agentic-verify

agentic-verify is a skill for Claude Code from iradoweck/antigravity-awesome-skills. It costs 39 tokens per session (2,136 once invoked), scanned A, a copy of agentic-verify, MIT.

A checker for whether tests catch mistakes in changed Python code. It creates small altered versions of the changed lines, called mutants, and checks whether the tests fail for them.

In plain words
What is it for?
Use it after a Python feature or fix to verify the change, strengthen its pytest tests, and check uncommitted work or a whole branch.
Why use it?
Passing tests alone may not prove that a change is covered. This tool provides evidence by showing which mistakes the tests detect and can add tests for missed cases.

Skill for Claude Code

Written for Claude Code: argument-hint in frontmatter. Also seen: mentions subagents.

Part of the agentic-awesome-skills plugin — 255 skills shipped together

Good fit Use it after a Python feature or fix to verify the change, strengthen its pytest tests, and check uncommitted work or a whole branch.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/iradoweck/antigravity-awesome-skills/agentic-verify
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.

Any agent
npx skills add iradoweck/antigravity-awesome-skills --skill agentic-verify
Clone the repo
git clone --depth 1 https://github.com/iradoweck/antigravity-awesome-skills

Made for: Claude Code.

Or install agentic-awesome-skills, the plugin that ships this one along with the rest of its 255 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.

agentmods badge for agentic-verify

README.md
[![agentmods](https://agentmods.dev/badge/skills/iradoweck/antigravity-awesome-skills/agentic-verify/github.svg)](https://agentmods.dev/skills/iradoweck/antigravity-awesome-skills/agentic-verify)
Your own site
<a href="https://agentmods.dev/skills/iradoweck/antigravity-awesome-skills/agentic-verify"><img src="https://agentmods.dev/badge/skills/iradoweck/antigravity-awesome-skills/agentic-verify/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.

agentmods 80×15 button for agentic-verify

Your own site · 80×15
<a href="https://agentmods.dev/skills/iradoweck/antigravity-awesome-skills/agentic-verify"><img src="https://agentmods.dev/badge/skills/iradoweck/antigravity-awesome-skills/agentic-verify.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 39 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,136 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 100% copy Near-identical to another mod 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00039 $0.02136
Opus 5.5 $0.00016 $0.00854
Sonnet 5.5 $0.00008 $0.00427
Haiku 4.5 $0.00004 $0.00214

Measured 5d ago against content hash 6c37c3558e7e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

agentic-verify 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 5d 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.

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.

Origin

This is a copy

100% identical to agentic-verify — 4 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

plugins/agentic-awesome-skills-claude/skills/agentic-verify/SKILL.md · 154 lines

How it starts

The opening of the file, as written. The whole thing — 154 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Verify a change

Overview

This skill checks that code Claude wrote or changed is actually tested. It defines the check before coding, runs every mutant of the changed lines with a pinned runner, and writes tests until the tests catch them. It reports which mutants were killed and which new tests fail on the old code, so the user can trust the change from evidence. Upstream source: timini/agentic-verification.

When to Use This Skill

  • Use after implementing a feature or fix in a Python/pytest project, before saying the work is done.
  • Use when the user asks whether a change is tested.
  • Use @agentic-test-audit instead to review a whole test suite rather than one change.

How It Works

Arguments: $ARGUMENTS. --base is the git revision to compare with: HEAD (default) checks uncommitted work, a branch such as main checks a whole branch. Other options go to the runner.

The goal is that the user can trust the change from evidence, without reading every line. A change is verified when the tests fail if any part of it is wrong. Passing tests alone do not show that: our study found 71% of the calls that could be deleted unnoticed sat in functions that looked well tested.

Runner

AV='uvx --from git+https://github.com/timini/agentic-verification@07608b3b9e4e359bc0b93b3eca94bb78d67e369e#subdirectory=runner agentic-verification'
$AV verify <project-root> --base <rev> [--budget-minutes N]
$AV replay --run <run-dir> --mutant <id> --all
$AV base-check <project-root> --base <rev> [tests...]

Pass the project root (the directory pytest runs in), not a package directory or a file. base-check runs tests against the production source as it was at --base, in a disposable copy, and lists the tests that pass now and fail there: those detect the change.

The runner works in a disposable copy and writes only to .test-suite-audit/ in the project. It needs Python 3.12+ and pytest-cov in the project's environment, plus pytest-randomly for the order check. Use a Bash timeout of the budget plus 2 minutes. The last stdout line is JSON with the verdict and report paths.

Read the full file on GitHub · 154 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.

  1. 5d ago First seen · 154 lines · 39 tokens per session scan A 6c37c3558e7e

Subscribe to this mod's changes

agentic-verify is a skill published in the GitHub repository iradoweck/antigravity-awesome-skills (30 stars, last pushed 5d ago), licensed MIT. It adds 39 tokens to every session and 2,136 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to agentic-verify, differing in 4 lines, and is treated as a copy.