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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graphql-architect
itsimonfredlingjack/codex-dev-plugin
Master modern GraphQL with federation, performance optimization, and enterprise security. Build scalable schemas, implement advanced caching, and design real-time systems. Use PROACTIVELY for GraphQL architecture or performance optimization.
hunt-grpc
uphiago/recon-skills
Hunt gRPC vulnerabilities — server reflection enabled (enumerate all services/methods), missing authentication / metadata-stripping on internal endpoints, plaintext gRPC over HTTP/2, internal endpoint disclosure, proto file leakage, gRPC-Web/grpc-gateway transcoding injection, and HTTP/2 Rapid Reset DoS (CVE-2023-44487). Use when target exposes port 50051 / 443 / 8443 / 9090 with HTTP/2, when grpcurl/grpcui detects reflection, when an Envoy or grpc-gateway proxy is fronting a microservice, or when recon reveals a microservice architecture.
defillama-pro-openapi-skill
holon-run/uxc
Operate DefiLlama Pro analytics APIs through UXC with a curated OpenAPI schema, path-templated API-key auth, and read-first guardrails.
defillama-yields-openapi-skill
holon-run/uxc
Operate DefiLlama public yield APIs through UXC with a curated OpenAPI schema and read-first guardrails.
helius-openapi-skill
holon-run/uxc
Operate Helius Wallet API reads through UXC with a curated OpenAPI schema, API-key auth, and read-first guardrails.
dexscreener-openapi-skill
holon-run/uxc
Operate DexScreener public market data APIs through UXC with a curated OpenAPI schema, no-auth setup, and read-first guardrails.
mempool-space-openapi-skill
holon-run/uxc
Operate mempool.space public Bitcoin and Lightning explorer APIs through UXC with a curated OpenAPI schema, no-auth setup, and read-first guardrails.
blocknative-openapi-skill
holon-run/uxc
Operate Blocknative gas intelligence APIs through UXC with a curated OpenAPI schema, API-key auth, and read-first guardrails.
coinapi-openapi-skill
holon-run/uxc
Operate CoinAPI market data reads through UXC with a curated OpenAPI schema, API-key auth, and read-first guardrails.
blockscout-openapi-skill
holon-run/uxc
Operate Blockscout explorer reads through UXC with a curated OpenAPI schema, instance-specific host selection, and read-first guardrails.
Scrape
bighardperson/computer-science-skills-collection
Legal web scraping with robots.txt compliance, rate limiting, and GDPR/CCPA-aware data handling.
yookassa
gulivan/yookassa-skill
Russian payment gateway integration using YooKassa. Use when creating payments, processing transactions, handling webhooks, managing refunds, or implementing Russian fiscalization via 54-FZ.
api-design
andvl1/claude-plugin
REST API design principles and patterns - use when designing new endpoints, creating DTOs, or planning API structure
graphql-architect
thesaifalitai/claude-setup
Use when designing GraphQL schemas, implementing Apollo Federation, or building real-time subscriptions. Invoke for schema design, resolvers with DataLoader, query optimization, federation directives.
api-versioning
kentoshimizu/sw-agent-skills
API version lifecycle governance for breaking-change classification, deprecation windows, migration planning, and support matrix management across internal and external consumers. Trigger when contract diffs may break consumers (for example required-field removal, semantic change, or channel change), when deprecation/sunset planning is required, or when multiple consumer cohorts must be supported in parallel. Do not use for first-pass endpoint/schema design.
rate-limiter-flexible
animir/node-rate-limiter-flexible
Use this skill whenever working with rate limiting, brute-force protection, DoS mitigation, or the `rate-limiter-flexible` npm package in Node.js. Triggers include: mentions of 'rate limit', 'rate-limiter-flexible', 'RateLimiter', 'brute force protection', 'login endpoint protection', 'too many requests', '429', throttling in Node.js, or configuring limiters with Redis/Mongo/MySQL/PostgreSQL/Memory/Memcached/DynamoDB/Drizzle/Prisma/SQLite/Cluster/PM2/Etcd/Valkey. Also trigger when writing Express/Koa/Hapi middleware for request limiting, or protecting APIs and websockets from flooding. Use this skill even for tangential questions about rate limiting architecture, choosing a store backend, or scaling rate limiters in distributed systems.
