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
Free · No signup · No trial clock
SEE THE DIRECTORY
graphql-schema
chriswiles/claude-code-showcase
GraphQL queries, mutations, and code generation patterns. Use when creating GraphQL operations, working with Apollo Client, or generating types.
dotnet-openapi
wshaddix/dotnet-skills
Generating OpenAPI docs. MS.AspNetCore.OpenApi (.NET 9+), Swashbuckle migration, NSwag.
dotnet-api-docs
wshaddix/dotnet-skills
Generating API documentation. DocFX setup, OpenAPI-as-docs, doc-code sync, versioned docs.
dotnet-grpc
wshaddix/dotnet-skills
Building gRPC services. Proto definition, code-gen, ASP.NET Core host, streaming, auth.
api-development-expert
oimiragieo/agent-studio
API development expert including REST design, OpenAPI, and documentation
openapi-generator
membranedev/application-skills
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okx-trading
jasonviipers/okx-trading-skill
Implement and maintain the OKX broker/provider integration for this workspace using okx-api SDK best practices, including auth/signing, spot/margin/futures/options trading, market/account endpoints, rate limiting, websocket subscriptions, and OKX error handling. Use when adding or changing any code under src/providers/okx or when an LLM needs canonical SDK usage patterns derived from .trae/okx-api-llm.txt.
implementing-ddos-mitigation-with-cloudflare
mukul975/anthropic-cybersecurity-skills
Configure Cloudflare DDoS protection with managed rulesets, rate limiting,
payment-integration
samhvw8/dot-claude
Payment gateway integration. Providers: SePay (Vietnamese: VietQR, bank transfer, cards), Polar (global SaaS: subscriptions, usage-based billing). SDKs: Node.js, PHP, Python, Go, Laravel, Next.js. Capabilities: checkout flows, subscription management, webhooks, QR code generation, benefit automation, tax compliance. Actions: integrate, implement, configure, handle payments/subscriptions/webhooks. Keywords: payment gateway, SePay, Polar, VietQR, bank transfer, subscription, usage-based billing, checkout, webhook, QR code, API key, OAuth2, product management, customer portal, tax compliance, MoR, recurring payment, invoice. Use when: integrating payment processing, implementing checkout, managing subscriptions, handling payment webhooks, generating payment QR codes, building billing systems.
sequenzy-email-marketing
sequenzy/skills
Primary agent guide for operating Sequenzy as an email-marketing platform. Use when Codex needs to authenticate, inspect identity, manage subscribers, create or edit campaigns/sequences/templates, control the campaign lifecycle (cancel, pause, resume, delete, duplicate), run campaign A/B tests, mutate lists/tags/segments, enroll subscribers into sequences, invite team members, triage and reply to inbox conversations, manage outbound webhooks, generate draft email content, send transactional email, read delivery stats, or decide whether a requested Sequenzy email-marketing workflow is currently supported. Prefer this over the generic sequenzy skill when both seem relevant.
firebase-data-connect
evanca/flutter-ai-rules
Use when setting up Data Connect, writing GraphQL queries/mutations, configuring generated SDKs, handling offline, or applying security rules.
azure-devops-skill
julianobarbosa/claude-code-skills
Comprehensive Azure DevOps REST API skill for work items, pipelines, repos, test plans, wikis, and search operations via MCP tools and direct API calls
convex-helpers-patterns
op0ai/claude-skills
Guide for convex-helpers library patterns including Triggers, Row-Level Security (RLS), Relationship helpers, Custom Functions, Rate Limiting, and Workpool. Use when implementing automatic side effects, access control, relationship traversal, auth wrappers, or concurrency management. Activates for triggers setup, RLS implementation, custom function wrappers, or convex-helpers integration tasks.
graphql-codegen
claude-dev-suite/claude-dev-suite
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stripe-webhook-idempotency
josiahsiegel/claude-plugin-marketplace
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author-governance-ruleset
mulesoft/mulesoft-dx
Use when the user asks to create, write, generate, modify, update, fix, or validate an API Governance ruleset (Validation Profile). Covers governance rules for OpenAPI, RAML, AsyncAPI, MCP servers, Anypoint API instances, and API projects. Trigger phrases include "governance ruleset", "validation profile", "governance rule", "API conformance", "enforce policy", "create ruleset", "validate ruleset".
