Claude skills and agent skills

biomejsSkill

testing-codegen

biomejs/biome/.agents/skills/testing-codegen/SKILL.md

Use this skill when selecting or running Biome test fixtures, quick tests, `insta` snapshot workflows, expectation comments, orphan checks, or required code generators. Do not use for subsystem implementation design.

onyx-dot-appReads credentialsSkill

playwright-e2e-tests

onyx-dot-app/onyx/.agents/skills/playwright/SKILL.md

Write and maintain Playwright end-to-end tests for the Onyx application. Use when creating new E2E tests, debugging test failures, adding test coverage, or when the user mentions Playwright, E2E tests, or browser testing.

langgeniusSkill

frontend-testing

langgenius/dify/.agents/skills/frontend-testing/SKILL.md

Use when writing or changing Vitest or React Testing Library tests under `web/` or `packages/dify-ui/`, or when the user explicitly requests frontend test strategy, including evaluation of an existing strategy. Do not use for frontend code-review-only requests, general testability discussion, Python tests, or Cucumber/Playwright E2E.

Often used withbackend-code-review·frontend-code-review

every-appSkill

test-audit

every-app/open-seo/.agents/skills/test-audit/SKILL.md

Invoke whenever writing, changing, reviewing, or sweeping Vitest tests in this repo. Authoring gate for new or changed tests, plus an audit workflow for low-value, implementation-coupled, or duplicative tests and the test-only production seams they keep alive. Use when asked to add tests, review tests, clean up tests, or when a PR touches *.test.ts.

langflow-aiSkill

frontend-testing

langflow-ai/langflow/.agents/skills/frontend-testing/SKILL.md

Write, review, and debug Jest and React Testing Library unit and integration tests for Langflow frontend components, hooks, utilities, and Zustand stores.

Often used withbackend-code-review·frontend-code-review

ag-ui-protocolSkill

agui-dotnet-unit-tests

ag-ui-protocol/ag-ui/.github/skills/agui-dotnet-unit-tests/SKILL.md

Author unit tests for the AG-UI .NET SDK (the *.UnitTests projects), following the SDK's serialization and compatibility conventions. USE FOR: adding unit-test coverage for a new type/method in AGUI.Abstractions/Formatting/Protobuf/Client/Server, event serialization round-trips, JsonDocument property-name assertions, backward-compatibility fixtures against TypeScript JSON, protobuf codec round-trips, client builder/handler tests, server ChatResponseUpdate conversion tests, SSE formatter tests. DO NOT USE FOR: HTTP pipeline / WebApplicationFactory end-to-end tests (use the agui-dotnet-integration-tests skill), cross-language TS↔C# server-parity tests (use the cross-language test skill).

No other project uses it yet

langbot-appReads credentialsSkill

langbot-testing

langbot-app/LangBot/skills/skills/langbot-testing/SKILL.md

Test LangBot WebUI and core product flows with an automated browser and backend logs. Use when validating the configured LangBot frontend, pipeline Debug Chat, model provider setup and test buttons, bot and knowledge-base UI flows, or troubleshooting failed LangBot end-to-end tests.

No other project uses it yet

handsontableSkill

test-writing-discipline

handsontable/handsontable/.claude/skills/test-writing-discipline/SKILL.md

Use when writing, fixing, or reviewing tests for any Handsontable change (unit, E2E, or wrapper), and whenever a test is red during feature work. Enforces that tests prove intended behavior – not just execute code, and never "green for the sake of green". Covers intent-first (write the test from the requirement, ideally before the code), deciding whether the code or the test is wrong when red (default: the code), the banned ways of faking green, write-the-failing-test-first, verify-with-a-real-run, no hollow assertions, not mocking the unit under test, and migrating broken legacy tests.

verdaccioSkill

testing-changes

verdaccio/verdaccio/.agents/skills/testing-changes/SKILL.md

Select and run the checks that actually cover a change in the verdaccio monorepo — rebuild the touched packages, run their tests and their dependents' tests, the api integration suite, the e2e CLI battery or the Cypress UI suite when the change is client- or UI-visible — and recognise the cases where a scoped run passes without testing anything. Use whenever verifying a change before committing or pushing, or when deciding what to run after an edit.

maxrave-devSkill

android-testing

maxrave-dev/SimpMusic/.claude/skills/android-testing/SKILL.md

Comprehensive testing strategy involving Unit, Integration, Hilt, and Screenshot tests.