rate-limit-strategist
fatih-developer/fth-skills
Selects the optimal rate limiting strategy (sliding window, token bucket, leaky bucket) for per-user, per-IP, or global levels.
rate-limiting
soden46/syarif-laravel-ai-skills
Laravel guidance to apply per-user and per-route limits with RateLimiter and throttle middleware; use backoffs and headers for clients
openapi-to-mcp
mcp-use/mcp-use
Build and deploy an MCP server from an OpenAPI / Swagger spec using the mcp-use TypeScript SDK. Use this skill whenever the user wants to "turn this OpenAPI spec into an MCP server", "make this API usable from Claude/ChatGPT", "wrap this Swagger doc as MCP tools", "expose this REST API to an LLM", "generate MCP tools from a spec", or pastes/attaches an `openapi.yaml`, `openapi.json`, or `swagger.json` and asks for a Claude-compatible version. Trigger even if the user doesn't say "MCP" — if they describe an existing HTTP API (REST endpoints, an internal service, a third-party API they have a key for) and want an LLM to call it, this is the right skill. Covers spec ingestion (file path, URL, or pasted), operation-to-tool mapping, auth wiring (apiKey, bearer, basic, OAuth bearer), scaffolding with `create-mcp-use-app`, tool generation with proper zod schemas, live testing in the mcp-use inspector, and deploying to Manufact / mcp-use cloud.
omni-content-builder
exploreomni/omni-cursor-plugin
Create, update, and manage Omni Analytics documents and dashboards programmatically — document lifecycle, tiles, visualizations, filters, and layouts — using the REST API. Use this skill whenever someone wants to build a dashboard, create a workbook, add tiles or charts, configure dashboard filters, update an existing dashboard's model, set up a KPI view, create visualizations, lay out a dashboard, create a document, rename a workbook, delete a dashboard, move a document to a folder, duplicate a dashboard, or any variant of "build a dashboard for", "create a report showing", "add a chart to", "make a dashboard", "update the dashboard layout", "rename this document", "move to folder", or "delete this dashboard". Also use when modifying dashboard-level model customizations like workbook-specific joins or fields.
omni-embed
exploreomni/omni-cursor-plugin
Embed Omni Analytics dashboards in external applications — URL signing, custom themes, iframe events, entity workspaces, and permission-aware content — using the @omni-co/embed SDK and REST API. Use this skill whenever someone wants to embed a dashboard, sign an embed URL, customize the embedded theme, handle embed events, listen for clicks or drills in the iframe, send filters to an embedded dashboard, set up entity workspaces, look up embed users, build a permission-aware content list, white-label an embedded dashboard, or any variant of "embed this dashboard", "customize the iframe theme", "handle click events from the embed", "filter the embedded dashboard", "set up embedding", or "what dashboards can this user see".
omni-content-explorer
exploreomni/omni-cursor-plugin
Find, browse, and organize content in Omni Analytics — dashboards, workbooks, folders, and labels — using the REST API. Use this skill whenever someone wants to find an existing dashboard, search for content, list workbooks, browse folders, see what dashboards exist, find popular reports, download a dashboard as PDF or PNG, favorite content, manage labels on documents, or any variant of "find the dashboard about", "what reports do we have", "show me our dashboards", "where is the sales report", or "download this dashboard".
omni-admin
exploreomni/omni-cursor-plugin
Administer an Omni Analytics instance — manage connections, users, groups, user attributes, permissions, schedules, and schema refreshes via the REST API. Use this skill whenever someone wants to manage users or groups, set up permissions on a dashboard or folder, configure user attributes, create or modify schedules, manage database connections, refresh a schema, set up access controls, provision users, or any variant of "add a user", "give access to", "set up permissions", "who has access", "configure connection", "refresh the schema", or "schedule a delivery".
omni-model-explorer
exploreomni/omni-cursor-plugin
Discover and inspect Omni Analytics models, topics, views, fields, dimensions, measures, and relationships using the Omni REST API. Use this skill whenever someone wants to understand what data is available in Omni, explore their semantic model, find specific fields or views, check how tables join together, see what topics exist, or asks any variant of "what can I query", "what fields are available", "show me the model", "what data do we have", or "how is this data modeled". Also use when you need to understand the Omni model structure before building or modifying anything.
