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gha-matrix-build

Generate GitHub Actions workflow matrices for cross-platform and multi-version testing.

1|Updated Jun 17, 2026
Search Tags:#test automation#github actions#node.js#cross-platform testing#ci cd#workflow yaml#matrix build
One-click install
npx skills add https://github.com/Tcuzzo/HydraAgent_public --skill gha-matrix-build-tcuzzo
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: gha-matrix-build
Source: https://github.com/Tcuzzo/HydraAgent_public/tree/main/hydra/schemes/bundles/ci-cd/skills/gha-matrix-build
Command: npx skills add https://github.com/Tcuzzo/HydraAgent_public --skill gha-matrix-build-tcuzzo

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? Manually writing GitHub Actions matrix configurations for testing across operating systems, runtime versions, and configuration combinations is error-prone and time-consuming, often leading to missed combinations or invalid YAML. ## Core Features & Use Cases - Matrix Design: Define test dimensions (OS, Node/Python versions), exclude incompatible combinations, and add include entries for special cases. - Workflow Generation: Produce valid workflow YAML with fail-fast behavior, dependency caching, and per-matrix artifact collection. - Optimization & Monitoring: Configure concurrent job execution, timeouts, retry logic for flaky tests, status badges, and failure notifications. - Use Case: A team maintaining a Node.js library needs to verify it works on Ubuntu, Windows, and macOS across Node 18, 20, and 22. This Skill generates the complete matrix workflow with caching and failure reporting. ## Quick Start Ask the AI to create a GitHub Actions matrix workflow that tests your project across Ubuntu, Windows, and macOS with Node versions 18, 20, and 22.

Frequently Asked Questions about gha-matrix-build

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I set up a GitHub Actions matrix for multiple Node versions?▼

Define a matrix strategy in your workflow YAML listing node versions and operating systems, then reference them with ${{ matrix.node }} and ${{ matrix.os }} in the job configuration. The skill generates this structure with caching and fail-fast settings included.

How to exclude specific combinations in a GitHub Actions matrix?▼

Add an exclude block under the matrix definition listing the exact key-value pairs to skip, such as a specific OS and Python version pairing. You can also use include entries to add special-case combinations with extra variables like experimental flags.

Does GitHub Actions matrix testing work across Windows, macOS, and Linux?▼

Yes, GitHub Actions supports ubuntu-latest, windows-latest, and macos-latest runners in a single matrix. Each combination runs as a parallel job, and you can configure fail-fast to control whether one failure cancels the rest.

Why do matrix builds take so long and how to speed them up?▼

Matrix jobs multiply total compute time since each combination runs separately. Speed them up by enabling dependency caching, running jobs concurrently, setting per-job timeouts, and adding retry logic only for flaky tests rather than rerunning everything.

What are the limitations of large GitHub Actions matrices?▼

Very large matrices increase queue time and can hit GitHub's job concurrency limits on your plan. Reduce combinations by excluding low-value pairings, splitting stages with dependencies, and reserving full matrices for release branches.

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