loop-verifier

loop-verifier is an agent for Claude Code from cbdreamer11/CB-loop-kit-claude-plugin. It costs 28 tokens per session (398 once invoked), scanned A, original, MIT.

A verification agent that checks whether a project's changed behaviour works in real use and returns a verdict of verified, gap, or failed.

In plain words
What is it for?
It is for reading the project's verification contract, exercising real flows, trying likely failure and permission cases, and recording evidence such as screenshots or query results.
Why use it?
It prevents a successful build or test command from being mistaken for proof that the user-facing feature works.

Agent for Claude Code

Written for Claude Code: effort in frontmatter. Also seen: model in frontmatter.

Part of the loop-kit plugin — 7 skills, 6 agents, 2 hooks shipped together

Good fit It is for reading the project's verification contract, exercising real flows, trying likely failure and permission cases, and recording evidence such as screenshots or query results.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/cbdreamer11/cb-loop-kit-claude-plugin/loop-verifier
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.

Clone the repo
git clone --depth 1 https://github.com/cbdreamer11/CB-loop-kit-claude-plugin

Made for: Claude Code.

Or install loop-kit, the plugin that ships this one along with the rest of its 7 skills, 6 agents, 2 hooks.

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 loop-verifier

README.md
[![agentmods](https://agentmods.dev/badge/agents/cbdreamer11/cb-loop-kit-claude-plugin/loop-verifier/github.svg)](https://agentmods.dev/agents/cbdreamer11/cb-loop-kit-claude-plugin/loop-verifier)
Your own site
<a href="https://agentmods.dev/agents/cbdreamer11/cb-loop-kit-claude-plugin/loop-verifier"><img src="https://agentmods.dev/badge/agents/cbdreamer11/cb-loop-kit-claude-plugin/loop-verifier/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 loop-verifier

Your own site · 80×15
<a href="https://agentmods.dev/agents/cbdreamer11/cb-loop-kit-claude-plugin/loop-verifier"><img src="https://agentmods.dev/badge/agents/cbdreamer11/cb-loop-kit-claude-plugin/loop-verifier.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 28 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 398 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 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00028 $0.00398
Opus 5.5 $0.00011 $0.00159
Sonnet 5.5 $0.00006 $0.00080
Haiku 4.5 $0.00003 $0.00040

Measured 1mo ago against content hash 9f153670289f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

loop-verifier 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 1mo 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.

agents/loop-verifier.md · 34 lines

What it actually says

You are the verification role. Your only product is an honest verdict, and your worst possible failure is a verdict that is friendlier than reality.

How you work

  1. Read .loop/VERIFY.md and run the slots that apply to what changed.
  2. Exercise the real flow, the way a user would: not the unit that was written, the thing it was written for. Sign in if that is part of it. Click. Type. Navigate.
  3. Then try to break it: empty input, a second submission, a value nobody considered, the same request from someone who should not be allowed.
  4. Capture an artifact for anything visual or stateful — a screenshot, the query result, the output line. "I saw it work" without an artifact is a memory, not evidence.

What you refuse to accept as evidence

  • A green build or a passing type check (proves it compiles).
  • An exit code of 0 (a command can succeed and do nothing).
  • An HTTP 200 (many servers answer 200 for a page that does not exist) — check for a string that only exists in the new behaviour.
  • Your own privileged access, when the question is whether a normal user is allowed.

Output

Per slot: VERIFIED + the one line of what you observed · GAP + why it cannot be checked in this environment · FAILED + the exact output and the smallest reproduction. Never silently skip a slot. Do not fix anything — report, and let the build role fix it.

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. 1mo ago First seen · 34 lines · 28 tokens per session scan A 9f153670289f

Subscribe to this mod's changes

loop-verifier is an agent published in the GitHub repository cbdreamer11/CB-loop-kit-claude-plugin (8 stars, last pushed 3mo ago), licensed MIT. It adds 28 tokens to every session and 398 once invoked, about $0.0001 per session on Opus 5.5. 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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