omni-model-builder
exploreomni/omni-cursor-plugin
Create and edit Omni Analytics semantic model definitions — views, topics, dimensions, measures, relationships, and query views — using YAML through the Omni REST API. Use this skill whenever someone wants to add a field, create a new dimension or measure, define a topic, set up joins between tables, modify the data model, build a new view, add a calculated field, create a relationship, edit YAML, work on a branch, promote model changes, or any variant of "model this data", "add this metric", "create a view for", or "set up a join between". Also use for migrating modeling patterns since Omni's YAML is conceptually similar to other semantic layer definitions.
cpp
cloudvoyant/codevoyant
C++ project patterns: CMake build system, Conan package management, gRPC services, code standards, and release/sanitizer build profiles. Load when writing CMakeLists.txt, conanfile.py, .proto files, or setting up C++ CI.
deno-api-hono
jcurbelo/skills
Guidelines for building production-ready HTTP APIs with Deno and Hono framework. Use when creating REST APIs, web services, microservices, or any HTTP server using Deno runtime and Hono. Covers authentication, rate limiting, validation, and deployment patterns.
flask-api-development
findinfinitelabs/chuuk
Build Flask REST APIs with authentication, file handling, database integration, and production deployment. Use when creating or modifying API endpoints, implementing authentication, or working with the Flask backend for the Chuuk Dictionary application.
supabase
fradser/dotclaude
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).
redis
codeatcode/oss-ai-skills
Redis - in-memory database, caching, pub/sub, sessions, rate limiting, data structures
chainstream-graphql
chainstream-io/skills
>-
orchardcore-graphql
crestapps/crestapps.agentskills
Skill for configuring and using the GraphQL API in Orchard Core. Covers GraphQL queries, custom types, content type querying, and GraphQL schema customization. Use this skill when requests mention Orchard Core GraphQL, Configure and Use GraphQL API, Enabling GraphQL Features, Basic Content Query, Query with Filtering, Query with Pagination, or closely related Orchard Core implementation, setup, extension, or troubleshooting work. Strong matches include work with OrchardCore.Apis.GraphQL, OrchardCore.ContentManagement, OrchardCore.Apis, MyPart, MyField, MyPartIndexAliasProvider, IIndexAliasProvider, MyPartIndex, IEnumerable, IServiceCollection, WhereInput. It also helps with graphql examples, Query with Filtering, Query with Pagination, Query Specific Content Item, plus the code patterns, admin flows, recipe steps, and referenced examples captured in this skill.
openapi
deerhide/agent_skills
Provide recommendations and best practices for designing OpenAPI specifications.
payment-integration
herdiansah/antigravity-skills-master
Integrate Stripe, PayPal, and payment processors. Handles checkout flows, subscriptions, webhooks, and PCI compliance. Use PROACTIVELY when implementing payments, billing, or subscription features.
stripe
clownnvd/claude-code-skills
Use when adding payments, billing, checkout, subscriptions, invoices, webhooks, customer portal, Stripe Connect, metered/usage billing, tax, fraud/Radar, pricing page, payment intents, refunds, coupons, promo codes, or any Stripe integration in Next.js. Triggers: stripe, payment, checkout, subscribe, billing, invoice, webhook, portal, connect, marketplace, payout, metered, usage-based, SaaS pricing, paywall, plan, tier.
stripe-integration
herdiansah/antigravity-skills-master
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.
rest-api-design
emvnuel/skill.md
REST API design patterns and MicroProfile OpenAPI documentation. Use when designing endpoints, choosing HTTP methods, status codes, or documenting APIs with OpenAPI annotations.
graphql
kilo-org/kilo-marketplace
Expert in GraphQL API development with type-safe patterns and optimization
oRPC OpenAPI Specification
ali-master/skills
Generate OpenAPI specifications for oRPC with ease.
openapi
joaoseidel/ktor-toolkit
>-
api-rate-limiting-throttling
mickeyyaya/refactoring-skills
Use when designing or reviewing rate limiting implementations — covers Token Bucket, Leaky Bucket, Sliding Window Counter, Fixed Window Counter, distributed Redis-based limiting with Lua scripts, response headers, client-side throttling/backoff, and anti-patterns across TypeScript, Go, Python, and Redis Lua
webhook-architect
fatih-developer/fth-skills
Architects the provider side of the webhook infrastructure. Not only sends data but designs event schemas and robust delivery mechanisms.
