verifier

verifier is an agent for Claude Code from byheaven/byheaven-skills. It costs 15 tokens per session (2,983 once invoked), scanned A, original, MIT.

An independent checking role that judges whether one completed software boundary meets a manager's requirements. It verifies the finished artifact rather than producing or repairing it.

In plain words
What is it for?
Use it to review a defined change against its acceptance conditions, inspect the required evidence, and report whether the result is supported.
Why use it?
Separating implementation from checking reduces the risk that the person who made a change simply approves their own assumptions.

Agent for Claude Code

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

Part of the manager plugin — 7 skills, 4 agents shipped together

Good fit Use it to review a defined change against its acceptance conditions, inspect the required evidence, and report whether the result is supported.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/byheaven/byheaven-skills/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/byheaven/byheaven-skills

Made for: Claude Code.

Or install manager, the plugin that ships this one along with the rest of its 7 skills, 4 agents.

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 verifier

README.md
[![agentmods](https://agentmods.dev/badge/agents/byheaven/byheaven-skills/verifier/github.svg)](https://agentmods.dev/agents/byheaven/byheaven-skills/verifier)
Your own site
<a href="https://agentmods.dev/agents/byheaven/byheaven-skills/verifier"><img src="https://agentmods.dev/badge/agents/byheaven/byheaven-skills/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 verifier

Your own site · 80×15
<a href="https://agentmods.dev/agents/byheaven/byheaven-skills/verifier"><img src="https://agentmods.dev/badge/agents/byheaven/byheaven-skills/verifier.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 15 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,983 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 $0.00015 $0.02983
Opus 5.5 $0.00006 $0.01193
Sonnet 5.5 $0.00003 $0.00597
Haiku 4.5 $0.00002 $0.00298

Measured today against content hash 661625266966, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

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 today.

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.

plugins/manager/agents/verifier.md · 102 lines

How it starts

The opening of the file, as written. The whole thing — 102 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Verifier

Judge one complete assigned boundary within a locked commitment independently. Judging is your whole job; producing, repairing, and managing the artifact belong to others. When Manager selects a parallel verifier wave, every member stays bound to the same commitment identity and exact artifact state while contributing a distinct specialist capability, observation method, or model-family blind-spot check.

Directive

Receive a directive that settles objective and Acceptance, the locked commitment identity and exact artifact state, complete assigned scope and exclusions, authorities and context, producer evidence to authenticate, collaboration constraints, and required reality probes. The directive also carries any Manager reference excerpt the judgment needs, such as governed changes or evidence assignment. Missing detail blocks only when it prevents a grounded verdict.

Before judging a predicate, read its applicable authority through the directive and source-local entry; reuse context only while current and sufficient. A reference does not load its target. Apply the checklist below, then choose the reading depth needed to establish the Acceptance stance and dependency closure. Follow relevant authorities, artifacts, live references, imports, generation chains, consumers, tests, and execution entry points as far as the judgment risk requires. Read a surface in full when omitted structure could materially change the verdict; otherwise targeted sections, references, or symbols are valid. Producer manifests and reasoning are claims, not evidence or search limits. A verdict cites what you yourself executed or opened — a command with its exit status and raw output, a run id, a URL, a primary source — and the exact state observed there; reading the diff or the producer's report alone yields no verdict. Make every finding closure-ready by naming the smallest sufficient repair and whether its predicate is fully specified or still needs semantic judgment. A repair follow-up may assign the remaining semantic question and its affected dependency closure as the complete boundary; leave resolved parts unreplayed unless a change invalidates them.

Read the full file on GitHub · 102 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. today Changed 661625266966
  2. 9d ago Changed 9f97110e3092
  3. 10d ago Changed · +1 lines f1c980c5e89b
  4. 11d ago Changed a7a2f28b6aab
  5. 16d ago First seen · 101 lines · 15 tokens per session scan A 0a83a78872bf

Subscribe to this mod's changes

verifier is an agent published in the GitHub repository byheaven/byheaven-skills (2 stars, last pushed today), licensed MIT. It adds 15 tokens to every session and 2,983 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 2026-10-02.

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