Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/armanzeroeight/fastagent-pluginsnpx agentmods add skills/armanzeroeight/fastagent-plugins/matrix-optimizerWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/armanzeroeight/fastagent-plugins/matrix-optimizer)<a href="https://agentmods.dev/skills/armanzeroeight/fastagent-plugins/matrix-optimizer"><img src="https://agentmods.dev/badge/skills/armanzeroeight/fastagent-plugins/matrix-optimizer/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/armanzeroeight/fastagent-plugins/matrix-optimizer"><img src="https://agentmods.dev/badge/skills/armanzeroeight/fastagent-plugins/matrix-optimizer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00060 | $0.02539 |
| Opus 5 | $0.00030 | $0.01269 |
| Sonnet 5 | $0.00012 | $0.00508 |
| Haiku 4.5 | $0.00006 | $0.00254 |
Grade B, and why
matrix-optimizer scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
install-cmd: sudo apt-get install How it starts
The opening of the file, as written. The whole thing — 423 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Matrix Optimizer
Configure and optimize GitHub Actions matrix strategies for efficient multi-version and multi-platform testing.
Quick Start
Basic matrix for testing multiple Node.js versions:
strategy:
matrix:
node-version: [16, 18, 20]
Instructions
Step 1: Identify Matrix Dimensions
Common matrix dimensions:
- Language versions: Node.js, Python, Ruby, Go versions
- Operating systems: ubuntu, macos, windows
- Architectures: x64, arm64
- Dependency versions: Database versions, framework versions
- Feature flags: Different configuration options
Example dimensions:
strategy:
matrix:
os: [ubuntu-latest, macos-latest, windows-latest]
node-version: [16, 18, 20]
# This creates 9 jobs (3 OS × 3 versions)
Step 2: Configure Matrix Strategy
Basic matrix:
jobs:
test:
runs-on: ${{ matrix.os }}
strategy:
matrix:
os: [ubuntu-latest, macos-latest]
node-version: [18, 20]
steps:
- uses: actions/checkout@v3
- uses: actions/setup-node@v3
with:
node-version: ${{ matrix.node-version }}
- run: npm test
Matrix with include:
strategy:
matrix:
os: [ubuntu-latest, macos-latest]
node-version: [18, 20]
include:
# Add specific combination
- os: windows-latest
node-version: 20
# Add extra variables for specific combination
- os: ubuntu-latest
node-version: 20
experimental: true
Matrix with exclude:
strategy:
matrix:
os: [ubuntu-latest, macos-latest, windows-latest]
node-version: [16, 18, 20]
exclude:
# Skip Node 16 on Windows
- os: windows-latest
node-version: 16
# Skip Node 16 on macOS
- os: macos-latest
node-version: 16
Step 3: Optimize for Cost and Speed
Fail-fast strategy:
strategy:
fail-fast: false # Continue all jobs even if one fails
matrix:
node-version: [16, 18, 20]
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 6d ago First seen · 423 lines · 60 tokens per session scan B a6dfb6dd9db8
matrix-optimizer is a skill published in the GitHub repository armanzeroeight/fastagent-plugins (29 stars, last pushed 1mo ago), licensed MIT. It adds 60 tokens to every session and 2,539 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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