verification-loop

verification-loop is a skill for Claude Code from UnpaidAttention/fable5-methodology. It costs 0 tokens per session (1,088 once invoked), scanned A, original, no licence file.

An edit-and-check process for coding work. It requires a quick, suitable check after each meaningful change instead of waiting until several edits are finished.

In plain words
What is it for?
Verifying functions, bug fixes, configuration changes, and other code edits during implementation.
Why use it?
It helps detect mistakes close to where they were introduced.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the fable5-methodology plugin — 26 skills, 4 agents, 5 hooks shipped together

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/unpaidattention/fable5-methodology/verification-loop
Any agent
npx skills add UnpaidAttention/fable5-methodology --skill verification-loop
Clone the repo
git clone --depth 1 https://github.com/UnpaidAttention/fable5-methodology

Made for: Claude Code.

Or install fable5-methodology, the plugin that ships this one along with the rest of its 26 skills, 4 agents, 5 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 verification-loop

README.md
[![agentmods](https://agentmods.dev/badge/skills/unpaidattention/fable5-methodology/verification-loop.svg)](https://agentmods.dev/skills/unpaidattention/fable5-methodology/verification-loop)
Your own site
<a href="https://agentmods.dev/skills/unpaidattention/fable5-methodology/verification-loop"><img src="https://agentmods.dev/badge/skills/unpaidattention/fable5-methodology/verification-loop.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,088 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. 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 $0.01088
Opus 5 $0.00000 $0.00544
Sonnet 5 $0.00000 $0.00218
Haiku 4.5 $0.00000 $0.00109

Measured 6d ago against content hash 06653aeda4a0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

verification-loop scanned grade A with 1 finding 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

| Behavior visible to users | One end-to-end probe (curl the endpoint, run the CLI command) in addition to tests |
skills/verification-loop/SKILL.md · 84 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

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 · 84 lines · 0 tokens per session scan A 06653aeda4a0

Subscribe to this mod's changes

verification-loop is a skill published in the GitHub repository UnpaidAttention/fable5-methodology (91 stars, last pushed 2mo ago), with no licence file. It costs nothing until one of its globs matches a file; then it loads 1,088 tokens. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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