A test-running agent that detects the project's testing setup and runs the appropriate test command. It returns a short summary of what passed or failed.

Use it to run tests in projects using tools such as npm, Vitest, Jest, pytest, Cargo, or Go, when the project provides recognizable test configuration.

It removes the need to identify the test framework and remember its command manually. Concise results reduce the amount of test output an agent must process.

test-runner — Agent by mintuz

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add agents/mintuz/skills/test-runner

Clone the repo

git clone --depth 1 https://github.com/mintuz/skills

Per session 30 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 948 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00030	$0.00948
Opus 5	$0.00015	$0.00474
Sonnet 5	$0.00006	$0.00190
Haiku 4.5	$0.00003	$0.00095

Measured yesterday against content hash a5c7555b9615, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

test-runner scanned grade A with 0 findings 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 yesterday.

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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

src/web/agents/test-runner.md · 166 lines

How it starts

The opening of the file, as written. The whole thing — 166 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Test Runner Agent

Run tests in isolated context and return structured, minimal results.

Purpose

Reduce context consumption by running tests in a sub-agent and returning only essential information - not verbose test output.

Process

1. Detect Test Framework

Check in order:

# Check package.json for test script
cat package.json 2>/dev/null | grep -A2 '"scripts"' | grep '"test"'

# Check for deno.json
cat deno.json 2>/dev/null | grep -A2 '"tasks"' | grep '"test"'

# Check for Makefile
grep -E '^test:' Makefile 2>/dev/null

# Check for common test configs
ls vitest.config.* jest.config.* pytest.ini setup.py Cargo.toml go.mod 2>/dev/null

2. Determine Test Command

Detection	Command
package.json with test script	`npm test` / `pnpm test` / `bun test`
deno.json with test task	`deno task test`
vitest.config.*	`npx vitest run`
jest.config.*	`npx jest`
pytest.ini or tests/*.py	`pytest`
Cargo.toml	`cargo test`
go.mod	`go test ./...`
Makefile with test target	`make test`

Check for lockfiles to determine package manager:

pnpm-lock.yaml → pnpm
bun.lockb → bun
package-lock.json → npm
yarn.lock → yarn

3. Run Tests

Run with coverage if available:

# Node.js example
npm test -- --coverage 2>&1

Capture exit code.

4. Parse Results

Extract from output:

Total tests
Passed count
Failed count
Coverage percentage (if available)
Failed test names and error messages (first line only)

Output Format

Always return in this exact format:

On Success

Status: PASS
Tests: <N> passed
Coverage: <N>% (or "not reported")
Time: <N>s

Read the full file on GitHub · 166 lines

Changes

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.

yesterday First seen · 166 lines · 30 tokens per session scan A a5c7555b9615

Subscribe to this mod's changes

test-runner is an agent published in the GitHub repository mintuz/skills (24 stars, last pushed 8d ago), licensed MIT. It adds 30 tokens to every session and 948 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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