One search for your own team's files and the public ecosystem. See how real projects write their agent instructions, and bring the good ideas home.
jdanigoSkilljdanigo/hydraia/skills/e2e-testing/SKILL.md
Use when writing or maintaining end-to-end tests — Playwright (preferred) or Cypress critical-flow suites. Pattern playbook: page objects, stable selectors, fixtures and isolation, condition-based waiting, flaky quarantine, CI wiring. Backs the e2e-runner agent.
cosmixSkillcosmix/loom/skills/loom-testing/SKILL.md
Test implementation across unit, integration, e2e, security, infrastructure, data pipeline, and ML domains.
OpenClaudiaSkillOpenClaudia/openclaudia-skills/skills/ab-test-setup/SKILL.md
Design, plan, and analyze A/B tests with statistical rigor. Use when the user asks about A/B testing, split testing, experiment design, statistical significance, sample size calculation, test duration, multivariate testing, or conversion experiments. Trigger phrases include "A/B test", "split test", "experiment", "statistical significance", "sample size", "test duration", "which version wins", "conversion experiment", "hypothesis test", "variant testing".
Prisma-Labs-DevSkillPrisma-Labs-Dev/apple-skills/skills/swift-testing/SKILL.md
API reference: Swift Testing framework. @Test, @Suite, #expect, #require, traits, parameterized tests, migrating from XCTest.
MicrosoftSkillmicrosoft/testfx/.agents/skills/test-anti-patterns/SKILL.md
Audits existing test code in any language for anti-patterns and quality issues — produces a severity-ranked report (Critical / Warning / Info) with concrete code-level fixes. Polyglot: .NET (MSTest/xUnit/NUnit/ TUnit), Python (pytest/unittest), TS/JS (Jest/Vitest/Mocha/node:test), Java (JUnit/TestNG), Go, Ruby (RSpec/Minitest), Rust, Swift, Kotlin (JUnit/Kotest), PowerShell (Pester), C++ (GoogleTest/Catch2). INVOKE when asked to audit, review, rank, or find problems in existing tests — "audit my tests", "test smell audit", "rank by severity", tests that pass but verify nothing, no/missing assertions, swallowed exceptions, always-true / self-comparing / tautological assertions, broad exception types, flakiness (sleep/Date.now/time.sleep), ordering dependency, shared global state, duplicated tests, magic values, missing await on async assertions. DO NOT USE FOR: writing new tests (use code-testing-agent, or writing-mstest-tests for MSTest); running tests (use run-tests); framework migration.
SentrySkillgetsentry/sentry-java/.claude/skills/test/SKILL.md
Run tests for a specific SDK module. Use when asked to "run tests", "test module", "run unit tests", "run system tests", "run e2e tests", or test a specific class. Auto-detects unit vs system tests. Supports interactive mode.
LambdaTestSkillLambdaTest/agent-skills/flutter-testing-skill/SKILL.md
Generates Flutter widget tests, integration tests, and golden tests in Dart. Supports local execution and TestMu AI cloud for real device testing. Use when user mentions "Flutter", "widget test", "WidgetTester", "testWidgets", "flutter_test", "integration_test". Triggers on: "Flutter", "widget test", "Dart test", "testWidgets", "WidgetTester", "golden test".
openvettaSkillopenvetta/open-vetta/.agents/skills/vetta-testing/SKILL.md
为 OpenVetta 的功能变更、Bug 修复、重构、公共合同和 UI 交互设计、编写或审查测试；在决定测试范围、补充回归测试、覆盖用户常见使用流程或评估测试质量时使用。纯文档或没有运行时行为变化的编辑不使用。
MicrosoftSkillmicrosoft/testfx/.agents/skills/grade-tests/SKILL.md
Grades a specified set of test methods individually and produces a concise table mapping each test (fully-qualified name) to a letter grade (A–F), a score band, pseudo-mutation resilience, a one-line note, and a concrete improvement for every grade below A — designed to be posted as a PR comment. Use when the caller wants per-test feedback on a curated list of methods (for example, the new or modified tests in a pull request), not a suite-wide audit. Polyglot: .NET (MSTest/xUnit/NUnit/TUnit), Python (pytest/unittest), TS/JS (Jest/Vitest/Mocha/node:test), Java (JUnit/TestNG), Go, Ruby (RSpec/Minitest), Rust, Swift (XCTest/Swift Testing), Kotlin (JUnit/Kotest), PowerShell (Pester), C++ (GoogleTest/Catch2/doctest). Input is a list of test methods (or method bodies / file+line spans); output is a compact markdown table plus a short summary. DO NOT USE FOR: full suite audits (use test-quality-auditor agent or test-anti-patterns), writing new tests (use code-testing-generator agent or writing-mstest-tests), fixing failures, or measuring code coverage.