fda-database
jaechang-hits/sciagent-skills
Query openFDA REST API for adverse events (FAERS), labeling, product info, recalls, enforcement. Search by drug name, ingredient, MedDRA, or NDC. 1k req/day no key; 120k with free key. For trials use clinicaltrials-database-search; for structures use drugbank-database-access or chembl-database-bioactivity.
dotnet-api-versioning
wshaddix/dotnet-skills
Versioning HTTP APIs. Asp.Versioning.Http/Mvc, URL segment, header, query string, sunset.
django-coder
majesticlabs-dev/majestic-marketplace
Build Django applications with models, views, forms, templates, REST APIs, and modern Django 5.x patterns.
go-expert
oimiragieo/agent-studio
Go programming expert including APIs, gRPC, concurrency, and best practices
graphql-expert
oimiragieo/agent-studio
GraphQL expert including schema design, Apollo Client/Server, and caching
api-design-patterns
nickcrew/claude-cortex
Comprehensive REST and GraphQL API design patterns with versioning, pagination, error handling, and HATEOAS principles. Use when designing APIs, defining endpoints, or architecting service contracts requiring production-grade patterns.
creating-springboot-projects
a-pavithraa/springboot-skills-marketplace
Creates Java 25 and Spring Boot 4 project structures, scaffolds, and implementation starting points for new services, REST APIs, and modular backends. Use when the task is to initialize a Spring Boot project, choose an architecture, select Spring Boot 4 features, or apply the bundled templates and references in this skill. Do not use for migrating existing projects or for isolated JPA/repository work without broader project-creation context.
alterlab-cbioportal
alterlab-ieu/alterlab-academic-skills
Query cBioPortal via its keyless REST API for cancer genomics across TCGA, GENIE, MSK-IMPACT and hundreds of studies — somatic mutations, copy-number alterations (GISTIC), mRNA/protein expression, structural variants, and patient-level clinical/survival data. Use when asked how often a gene is mutated/amplified/deleted in a tumor type, to profile oncogenes or tumor suppressors across cancers (pan-cancer alteration frequency), to pull patient-level mutations joined to OS/clinical outcomes, or to validate a cancer target from cohort genomics. For germline variant pathogenicity use alterlab-clinvar; for mutational-signature (SBS) decomposition use alterlab-cosmic; for CRISPR/RNAi gene-dependency use alterlab-depmap; for aggregated target-disease evidence use alterlab-opentargets. Part of the AlterLab Academic Skills suite.
abp-api-implementation
thapaliyabikendra/ai-artifacts
Implement REST APIs in ABP Framework with AppServices, DTOs, pagination, filtering, and authorization. Use when building API endpoints for ABP applications.
generating-documentation
ancoleman/ai-design-components
Generate comprehensive technical documentation including API docs (OpenAPI/Swagger), code documentation (TypeDoc/Sphinx), documentation sites (Docusaurus/MkDocs), Architecture Decision Records (ADRs), and diagrams (Mermaid/PlantUML). Use when documenting APIs, libraries, systems architecture, or building developer-facing documentation sites.
aliyun-anytrans-translate
cinience/alicloud-skills
Use when managing Alibaba Cloud TongyiTranslate (AnyTrans) via OpenAPI/SDK, including the user needs translation service resource operations in Alibaba Cloud, including list/create/update actions, task status checks, and troubleshooting AnyTrans API workflows.
alterlab-gwas
alterlab-ieu/alterlab-academic-skills
Query the NHGRI-EBI GWAS Catalog REST API for SNP-trait associations, retrieving variants by rs ID, disease/trait, or gene along with p-values and summary statistics. Use when investigating genome-wide association study hits, mapping a SNP or rsID to traits, building polygenic risk scores, or doing genetic epidemiology lookups. Part of the AlterLab Academic Skills suite.
api-design
miles990/claude-software-skills
RESTful, GraphQL, gRPC, and API best practices
action-policy-coder
majesticlabs-dev/majestic-marketplace
Use proactively for authorization with ActionPolicy. Creates policies, scopes, and integrates with GraphQL/ActionCable. Preferred over Pundit for composable, cacheable authorization.
springdoc-openapi
claude-dev-suite/claude-dev-suite
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blindpay
blindpaylabs/blindpay-skills
Use when integrating with BlindPay for bank payouts and payins, stablecoin on-ramp and off-ramp, customer KYC/KYB, bank accounts, virtual accounts, managed and blockchain wallets, transfers, partner fees, or webhooks.
