API Development

Technical writing expert for API documentation, README files, tutorials, changelog management, and developer documentation. Covers style guides, information architecture, versioning docs, OpenAPI/Swagger, and documentation-as-code. Activates for technical writing, API docs, README, changelog, tutorial writing, documentation, technical communication, style guide, OpenAPI, Swagger, developer docs.

Design RESTful APIs following Grey Haven standards - FastAPI routes, Pydantic schemas, HTTP status codes, pagination, filtering, error responses, OpenAPI docs, and multi-tenant patterns. Use when creating API endpoints, designing REST resources, implementing server functions, configuring FastAPI, writing Pydantic schemas, setting up error handling, implementing pagination, or when user mentions 'API', 'endpoint', 'REST', 'FastAPI', 'Pydantic', 'server function', 'OpenAPI', 'pagination', 'validation', 'error handling', 'rate limiting', 'CORS', or 'authentication'.

Manage API versioning strategy for Hono routes in apps/api/src/v1. Use when creating new API versions or migrating endpoints between versions.

Use when building high-performance async Python APIs with FastAPI and Pydantic V2. Invoke for async SQLAlchemy, JWT authentication, WebSockets, OpenAPI documentation. Keywords: FastAPI, Pydantic, async, SQLAlchemy, JWT, OpenAPI.

Use when adding docstrings, creating API documentation, or building documentation sites. Invoke for OpenAPI/Swagger specs, JSDoc, doc portals, tutorials, user guides. Keywords: documentation, docstrings, OpenAPI, Swagger, JSDoc, API docs, tutorials.

Generate comprehensive API endpoint tests for REST and GraphQL APIs. Creates tests for all HTTP methods, status codes, authentication, and validation.

Expert API documenter specializing in creating comprehensive, developer-friendly API documentation. Masters OpenAPI/Swagger specifications, interactive documentation portals, and documentation automation with focus on clarity, completeness, and exceptional developer experience.

Context and working knowledge for Calci’s prediction-market domain, which is powered by Kalshi. Use this skill whenever the user asks about Calci prediction markets, Kalshi markets, tickers, order books, pricing, settlement, or the Kalshi API/WebSocket.

tRPC framework patterns and best practices for type-safe APIs. Use when working with tRPC routers, procedures, subscriptions, middleware, or client setup. Covers WebSocket subscriptions, Zod validation, error handling, context creation. Triggers: trpc, router, procedure, subscription, publicProcedure, middleware, createTRPCRouter, wsLink, createWSClient, TRPCError, zod input, initTRPC.

Cloudflare Workers Runtime APIs including Fetch, Streams, Crypto, Cache, WebSockets, and Encoding. Use for HTTP requests, streaming, encryption, caching, real-time connections, or encountering API compatibility, response handling, stream processing errors.

Implements CSRF protection using synchronizer tokens, double-submit cookies, and SameSite attributes. Use when securing web forms, protecting state-changing endpoints, or implementing defense-in-depth authentication.

TypeScript-first schema validation and type inference. Use for validating API requests/responses, form data, env vars, configs, defining type-safe schemas with runtime validation, transforming data, generating JSON Schema for OpenAPI/AI, or encountering missing validation errors, type inference issues, validation error handling problems. Zero dependencies (2kb gzipped).

Designs RESTful APIs with proper resource naming, HTTP methods, status codes, and response formats. Use when building new APIs, establishing API conventions, or designing developer-friendly interfaces.

Creates professional API documentation using OpenAPI specifications with endpoints, authentication, and interactive examples. Use when documenting REST APIs, creating SDK references, or building developer portals.

Reply to PR review comments using the correct GitHub API endpoint. Use when responding to inline code review feedback (not gh pr comment).

DeepSeek AI large language model API via curl. Use this skill for chat completions, reasoning, and code generation with OpenAI-compatible endpoints.

Design and implement RESTful API endpoints following REST principles, consistent naming conventions, and proper HTTP methods. Use this skill when creating or modifying API routes, controllers, or handlers in backend code. When implementing endpoint logic that handles HTTP requests (GET, POST, PUT, PATCH, DELETE). When working with API versioning, query parameters, or response formatting. When defining URL structures for resource-based endpoints. When setting up rate limiting or HTTP status code handling. When working with files like route definitions, controller files, API handler modules, or web framework configuration files.

HTTP API testing for TypeScript (Supertest) and Python (httpx, pytest). CoversREST APIs, GraphQL, request/response validation, authentication, and error handling.Use when user mentions API testing, Supertest, httpx, REST testing, endpoint testing,HTTP response validation, or testing API routes.

This skill provides comprehensive guidance for documenting SAP APIs following official SAP API Style Guide standards. It should be used when creating or reviewing API documentation for REST, OData, Java, JavaScript, .NET, or C/C++ APIs. The skill covers naming conventions, documentation comments, OpenAPI specifications, quality checklists, deprecation policies, and manual documentation templates. It ensures consistency with SAP API Business Hub standards and industry best practices. Keywords: SAP API, REST, OData, OpenAPI, Swagger, Javadoc, JSDoc, XML documentation, API Business Hub, API naming, API deprecation, x-sap-stateInfo, Entity Data Model, EDM, documentation tags, API quality, API templates

Language-agnostic API design patterns covering REST and GraphQL, including resource naming, HTTP methods, status codes, versioning, pagination, filtering, authentication, error handling, and schema design. Activate when working with APIs, REST endpoints, GraphQL schemas, API documentation, OpenAPI/Swagger, JWT, OAuth2, endpoint design, API versioning, rate limiting, or GraphQL resolvers.