mattgierhartSkillmattgierhart/PRD-driven-context-engineering/.claude/skills/prd-v07-test-planning/SKILL.md
Define test cases BEFORE implementation, ensuring every API, business rule, and user journey has verifiable acceptance criteria during PRD v0.7 Build Execution. Triggers on requests to define tests, plan test coverage, create test cases, or when user asks "define tests", "test planning", "what to test?", "test cases", "test coverage", "TEST-", "test-first". Consumes EPIC- (scope), API-, DBT-, BR-, UJ-. Outputs TEST- entries with Given-When-Then format. Feeds v0.7 Implementation Loop.
loulanyueSkillloulanyue/awesome-claude-notes/skills/golang-testing/SKILL.md
Go testing patterns including table-driven tests, subtests, benchmarks, fuzzing, and test coverage. Follows TDD methodology with idiomatic Go practices.
altafinoSkillaltafino/FableClaudeMDForOpus/.claude/skills/kit-testing/SKILL.md
Testing guardrails pack — test authorship quality, regression-proof discipline, expectation-change audit. Use when writing tests, adding coverage, or reviewing test quality.
ElasticSkillelastic/kibana/.agents/skills/flaky-test-investigator/SKILL.md
Investigate Scout and FTR flaky test failures in Kibana. Use when triaging a failed-test issue, a Buildkite-reported failure, a test path that has been failing intermittently, or any time the user asks to look at a flaky test, deflake a test, or stabilize a test.
guoliang1114-boopSkillguoliang1114-boop/AriaAI/skills/itgc-testing/SKILL.md
执行IT一般控制测试，基于COBIT框架，覆盖访问控制、变更管理、系统开发和IT运维四大领域
ShopifySkillShopify/hydrogen/.claude/skills/e2e-test-writing/SKILL.md
Guide for writing high-quality Playwright E2E tests for Hydrogen. Use when the user asks to "write e2e tests", "add playwright tests", "test this feature end-to-end", "write recipe tests", "add integration tests", or mentions Playwright, E2E testing, or test coverage for user-facing features.
CadastoSkillCadasto/go-coding-plugin/skills/go-testing/SKILL.md
Idiomatic Go testing. This skill should be used when the user writes or reviews Go tests, benchmarks or fuzz targets — any _test.go file, table-driven `t.Run`, a can-fail control proving a guard is mutation-detectable, `t.Parallel` and what cannot run under it, `t.Context`, `t.TempDir` vs `t.ArtifactDir`, `testing.B.Loop`, `Example` functions with `// Output:`, stable comparisons of serialised or map-derived output, `testing/synctest` for time and concurrency, the race detector, goroutine-leak checks, golden files, or failure messages that diagnose. Pair with `go test -race`. Go only; error wrapping belongs to go-errors.
hamzaciftciSkillhamzaciftci/coding-orchestra/skills/testing-qa/SKILL.md
Testing and QA - unit integration E2E API auth role IDOR and security regression tests, edge and state-screen tests, smoke test, honest coverage reporting. Use to write tests or set up QA for a project.
lgzarturoSkilllgzarturo/codeconductor/.agents/skills/testing-tdd/SKILL.md
name: testing-tdd description: Guides agents through Red-Green-Refactor with runner-captured evidence. Use when running /cc-tdd-cycle, writing tests before implementation, or Global TDD required is yes. --- # Test-Driven
GoogleSkillgoogle/crosvm/.agents/skills/crosvm_testing/SKILL.md
Skill to assist with running tests and managing test VMs in the crosvm repository.
IngvarConsultingSkillIngvarConsulting/unica/.agents/skills/unica-testing/SKILL.md
Выбор, написание, запуск и ревью тестов самого Unica — граница проверки, размеры small/medium/large, Rust nextest, Python unittest и разбор падений. Используй при изменении проверок или проверяемого поведения; тесты прикладного кода 1С относятся к unica:test-authoring.
Plain text files in a repository that tell a coding agent how the project works: commands to run, conventions to follow and things to avoid. CLAUDE.md, AGENTS.md, cursor rules and skills are the common kinds.
CLAUDE.md is read by Claude Code. AGENTS.md is an open format that Codex, Cursor and other agents read. Many projects keep one and point the other at it.
A folder with a SKILL.md that describes one capability, such as filling PDFs or reviewing code. The agent loads it only when the task calls for it.
Your agents already can, over MCP, limited to the files you're allowed to read. Searching them from this page is coming.