api-design-review
chrislacey89/skills
Invoked helper skill for higher-risk API contract decisions, usually called from /research or /write-a-prd. Use when the unresolved question is API shape, compatibility, auth, webhook design, or paradigm choice. Not a default top-level workflow step or a substitute for ordinary implementation work.
graphql-grpc-api-patterns
mickeyyaya/refactoring-skills
Use when reviewing or designing GraphQL and gRPC APIs — covers schema design and evolution, N+1/DataLoader batching, subscriptions, Protobuf field numbering, gRPC streaming modes, breaking-change detection, anti-patterns, and code review signals across TypeScript, Go, and Java
godoc
apstndb/skills
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api-design-rest
kentoshimizu/sw-agent-skills
Resource-oriented REST/OpenAPI contract design for URI/method semantics, idempotency, pagination, and HTTP status behavior. Trigger when REST contract diffs are detected in paths, methods, schemas, or status semantics, or when request-response transport choice is still unresolved before implementation. Do not use for GraphQL schema authoring, error-taxonomy-only changes, version lifecycle governance, or consumer-provider contract test implementation.
api-design-principles
kumaran-is/claude-code-onboarding
Use before designing any REST API endpoint — covers URL structure, HTTP method semantics, pagination, caching, idempotency, and bulk operations across Python FastAPI, NestJS 11.x, and Spring Boot WebFlux 3.5.x. Complements openapi-spec-generation (spec format) and stack-specific implementation skills (code patterns).
functions
browserbase/browse-plugin
Guide deployment of serverless browser automation using the official Browserbase Functions CLI. Use when the user wants to deploy automation to run on a schedule, needs a webhook endpoint for browser automation, wants to run automation in the cloud, or asks about Browserbase Functions.
security-threat-model
majiayu000/spellbook
Threat-model product features, APIs, data flows, secrets, permissions, supply-chain changes, auth boundaries, and risky code paths before or during implementation. Use when touching authentication, authorization, payments, secrets, user data, uploads, webhooks, admin tools, innerHTML/eval/exec, dependency upgrades, or cross-tenant access.
hostinger
alanalvestech/hitank
Manage Hostinger domains, DNS, hosting, subscriptions and VPS via REST API
graphql-architect
sidetoolco/org-charts
Design GraphQL schemas, resolvers, and federation. Optimizes queries, solves N+1 problems, and implements subscriptions. Use PROACTIVELY for GraphQL API design or performance issues.
graphql-architect
herdiansah/antigravity-skills-master
Master modern GraphQL with federation, performance optimization, and enterprise security. Build scalable schemas, implement advanced caching, and design real-time systems. Use PROACTIVELY for GraphQL architecture or performance optimization.
kurrent-upgrade
kurrent-io/skills
Use when migrating an app onto the KurrentDB gRPC client from a legacy EventStoreDB client. Covers both the TCP rewrite and gRPC rebrand paths, plus the esdb to kurrentdb connection-string switch. NOT for code already on the KurrentDB client (use kurrent-docs) or server upgrades.
go-grpc-contracts
szybnev/dev-skills
Change or review Go gRPC or Protocol Buffers services, RPC status mapping, streaming, generated stubs, compatibility, deadlines, or protobuf field evolution. Use for .proto files and grpc.Server or grpc.ClientConn code.
go-error-handling
imrenagi/skills
Best practices for error handling in Go applications, including error wrapping, domain errors, sentinel vs typed errors, and gRPC error mapping.
oRPC OpenAPI to Contract
ali-master/skills
Generate an oRPC contract from an existing OpenAPI specification with Hey API.
payment-integration
sidetoolco/org-charts
Integrate Stripe, PayPal, and payment processors. Handles checkout flows, subscriptions, webhooks, and PCI compliance. Use PROACTIVELY when implementing payments, billing, or subscription features.
stripe-integration
hainamchung/agent-assistant
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.
kotlin-spring-boot
andvl1/claude-plugin
Kotlin + Spring Boot 4.0.x patterns — use for backend services, REST APIs, DI, controllers, services. Always use these versions verbatim; do not downgrade to Spring Boot 3.x or Kotlin 2.1.x even if your training data suggests older releases.
api-designer
sundial-org/awesome-openclaw-skills
Use when designing REST or GraphQL APIs, creating OpenAPI specifications, or planning API architecture. Invoke for resource modeling, versioning strategies, pagination patterns, error handling standards.