Best test coverage skills for Claude Code, Codex and other agents.

Sets the test-writing workflow for the repository: risk-first scenario lists, behavior-focused Vitest tests, a full run before each commit and a coverage target.

iOfficeAI/AionUi

Records a project's quality bar in CONSTRAINTS.md and watches diffs for signs an agent quietly weakened it, such as suppressions, skipped tests or lowered thresholds.

addyosmani/agent-skills

Adds Worktrunk-specific rules to the tend CI workflows: Codecov polling, Rust test commands, labels and review criteria for pull requests handled in CI.

max-sixty/worktrunk

Reviews the tests added in a pull request for fix coverage, quality, edge cases and test type, and recommends lighter test types where they would do.

dotnet/maui

Takes a blocked community pull request in React Router and adds the missing tests, change file or docs so it can merge, working on the contributor's branch.

remix-run/react-router

Survey any codebase as a senior advisor and produce prioritized, self-contained implementation plans for OTHER models/agents to execute.

fossasia/eventyay-interpretation

Write, modify, or review a requirement file under docs/requirements -- pick the single owning file, keep the text contract-only, name IDs so they need no explanation, and verify cross-references and…

rizsotto/Bear

Run mutant, read mutation reports, fix alive mutations, and verify coverage.

mbj/mutant

Build and maintain a Karpathy-style LLM knowledge base — a self-compiling Obsidian markdown wiki where an Agent ingests raw sources, compiles cross-linked concept/entity/summary pages, answers…

lewislulu/llm-wiki-skill

Comprehensive QA and testing skill for quality assurance, test automation, and testing strategies for ReactJS, NextJS, NodeJS applications.

nicepkg/auto-company

Adds integration or unit tests to an OpenROAD module: writes the Tcl test, generates golden files and registers it in both CMake and Bazel.

The-OpenROAD-Project/OpenROAD

Go testing patterns including table-driven tests, subtests, benchmarks, fuzzing, and test coverage.

antoniopaya22/go-rest-template

Statically pairs source files with test files to list code that no test references, using Roslyn for C# or tree-sitter for many languages, with no build.

dotnet/skills

AppRun architecture guidance for building, reviewing, or fixing AppRun applications and the AppRun library itself.

yysun/apprun

Run a live-instance verification of traceway-cli that goes beyond the Go smoke suite — exercises real-data detail endpoints, TTY-default rendering, adaptive metric-name discovery, and emits a…

tracewayapp/traceway

Find and safely apply per-operator refactoring / redundancy-reduction opportunities in a CV-CUDA operator (near-duplicate Tensor/VarShape kernels, reinvented shared utilities, dead code).

CVCUDA/CV-CUDA

Review an Envoy Gateway pull request for essential API, implementation, status, and test coverage requirements.

envoyproxy/gateway

Reviews a change set using a code knowledge graph for risk scores, blast radius and test gaps, and ends with a merge recommendation.

tirth8205/code-review-graph

Maven build expertise for this multi-module Java project. An agent skill from skjolber/3d-bin-container-packing.

skjolber/3d-bin-container-packing

Analyze code coverage and CRAP (Change Risk Anti-Patterns) scores to identify high-risk code.

ardalis/RiverBooks

Enforce Sentry Dart/Flutter SDK test conventions for naming, structure, and fixtures.

getsentry/sentry-dart

Write tests, add test coverage, unit test, or add missing tests for Bitwarden iOS.

bitwarden/ios

Project-wide code coverage and CRAP (Change Risk Anti-Patterns) score analysis for .NET projects.

microsoft/testfx

Writes Vitest tests following project patterns: tests/ directories, vi.mock() for module mocking with vi.hoisted() for test-time factories, global LLM mock from src/test/setup.ts, environment…

caliber-ai-org/ai-setup

Discover reusable implementations and tests before architecture design, substantial changes, or test work.

Ai-Eastern/reuse-before-build

Use xcsift for all Swift and Xcode build commands. An agent skill from ldomaradzki/xcsift.

ldomaradzki/xcsift

Project workflow for invoking the local review sub-agents Thomas, Helen, Beck, Jonas, The Reaper, and Heckler during LibreQoS coding sessions.

LibreQoE/LibreQoS

Audit, plan, write, and verify unit tests for Python projects using pytest.

areed1192/finance-news-aggregator

Write correct and complete RSpec tests for Doorkeeper. An agent skill from doorkeeper-gem/doorkeeper.

doorkeeper-gem/doorkeeper

Analyzes code diffs and files to identify bugs, security vulnerabilities (SQL injection, XSS, insecure deserialization), code smells, N+1 queries, naming issues, and architectural concerns, then…

Yikai-Liao/symusic

A skill your agent uses when reviewing PRs, code changes, or conducting code audits in obsidian-terminal.

polyipseity/obsidian-terminal

Write Jest integration and unit tests for the Grafana Synthetic Monitoring app using React Testing Library, MSW, and src/test helpers.

grafana/synthetic-monitoring-app

Audit vercel-plugin performance on real-world projects. An agent skill from vercel/vercel-plugin.

vercel/vercel-plugin

Reviews a GitHub pull request for correctness, architecture, security, backward compatibility, and test coverage.

webern/cargo-readme

Raise a PyLops operator's test coverage above a threshold (default 90%) by adding or modifying tests.

PyLops/pylops

Measures test coverage and code quality in a repository with the supercov CLI, and turns what it finds into small, focused tests or fixes.

supercorp-ai/supercov

Review Benchflow or SkillsBench task-run trajectories and integration-test Benchflow code changes.

benchflow-ai/benchflow

Review a CV-CUDA operator end-to-end (support / test / bench / docs coverage).

CVCUDA/CV-CUDA

Set up and run mutation testing with PIT (pitest) on a Gradle project, and read the mutation score.

Amplicode/spring-skills

Measure and grow the line coverage of the s3s crate. An agent skill from s3s-project/s3s.

s3s-project/s3s

Review a Pull Request or diff in the @alfalab/core-components UI library — correctness bugs, public API/breaking changes, accessibility, keyboard/focus/pointer interaction, component states…

core-ds/core-components

Testing conventions for the NGINX Ingress Controller repo: Go table-driven tests, mandatory snapshot regeneration, Helm tests and Python pytest integration tests.

nginx/kubernetes-ingress

A skill your agent uses when reviewing a pull request, a branch, or uncommitted working changes in the XYZ/MAPP repository — whether the user asks to "review this PR", "check my changes before I…

GEOLYTIX/xyz

Track EIP test coverage with the repository checklist system.

ethereum/execution-specs

Helps increment code coverage in this Kotlin Multiplatform project.

alexvanyo/composelife

Automated, project-wide code coverage and CRAP (Change Risk Anti-Patterns) score analysis for .NET projects with existing unit tests.

runceel/ReactiveProperty

A skill your agent uses when you need to add or review fuzz testing for Java APIs with CATS — including contract-driven negative testing, malformed payload validation, boundary input exploration, CI…

jabrena/plinth

A skill your agent uses when measuring or chasing Vitest/v8 code coverage in the Trilium monorepo — "what's below 100%?", "which files need tests?", "what lines of X are uncovered?", "take <area to…

TriliumNext/Trilium