alterlab-bindingdb
alterlab-ieu/alterlab-academic-skills
Query BindingDB for measured protein-ligand binding affinities (Ki, Kd, IC50, EC50) via its keyless REST API or the full TSV download, searching by target (UniProt ID), compound (SMILES), or pathogen. Use when looking up experimental binding constants, profiling inhibitors of a protein target, doing lead optimization, polypharmacology analysis, or structure-activity relationship (SAR) studies; for curated bioactivity mining or drug-like compound library screening at scale prefer alterlab-chembl instead. Part of the AlterLab Academic Skills suite.
openapi-codegen
claude-dev-suite/claude-dev-suite
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golang-gin-swagger
henriqueatila/golang-gin-best-practices
Swagger/OpenAPI docs for Go Gin with swaggo/swag. Use when adding API docs, Swagger UI, endpoint annotations, or generating swagger.json for a Gin application.
alterlab-labarchive
alterlab-ieu/alterlab-academic-skills
Integrates the LabArchives electronic lab notebook (ELN) via its REST API — access notebooks, manage entries and attachments, back up notebooks, and bridge to Protocols.io, Jupyter, and REDCap. Use when automating LabArchives ELN workflows, programmatically reading/writing notebook entries or attachments, backing up a LabArchives notebook, or syncing it with Protocols.io, Jupyter, or REDCap. Part of the AlterLab Academic Skills suite.
alterlab-pubchem
alterlab-ieu/alterlab-academic-skills
Query PubChem via the PUG-REST API and PubChemPy across 110M+ compounds, searching by name, CID, or SMILES and retrieving molecular properties, bioactivity, and similarity/substructure matches. Use when looking up a chemical compound, converting names/SMILES to CIDs, fetching physicochemical properties, or running cheminformatics structure searches. Part of the AlterLab Academic Skills suite.
aliyun-cdn-manage
cinience/alicloud-skills
Use when managing Alibaba Cloud CDN via OpenAPI/SDK, including CDN domain onboarding and lifecycle operations, cache refresh/preload, HTTPS certificate updates, and log/monitoring data queries.
aliyun-fc-agentrun
cinience/alicloud-skills
Use when managing Function Compute AgentRun resources via OpenAPI (runtime, sandbox, model, memory, credentials), including creating runtimes/endpoints, querying status, and troubleshooting AgentRun workflows.
ccxt-java
ccxt/ccxt
CCXT cryptocurrency exchange library for Java developers. Covers both REST API (standard) and WebSocket API (real-time). Helps install CCXT, connect to exchanges, fetch market data, place orders, stream live tickers/orderbooks, handle authentication, and manage errors in Java projects. Use when working with crypto exchanges in Java applications, trading systems, or financial software. Requires Java 21+.
aliyun-rds-supabase
cinience/alicloud-skills
Use when managing Alibaba Cloud RDS Supabase (RDS AI Service 2025-05-07) via OpenAPI, including creating, starting/stopping/restarting instances, resetting passwords, querying endpoints/auth/storage, configuring auth/RAG/SSL/IP whitelist, and listing instance details or conversations.
competition-graphql-rpc-drift
zhaoxuya520/reverse-skill
Internal downstream skill for ctf-sandbox-orchestrator. CTF-sandbox workflow for GraphQL schemas, persisted queries, RPC manifests, generated clients, OpenAPI drift, hidden operations, and contract-to-handler mismatches. Use when the user asks to inspect GraphQL or RPC requests, compare client contracts to live handlers, recover hidden operations, trace generated clients, or explain how schema or contract drift produces the decisive behavior. Use only after `$ctf-sandbox-orchestrator` has already established sandbox assumptions and routed here.
improving-drf-endpoints
posthog/posthog
Use when editing, reviewing, or auditing DRF viewsets and serializers in PostHog. Triggers on files in posthog/api/, products/*/backend/api/, products/*/backend/presentation/, or any file importing rest_framework. Covers field typing, schema annotations, enum collision fixes, and OpenAPI spec quality — everything that flows downstream into generated TypeScript types and MCP tools.
aliyun-adb-mysql
cinience/alicloud-skills
Use when managing Alibaba Cloud AnalyticDB for MySQL (ADB) via OpenAPI/SDK, including the user needs AnalyticDB resource lifecycle and configuration operations, status checks, or troubleshooting ADB API and cluster workflow issues.
