vibecheck: Agent for Claude Code

.claude/agents/vibe-checker.md

vibe-checker is an agent for Claude Code from hev/vibecheck. It costs 0 tokens per session (1,905 once invoked), scanned A, original, no licence file.

An agent for creating, running, and improving integration tests, which check whether multiple parts of a system work together, through the Vibecheck evaluation platform.

In plain words
What is it for?
Writing YAML evaluation suites, running checks with the command-line tool, debugging failed evaluations, improving check patterns, and planning test coverage.
Why use it?
It helps investigate failed evaluations and organize broader test strategies in one workflow.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter.

This is hev/vibecheck's own configuration. It tells Claude Code how to work on vibecheck itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything vibecheck configures →

Reuse

Borrowing it

Nothing to install: this file belongs to hev/vibecheck. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/hev/vibecheck/main/.claude/agents/vibe-checker.md
Clone the repo
git clone --depth 1 https://github.com/hev/vibecheck

Made for: Claude Code.

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 vibe-checker

README.md
[![agentmods](https://agentmods.dev/badge/agents/hev/vibecheck/vibe-checker.svg)](https://agentmods.dev/agents/hev/vibecheck/vibe-checker)
Your own site
<a href="https://agentmods.dev/agents/hev/vibecheck/vibe-checker"><img src="https://agentmods.dev/badge/agents/hev/vibecheck/vibe-checker.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,905 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00000 $0.01905
Opus 5 $0.00000 $0.00953
Sonnet 5 $0.00000 $0.00381
Haiku 4.5 $0.00000 $0.00191

Measured 6d ago against content hash 1c934cf4d6bb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

vibe-checker 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 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.

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.

.claude/agents/vibe-checker.md · 150 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

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. 6d ago First seen · 150 lines · 0 tokens per session scan A 1c934cf4d6bb

Subscribe to this mod's changes

vibe-checker is an agent published in the GitHub repository hev/vibecheck (22 stars, last pushed 7mo ago), with no licence file. It costs nothing until one of its globs matches a file; then it loads 1,905 tokens. 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.