-opencode-dev-skills
Use when documenting REST APIs with OpenAPI 3.x spec, generating Swagger UI, creating typed API clients, or setting up API docs in Node.js/Hono/Fastify/Express projects.
implement-api-rate-limiting
alizharb/agent-skills
Use when adding API rate limits, abuse controls, throttles, and tests for Laravel routes or integrations.
rate-limiting
heldinhow/awesome-opencode-dev-skills
Implement API rate limiting to control request frequency and prevent abuse.
Webhook Design
dasien/retrowarden
Design secure webhooks with HMAC validation, idempotency patterns, and event-driven architecture
integration
alizafarbati/opencode-agents-mcp
Expert integration specialist connecting APIs, services, webhooks, and third-party systems.
grpc-microservices
heldinhow/awesome-opencode-dev-skills
Implement gRPC communication between microservices using protocol buffers.
graphql-api
yiweiwan/skills
Use only when designing, implementing, or modifying GraphQL schemas, queries, mutations, resolvers, dataloaders, authorization, pagination, schema evolution, and GraphQL error behavior.
openapi
agoodway/goodskills
Manage OpenAPI specifications in Phoenix apps using open_api_spex. Dispatches subcommands via `/openapi [subcommand]`. Use when the user says '/openapi regenerate', '/openapi help', 'regenerate openapi', 'update openapi spec', 'openapi json', 'openapi yaml', or wants to regenerate the OpenAPI specification from controller operations.
add-api-version
oxidecomputer/omicron
Add a new version to a Dropshot HTTP API. Use when the user wants to make versioned changes to a Dropshot-managed HTTP API, such as adding, making changes to, or removing an API endpoint.
openapi
agoodway/skills
Manage OpenAPI specifications in Phoenix apps using open_api_spex. Dispatches subcommands via `/openapi [subcommand]`. Use when the user says '/openapi regenerate', '/openapi help', 'regenerate openapi', 'update openapi spec', 'openapi json', 'openapi yaml', or wants to regenerate the OpenAPI specification from controller operations.
openapi
finom/vovk
Vovk.ts OpenAPI generation — how the OpenAPI 3.x spec is derived from procedures + validation schemas, the `@operation` decorator family (`@operation({...})` for summary/description/tags/security/deprecated, `@operation.error(status, message)` for error responses, `@operation.tool({...})` for AI tool metadata), top-level `outputConfig.openAPIObject` configuration (info, servers, license, tags, security, components), per-segment overrides, accessing the spec from code (`vovk-client/openapi`), serving the spec JSON from a controller, and rendering it with **Scalar** (the primary / recommended docs UI — picks up the TypeScript / Python / Rust code samples that Vovk generates via `x-codeSamples`) or alternatives like Redoc / Swagger UI. Use whenever the user asks for "API docs", "Scalar docs", "Swagger", "OpenAPI spec", "document my API", "generate OpenAPI from my controllers", "add an info/title/servers block", "segment-specific docs", "expose OpenAPI at /api/docs", "bearer auth in the spec", "document possible errors", "deprecate an endpoint". Does NOT cover procedure authoring → hand off to `procedure` skill. Does NOT cover AI tool derivation via `deriveTools` → hand off to `tools` skill (though `@operation.tool` is mentioned here since it's part of the decorator family). Does NOT cover third-party OpenAPI imports → hand off to `mixins` skill.
grpc-patterns
marvinrichter/clarc
gRPC + Protocol Buffers patterns — proto schema design, code generation, unary and streaming call types, error handling with gRPC status codes, interceptors, reflection, and client usage. For service-to-service communication where REST is insufficient.
api-architecture
alizafarbati/opencode-agents-mcp
Expert API architect specializing in API gateway design, API management, API security, developer portals, and API monetization strategies.
yourwebs
sugarforever/yourwebs-skill
Use when the user wants to publish, host, or share a self-contained HTML page or artifact on yourweb (yourwebs.cc) — getting a public URL — or to list, fetch, update, or delete their hosted pages via the yourweb REST API.
resend-inbound
resend/resend-skills
Use when receiving emails with Resend - setting up inbound domains, processing email.received webhooks, retrieving email content/attachments, or forwarding received emails.