openapi-parser
pactflow/pactflow-agent-skills
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payment-integration
mgd34msu/goodvibes-plugin
Load PROACTIVELY when task involves payments, billing, or subscriptions. Use when user says \"add payments\", \"integrate Stripe\", \"set up subscriptions\", \"add a checkout flow\", or \"handle billing webhooks\". Covers Stripe, LemonSqueezy, and Paddle integration, checkout sessions, subscription lifecycle management, webhook verification and handling, customer portal, metered billing, refunds, and PCI compliance considerations.
aliyun-cloudfw-manage
cinience/alicloud-skills
Use when managing Alibaba Cloud Cloud Firewall (Cloudfw) via OpenAPI/SDK, including the user requests firewall policy/resource operations, change management, status checks, or troubleshooting Cloud Firewall API workflows.
dependency-track-skill
julianobarbosa/claude-code-skills
Comprehensive guide for Dependency-Track - Software Composition Analysis (SCA) and SBOM management platform. USE WHEN deploying Dependency-Track, integrating with CI/CD pipelines, configuring vulnerability scanning, managing SBOMs, setting up policy compliance, troubleshooting installation issues, or working with the REST API.
langfuse-api
langfuse/skills
Interact with the Langfuse API. Use when user wants to query traces, fetch prompts, create datasets, manage scores, or do anything else via the Langfuse REST API.
xquik
bobmatnyc/claude-mpm-skills
Xquik X data automation API - Use REST or MCP for tweet search, user lookup, follower exports, media downloads, monitors, webhooks, giveaway draws, and confirmation-gated X actions.
laravel-billing
fusengine/agents
Use when implementing subscriptions, invoices, payment methods, webhooks, or billing portals with Laravel Cashier (Stripe or Paddle).
sast-graphql
utkusen/sast-skills
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aliyun-openapi-discovery
cinience/alicloud-skills
Use when discovering and reconciling Alibaba Cloud product catalogs from Ticket System, Support & Service, and BSS OpenAPI; fetch OpenAPI product/version/API metadata; and summarize API coverage to plan new skills. Use when you need a complete product list, product-to-API mapping, or coverage/gap reports for skill generation.
framework-adapters
dodopayments/skills
Guide for mounting official @dodopayments/* checkout, portal, and verified-webhook route handlers in supported web frameworks; use domain skills for payment and lifecycle logic.
add-guard-protection
arcjet/skills
Add Arcjet Guard protection to AI agent tool calls, background jobs, queue workers, and other code paths where there is no HTTP request. Covers rate limiting, prompt injection detection, sensitive information blocking, and custom rules using `@arcjet/guard` (JS/TS) and `arcjet.guard` (Python). Use this skill whenever the user wants to protect tool calls, agent loops, MCP tool handlers, background workers, or any non-HTTP code from abuse — even if they describe it as "rate limit my tool calls," "block prompt injection in my agent," "add security to my MCP server," or "protect my queue worker" without mentioning Arcjet or Guard specifically. Uses the Arcjet CLI (`npx @arcjet/cli` or `brew install arcjet`) for authentication and site/key setup.
setup-webhook
bolna-ai/skills
Configure Bolna webhooks for real-time call status and execution updates, validate webhook URLs, receive payloads, reconcile execution IDs, and build a local receiver. Use for CRM sync, dashboards, post-call automation, Make, Zapier, n8n, or custom backend integrations.
slash-graphql
membranedev/application-skills
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write-endpoints
cloudflare/chanfana
Comprehensive guide for building OpenAPI endpoints with chanfana - schema definition, request validation, CRUD operations, D1 database integration, and exception handling
dynamic-api-integration
oimiragieo/agent-studio
Discover, parse, and call external HTTP APIs at runtime using OpenAPI specs, tool templates, and iterative chaining. Adapted from UTCP (Universal Tool Calling Protocol) patterns for Node.js and Claude Code agents.
pinme-uniwebpay
glitternetwork/pinme
Use when generating, modifying, or reviewing PinMe Worker (Cloudflare Worker TypeScript) code that accepts payments through UniwebPay — payment links, products/prices, checkout sessions, payment status reads, refunds, subscriptions, or handling UniwebPay webhooks with @uniwebpay/sdk in a PinMe project.