Skills real projects publish on GitHub, most starred first. Each one says what it will make an agent do before you copy it.
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glideappsSkillglideapps/quicktype/.agents/skills/enable-small-tests/SKILL.md
Find and ship small quicktype fixes that enable disabled tests, using shared inputs and existing language fixtures. Use for batches of test-enabling PRs or their review, conflict, and CI follow-up; prioritize Dart, Swift, and TypeScript unless directed otherwise.
Steady2 mentions in 2 weeks
No other project uses it yet
saleorSkillsaleor/saleor/.claude/skills/filter-benchmark/SKILL.md
Benchmark and performance-test Django ORM filters on large datasets. Use this skill whenever the user wants to test filter performance, check query plans with EXPLAIN ANALYZE, generate bulk test data for filters, verify index usage, or benchmark any queryset filter in the Saleor codebase. Trigger this even when the user says things like "test the filter on a big dataset", "check if the index is used", "generate data for performance testing", "run explain analyze on this filter", or "benchmark this query".
PostHogSkillPostHog/posthog/.agents/skills/testing-mcp-tools-locally/SKILL.md
Set up the local dev environment, seed data, and API keys to test the staff-only managed migrations MCP tools (managed-migrations-support-list, managed-migrations-support-get) end to end. Use when testing batch import support tooling, debugging MCP tool responses or discovery (tools not appearing), or verifying the support API before deploying. Covers the discovery gate: hidden scope, is_staff, user:read, and why wildcard keys and OAuth never work.
PostHogSkillPostHog/posthog/.agents/skills/extending-hobby-smoke-tests/SKILL.md
Design, extend, review, or debug PostHog Hobby end-to-end smoke tests in bin/hobby-ci.py and .github/workflows/ci-hobby.yml. Use when adding an ingestion round trip, deciding whether a product belongs in Hobby CI, changing the CI Hobby service topology or API-key scopes, or diagnosing a smoke test that captures data but cannot query it.
alvinunrealDeletes or force-pushesSkillalvinunreal/oh-my-opencode-slim/.agents/skills/release-smoke-test/SKILL.md
Test an oh-my-opencode-slim release candidate or bugfix before publishing. Use when validating a packed plugin artifact, release branch, crash fix, OpenCode runtime compatibility, or model-specific smoke test such as OpenCode 1.17.11 message transform regressions.
streamlitSkillstreamlit/streamlit/.claude/skills/improving-frontend-coverage/SKILL.md
Runs frontend unit tests with coverage, analyzes coverage reports, and implements meaningful tests to increase coverage by ~0.2%. Use when you want to systematically improve frontend test coverage with high-value test cases.
Steady4 mentions in 2 weeks
No other project uses it yet
streamlitSkillstreamlit/streamlit/.claude/skills/improving-python-coverage/SKILL.md
Runs Python unit tests with coverage, analyzes coverage reports, and implements meaningful tests to increase coverage by ~0.2%. Use when you want to systematically improve Python test coverage with high-value test cases.
Steady4 mentions in 2 weeks
No other project uses it yet
MicrosoftSkillmicrosoft/inshellisense/.github/skills/tui-test/SKILL.md
Drive, inspect, assert on, record, and watch a real terminal from the command line with the tui-test cli. Use when running shells (bash, zsh, fish, PowerShell, pwsh, cmd, xonsh, elvish, nushell) or TUI programs (vim, less, top, etc.) in a headless PTY; sending keystrokes, key combos, or mouse input; resizing, writing raw bytes, or signaling the child; waiting for a command to finish or the screen to settle; asserting on terminal text, colors, exit codes, output, or snapshots; capturing text or full-color SVG screenshots; recording and replaying asciinema sessions; watching a live cli session while an agent drives it; or driving process-local sessions from Rust, Python, or Node.