chat-sdk
openai/plugins
Vercel Chat SDK expert guidance. Use when building multi-platform chat bots — Slack, Telegram, Microsoft Teams, Discord, Google Chat, GitHub, Linear — with a single codebase. Covers the Chat class, adapters, threads, messages, cards, modals, streaming, state management, and webhook setup.
cms
openai/plugins
Headless CMS integration guidance — Sanity (native Vercel Marketplace), Contentful, DatoCMS, Storyblok, and Builder.io. Covers studio setup, content modeling, preview mode, revalidation webhooks, and Visual Editing. Use when building content-driven sites with a headless CMS on Vercel.
vercel-api
openai/plugins
Vercel app and REST API expert guidance. Use when the agent needs live access to Vercel projects, deployments, environment variables, domains, logs, or documentation through the connected Vercel app or REST API.
vercel-firewall
openai/plugins
Vercel Firewall and security expert guidance. Use when configuring DDoS protection, WAF rules, rate limiting, bot filtering, IP allow/block lists, OWASP rulesets, Attack Challenge Mode, or any security configuration on the Vercel platform.
payments
openai/plugins
Stripe payments integration guidance — native Vercel Marketplace setup, checkout sessions, webhook handling, subscription billing, and the Stripe SDK. Use when implementing payments, subscriptions, or processing transactions.
managing-subscriptions
posthog/posthog
Manage PostHog subscriptions — scheduled email, Slack, or webhook deliveries of insight or dashboard snapshots, optionally with an AI-written summary attached to each delivery. Use when the user wants to subscribe to an insight or dashboard, get an AI summary attached to those deliveries, check existing subscriptions, change delivery frequency, add or remove recipients, or stop receiving updates.
GraphQL Patterns
tuyenht/antigravity-core
Các mẫu thiết kế GraphQL API toàn diện, cấu trúc schema và best practices.
frappe-api
majiayu000/claude-skill-registry
Frappe Python and JavaScript API reference including document operations, database queries, utilities, and REST API patterns. Use when working with frappe.get_doc, frappe.db, frappe.call, or any Frappe API methods.
erpnext-api-patterns
majiayu000/claude-skill-registry
Complete guide for ERPNext/Frappe API integrations (v14/v15/v16) including REST API, RPC API, authentication, webhooks, and rate limiting. Use when code is needed for external API calls to ERPNext, designing API endpoints, configuring webhooks, implementing authentication (token/OAuth2/session). Triggers: API integration, REST endpoint, webhook, token authentication, OAuth, frappe.call, external connection, API response, rate limiting.
golang-gin-architect
cylixlee/cortex
Software architect skill for Go Gin APIs. Covers system design, complexity assessment, scalability patterns, API design, cross-cutting concerns, ADRs, tech debt management, and gingo skill orchestration. Use when making architecture decisions, evaluating complexity, designing systems, choosing patterns, planning API evolution, or coordinating across multiple gin skills. Also activate when the user mentions microservices vs monolith, CQRS, event sourcing, domain modeling, bounded contexts, API versioning, caching strategy, observability, or tech debt. This is the 'brain' that orchestrates all other gin skills.
golang-pro
akindu23/my-agent-skills
Guides high-performance and concurrent Go patterns including goroutines, channels, generics, gRPC, and microservice-oriented structure. Use when building Go services that are concurrent, network-heavy, or performance-sensitive, or when the user names goroutines, channels, gRPC, or Go generics.
n8n-expression-syntax
aim9sour/n8n-skills
Validate n8n expression syntax and fix common errors. Use when writing n8n expressions, using {{}} syntax, accessing $json/$node variables, troubleshooting expression errors, mapping data between nodes, or referencing webhook data in workflows. Use this skill whenever configuring node fields that reference data from previous nodes — expressions are how n8n passes data between nodes, and getting the syntax wrong is the most common source of workflow errors. Also use when asked whether a complex expression hurts performance.
n8n-expression-syntax
agenciatektus/tektus-agent-os
Validate n8n expression syntax and fix common errors. Use when writing n8n expressions, using {{}} syntax, accessing $json/$node variables, troubleshooting expression errors, mapping data between nodes, or referencing webhook data in workflows. Use this skill whenever configuring node fields that reference data from previous nodes — expressions are how n8n passes data between nodes, and getting the syntax wrong is the most common source of workflow errors.
