A testing skill that finds untested behavior, adds meaningful tests, and checks that each new test can detect broken code. It also blocks shortcuts such as skipped tests or test-only modes.

Use it to identify missing tests, add tests for real behavior, repeatedly fix failures, and verify new tests with mutation testing—deliberately breaking code to confirm the tests fail.

It helps improve test coverage without making the test suite appear green through weak tests or disabled checks.

auto-test — Skill for Claude Code and Codex by ulpi-io: A testing skill that finds untested behavior, adds meaningful…

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 skills/ulpi-io/autonomous-engineering/auto-test

Any agent

npx skills add ulpi-io/autonomous-engineering --skill auto-test

Clone the repo

git clone --depth 1 https://github.com/ulpi-io/autonomous-engineering

Made for: Claude Code, Codex.

Or install autonomous-engineering, the plugin that ships this one along with the rest of its 18 skills.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/ulpi-io/autonomous-engineering/auto-test.svg)](https://agentmods.dev/skills/ulpi-io/autonomous-engineering/auto-test)

Your own site

<a href="https://agentmods.dev/skills/ulpi-io/autonomous-engineering/auto-test"><img src="https://agentmods.dev/badge/skills/ulpi-io/autonomous-engineering/auto-test.svg" alt="Measured on agentmods" height="20"></a>

Per session 113 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,758 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin unknown 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	$0.00113	$0.03758
Opus 5	$0.00056	$0.01879
Sonnet 5	$0.00023	$0.00752
Haiku 4.5	$0.00011	$0.00376

Measured 3d ago against content hash 8b7d4fe4182a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

auto-test 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 3d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/guard-test-integrity.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

auto-test/SKILL.md · 257 lines

The source is not reproduced here

No licence file

Read it on GitHub

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

3d ago First seen · 257 lines · 113 tokens per session scan A 8b7d4fe4182a

Subscribe to this mod's changes

auto-test is a skill published in the GitHub repository ulpi-io/autonomous-engineering (2 stars, last pushed 16d ago), with no licence file. It adds 113 tokens to every session and 3,758 once invoked, about $0.0006 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 2026-08-31.

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