“API testing”

Advises on API versioning strategies, designs deprecation flows, generates migration guides, and handles breaking vs non-breaking change classification.

Use when designing, building, or testing REST APIs — endpoint design, authentication, error handling, pagination, versioning, and OpenAPI documentation.

Validates whether an API request is correct based on provided inputs (method, URL, headers, body, auth, query params).

API endpoint design and testing for vehicle insurance data platform.

Use this skill when building with Bun runtime — Bun APIs, testing, package management, shell scripting, hot reload, SQLite, file I/O.

Interactively test any ChainGPT API endpoint.

Scaffold, validate, format, and run YAML.mmt API tests.

Intelligent system governor that continuously shadow-tests APIs for performance while enforcing strict financial and security guardrails against runaway costs.

Loops MCP by usefulapi

usefulapi.io

Manage Loops contacts, mailing lists, and transactional/event emails.

Turn manual cases into Playwright E2E automation run in a browser: page objects, helpers, bug evidence, reports.

Design and diagnose Endly integration and e2e tests with isolated fixtures, sequence-backed IDs, API and database assertions, and focused reruns.

Comprehensive documentation guide for Golang projects, covering godoc comments, README, CONTRIBUTING, CHANGELOG, Go Playground, Example tests, API docs, and…

When the user wants to plan, design, or implement an A/B test or experiment, or build a growth experimentation program.

Generates client SDK code, API wrapper libraries, request/response models, and language-specific usage patterns for any REST API.

Designs event-driven architectures, webhook systems, API chaining flows, ETL pipelines, and integration patterns between services.

Use when reviewing PRs for the TypeScript Delivery SDK—API, tests, bundler impact, semver.

Audit established domain terms across glossaries, ADRs, code, schemas, APIs, tests, UI, and external contracts.

Regression testing strategies for AI-assisted development.

Use for SplitShare security review, filesystem attack cases, transfer robustness, API integration tests, Playwright E2E, or release acceptance evidence.

Regression testing strategies for AI-assisted development.

Test authorized web, API, authentication, and AI-assisted application boundaries with Hercules when a specific application weakness or workflow needs focused…

Designs GraphQL schemas, resolvers, query/mutation/subscription patterns, and protobuf definitions for gRPC services.

Use for flaky or nondeterministic tests, especially local-vs-CI inconsistencies.

Provide comprehensive techniques for testing REST, SOAP, and GraphQL APIs during bug bounty hunting and penetration testing engagements.