Testing & QA Agent Skills

Enforces a mandatory pre-commit/pre-PR testing gate: detects the test stack, runs the full suite, fixes failures, creates minimal tests when none exist, and verifies coverage before allowing commits.

Provides guidance and best practices for writing idiomatic Ruby code, covering metaprogramming, Rails patterns, gem development, performance optimization, and testing.

Provides Rust testing patterns covering unit, integration, async, property-based tests, mocking, and coverage, following TDD methodology.

Runs throwaway experiments to validate feasibility, compare approaches, and surface unknowns before committing to a real build.

Reviews code diffs or explicit file sets through independent correctness and QA lenses, producing a severity-ordered verdict for pre-merge audits or review gates.

Extracts a language-agnostic ghost package (spec, tests, install and verify docs) from an existing repository, preserving behavior via tests.yaml and evidence bundles.

Guides adding characterization tests before modifying or refactoring untested legacy code, using the RGR workflow and strangler fig pattern to reduce risk.

Tests local web applications with Playwright, including server lifecycle management, DOM inspection, and screenshot capture.

Runs API, performance, load, stress, and HTTP tests using the basjoofan CLI with configurable concurrency, duration, and statistics output.

Structured workflow to reproduce, diagnose, plan, fix, verify, and record a bug fix, requiring a deterministic reproduction before diagnosis and minimal changes only.

Provides guidance and best practices for working with Cypress, covering setup, development, deployment, and troubleshooting.

Guides the red-green-refactor cycle for implementing features with test-driven development, including test quality guidelines, framework setup, and commit patterns.

Enforces language-specific coding rules, style guidelines, patterns, security, and testing standards by referencing a built-in guidelines bank.

Runs adversarial UI tests in a real browser, covering functional, accessibility, responsive, and UX checks, with diff-driven, exploratory, and parallel workflows.

Automates visual testing and UI interaction verification using browser automation after deploying features.

Write and run Perl tests using Test2::V0, Test::More, prove, mocking, and Devel::Cover coverage with a TDD workflow.

Generates, reviews, fixes, and migrates Playwright end-to-end tests, with templates, agents, and integrations for TestRail and BrowserStack.

Coordinates five specialized coding agents (linter, perf, refactor, security, test) to enforce quality gates across the development lifecycle, from lint enforcement through performance profiling, refactoring, security auditing, and test coverage.

Configures and runs static analysis and linting tools across multiple languages, integrating with CI/CD and security platforms.

Runs load, stress, and performance tests using k6, JMeter, and profiling tools, with capacity planning and benchmarking for APIs and backend services.

Implements features, fixes bugs, and refactors code by orchestrating domain-specific skills, following existing patterns, and verifying tests and lint pass.

Provides expert guidance on modern Rust development, covering async patterns, advanced type system features, and production-ready systems programming.

Creates a GitHub pull request with an auto-generated summary, running mandatory pre-commit and code-quality review gates, plus optional deep-review subagents, and posts findings into the PR body.

Accelerate JavaScript/TypeScript development with the Bun runtime, covering package management, bundling, testing, and migration from Node.js.

Catches type errors before runtime using static type checking with gradual typing, strict mode, and Protocol support for Python projects.

Guides through mocha test setup with step-by-step instructions, best practices, and production-ready configurations.

Build, review, debug, or test declarative statistical visualizations in Python with Altair and Vega-Lite, including chart marks, typed encodings, transforms, parameters, layers, facets, and specification export.

Provides guidance for using python-xxhash to implement fast non-cryptographic hashing, including algorithm selection, byte encoding, streaming updates, digest representation, and collision-aware identity for checksums, bucketing, and sampling.

Creates executable Polars dataframe contracts using Pandera's Polars backend for runtime validation of schemas, columns, and checks.

Write, review, debug, migrate, or test Python code using Pydantic v2 with explicit boundaries, validation, and serialization contracts.

Write, review, debug, or test Python datetime, date, timedelta, timezone, and zoneinfo code, especially UTC conversion, DST gaps and folds, recurring local schedules, parsing, and interval boundaries.

Enforces production-grade Python and AI engineering standards for FastAPI, LangChain/LangGraph, RAG pipelines, and LLM integrations, covering type safety, error handling, testing, and security.