django-expert
wesleyegberto/software-engineering-skills
Use when building Django web applications or REST APIs with Django REST Framework. Invoke when working with settings.py, models.py, manage.py, or any Django project file. Creates Django models with proper indexes, optimizes ORM queries using select_related/prefetch_related, builds DRF serializers and viewsets, and configures JWT authentication. Trigger terms: Django, DRF, Django REST Framework, Django ORM, Django model, serializer, viewset, Python web.
django-expert
nkseth/copilot-dev-skills
Use when building Django web applications or REST APIs with Django REST Framework. Invoke when working with settings.py, models.py, manage.py, or any Django project file. Creates Django models with proper indexes, optimizes ORM queries using select_related/prefetch_related, builds DRF serializers and viewsets, and configures JWT authentication. Trigger terms: Django, DRF, Django REST Framework, Django ORM, Django model, serializer, viewset, Python web.
flask-smorest-api
jmazzahacks/byteforge-claude-skills
Set up Flask REST API with flask-smorest, OpenAPI docs, blueprint architecture, and dataclass models. Use when creating a new Flask API server, building REST endpoints, or setting up a production API.
openapi
kittne/codex-skills-by-codex
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portainer-ce-2-39
cbnsndwch/skills
Interact with the Portainer CE v2.39.0 REST API. Covers authentication, environments, stacks, containers, Docker proxy, Kubernetes resources, edge agents, registries, users/teams, and settings. Use when automating Portainer 2.39.x deployments or writing integration code against this version.
supabase
domush/ai-agent-web-development-skills
Use when doing ANY task involving Supabase. Triggers: Supabase products (Database, Auth, Edge Functions, Realtime, Storage, Vectors, Cron, Queues); client libraries and SSR integrations (supabase-js, @supabase/ssr) in Next.js, React, SvelteKit, Astro, Remix; auth issues (login, logout, sessions, JWT, cookies, getSession, getUser, getClaims, RLS); Supabase CLI or MCP server; schema changes, migrations, security audits, Postgres extensions (pg_graphql, pg_cron, pg_vector).
supabase
agenciatektus/tektus-agent-os
Use when doing ANY task involving Supabase. Triggers: Supabase products (Database, Auth, Edge Functions, Realtime, Storage, Vectors, Cron, Queues); client libraries and SSR integrations (supabase-js, @supabase/ssr) in Next.js, React, SvelteKit, Astro, Remix; auth issues (login, logout, sessions, JWT, cookies, getSession, getUser, getClaims, RLS); Supabase CLI or MCP server; schema changes, migrations, security audits, Postgres extensions (pg_graphql, pg_cron, pg_vector).
supabase
supabase-community/codex-plugin
Use when doing ANY task involving Supabase. Triggers: Supabase products (Database, Auth, Edge Functions, Realtime, Storage, Vectors, Cron, Queues); client libraries and SSR integrations (supabase-js, @supabase/ssr) in Next.js, React, SvelteKit, Astro, Remix; auth issues (login, logout, sessions, JWT, cookies, getSession, getUser, getClaims, RLS); Supabase CLI or MCP server; schema changes, migrations, security audits, Postgres extensions (pg_graphql, pg_cron, pg_vector).
supabase
sebfranklin/franklin-skills
Use when doing ANY task involving Supabase. Triggers: Supabase products (Database, Auth, Edge Functions, Realtime, Storage, Vectors, Cron, Queues); client libraries and SSR integrations (supabase-js, @supabase/ssr) in Next.js, React, SvelteKit, Astro, Remix; auth issues (login, logout, sessions, JWT, cookies, getSession, getUser, getClaims, RLS); Supabase CLI or MCP server; schema changes, migrations, security audits, Postgres extensions (pg_graphql, pg_cron, pg_vector).
supabase
sarthib7/agentsmith
Use when doing ANY task involving Supabase. Triggers: Supabase products (Database, Auth, Edge Functions, Realtime, Storage, Vectors, Cron, Queues); client libraries and SSR integrations (supabase-js, @supabase/ssr) in Next.js, React, SvelteKit, Astro, Remix; auth issues (login, logout, sessions, JWT, cookies, getSession, getUser, getClaims, RLS); Supabase CLI or MCP server; schema changes, migrations, security audits, Postgres extensions (pg_graphql, pg_cron, pg_vector).