Steady2 mentions in 2 weeks
1 project uses a version of this
mastra-aiReads credentialsSkillmastra-ai/mastra/.claude/skills/smoke-test/SKILL.md
Create a Mastra project using create-mastra and smoke test the studio in Chrome using Chrome MCP server
daggerSkilldagger/dagger/skills/engine-debugging/SKILL.md
Run Dagger repo tests and debug Dagger engine, core, dagql, filesync, cache, CI trace, panic, hang, leak, and performance issues. Use whenever an agent needs to run tests, choose a test command, or interpret test output in this repository, even before a failure is diagnosed; also use for engine-dev tests, Dagger Cloud trace inspection, debug endpoints or pprof, goroutine dumps, panics, hangs, leaks, performance issues, and /debug/dagql/cache snapshots.
No other project uses it yet
pingcapSkillpingcap/tidb/.agents/skills/tidb-test-diff-triage/SKILL.md
Investigate unexpected TiDB plan or test-result diffs unexplained by the change, including merge and environment effects.
DonchitosSkillDonchitos/Claude-Code-Game-Studios/.claude/skills/soak-test/SKILL.md
Soak test protocol for extended play — what to observe and log for slow leaks, fatigue, late-appearing edge cases.
Steady8 mentions in 2 weeks
8 projects use a version of this
DonchitosSkillDonchitos/Claude-Code-Game-Studios/.claude/skills/test-flakiness/SKILL.md
Find flaky tests from CI logs — aggregates pass rates, spots intermittent failures, recommends quarantine. After multiple runs.
Steady8 mentions in 2 weeks
8 projects use a version of this
lwouisDeletes or force-pushesSkilllwouis/alt-tab-macos/.claude/skills/coverage-explore/SKILL.md
Measure AltTab test coverage and record it as documentation. Runs the Test scheme with coverage into a throwaway result bundle, parses the per-file/region report, refreshes the per-feature badge atop each `*Specs.md` and the root `src/coverage.md` table, then suggests the highest-value missing tests. These two markdown outputs are the ONLY stored coverage — no lcov/html/xcresult is kept, and routine test runs don't gather coverage. Use to refresh coverage docs, find untested kernel branches, or decide what to test next.
No other project uses it yet
cliSkillcli/cli/.github/skills/writing-acceptance-tests/SKILL.md
Use when adding or changing GitHub CLI acceptance tests, txtar scripts, testdata groups, repository fixtures, or acceptance harness behavior.
streamlitSkillstreamlit/streamlit/.claude/skills/assessing-external-test-risk/SKILL.md
Assesses whether branch or PR changes are high-risk for externally hosted or embedded Streamlit usage and recommends whether external e2e coverage with `@pytest.mark.external_test` is needed. Use during code review, PR triage, or test planning when changes touch routing, auth, websocket/session behavior, embedding, assets, cross-origin behavior, SiS/Snowflake runtime, storage, or security headers.
Steady4 mentions in 2 weeks
No other project uses it yet
DonchitosSkillDonchitos/Claude-Code-Game-Studios/.claude/skills/test-evidence-review/SKILL.md
Quality review of test files and evidence — goes beyond existence, evaluates assertion coverage. ADEQUATE/INCOMPLETE/MISSING/NOT ASSESSED per story.
Steady8 mentions in 2 weeks
9 projects use a version of this
handsontableSkillhandsontable/handsontable/.claude/skills/handsontable-e2e-testing/SKILL.md
Use ONLY when maintaining the FROZEN legacy Jasmine/Puppeteer E2E suite (*.spec.js) – editing an existing spec, or migrating a broken one to Playwright. NOT for new E2E: new E2E is Playwright, use the `handsontable-playwright-e2e` skill. Covers the legacy boilerplate, async/await rules, global helpers, event simulation, and theme-agnostic assertions.
RustPythonSkillRustPython/RustPython/.agents/skills/investigate-test-failure/SKILL.md
Investigate a failing RustPython test, compare with CPython behavior, and decide whether to implement a fix or prepare incompatibility issue details.
Steady3 mentions in 2 weeks
No other project uses it yet
OpenAISkillopenai/openai-agents-python/.agents/skills/test-coverage-improver/SKILL.md
Measure Python SDK coverage or address measured coverage gaps. Use for coverage audits and metric regressions, not routine test additions.
Steady2 mentions in 2 weeks
4 projects use a version of this
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