FalkorDBSkill

test

FalkorDB/FalkorDB/.claude/skills/test/SKILL.md

Run FalkorDB's test suites - Rust unit tests, Python e2e/function/MVCC/concurrency tests, openCypher TCK compliance tests, and flow tests. Use when asked to run, narrow down, or debug a failing test, or to decide which suite covers a change.

handsontableSkill

handsontable-unit-testing

handsontable/handsontable/.claude/skills/handsontable-unit-testing/SKILL.md

Use when writing or modifying Jest unit tests (*.unit.js or *.unit.ts) or TypeScript type tests (*.types.ts) for Handsontable core, plugins, or utilities, or when a bug fix or internal refactor needs unit or type test coverage - covers Jest setup, test location conventions, mocking patterns, module aliases, type test patterns (no declare, real assignments, ESM + UMD patterns), and when to choose unit tests over E2E tests

bmad-code-orgSkill

bmad-qa-generate-e2e-tests

bmad-code-org/BMAD-METHOD/skills/bmad-qa-generate-e2e-tests/SKILL.md

Add end-to-end and API tests for features that already work, following the project''s existing test harness. Use when the user asks for e2e tests, API tests, or automated coverage of an existing feature, or says "create qa automated tests for [feature]". Not for unit tests on work in flight, which the build writes.

Often used withbmad-dev-auto·bmad-checkpoint-preview·bmad-editorial-review

ElasticSkill

flaky-test-investigator

elastic/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.

No other project uses it yet

AWSSkill

cdk-testing-review

aws/aws-cdk/skills/cdk-review/cdk-testing-review/SKILL.md

AWS CDK test-coverage reviewer. Use when a PR adds or changes tests (`**/*.test.ts`, `integ.*.ts`, `*.snapshot`) or ships new functionality, branches, feature-flag states, CFN properties, or cross-service behavior that should be tested — deciding first what coverage each change OWES (a unit test? an integ test? both? already covered? exempt?), then judging whether the PR's tests DISCHARGE it: meaningful assertions over non-asserting tests, edge/negative/feature-flag cases, required integ tests, snapshot-as-synthesized-template diffs, deploy-time assertions, and legitimate exemptions.

remotion-devSkill

writing-tests

remotion-dev/remotion/.agents/skills/writing-tests/SKILL.md

Guidance for explicitly requested new tests and for updating or reviewing existing tests in the Remotion repository.

metabaseReads credentialsSkill

mutation-testing

metabase/metabase/.claude/skills/mutation-testing/SKILL.md

Run mutation testing on a Clojure namespace, generate tests to kill surviving mutations, and open draft PRs with Linear issue tracking.

carbon-languageSkill

Toolchain tests

carbon-language/carbon-lang/.agents/skills/toolchain_tests/SKILL.md

name: Toolchain tests description: Instructions for authoring, structuring, and running toolchain tests using the file_test infrastructure. --- # Toolchain tests ## Introduction This skill provides guidelines and patterns for creating and updating

PostHogSkill

fixing-flaky-tests

PostHog/posthog/.agents/skills/fixing-flaky-tests/SKILL.md

Guides an agent through reproducing, root-causing, fixing, and validating flaky tests in the PostHog monorepo. Use when a test fails intermittently in CI but passes on rerun or locally, when `hogli ci:insights` or the debugging-ci-failures skill classifies a failure as a flaky test, when given a GitHub Actions URL for a flaky job, when asked to check Trunk Flaky Tests for a test, PR, or master, or when asked to deflake, stabilize, or fix a flaky Jest, pytest, or Playwright test. Core discipline: reproduce locally before changing anything, fix the root cause (never mask it with sleeps, retries, or bigger timeouts), and prove the fix with an N-run validation loop sized to the observed failure rate. Stabilizing is not the only valid outcome — the skill also gates whether the test should exist, so deleting a test that catches nothing real, or re-leveling one that flakes because of the level it runs at, are first-class endings.

reactSkill

test

react/react/.claude/skills/test/SKILL.md

Use when you need to run tests for React core. Supports source, www, stable, and experimental channels.