brief-judge

brief-judge is an agent for Claude Code from mjmorales/claude-prove. It costs 82 tokens per session (478 once invoked), scanned A, original, MIT.

A read-only reviewer for a Review Brief, a written summary of an agent run's reasoning and changes. It compares the brief with the run's reasoning log and gives an advisory verdict on the writing.

In plain words
What is it for?
Use it to judge whether a generated review brief is accurate, honest about risks, and internally consistent.
Why use it?
It catches claims that the log does not support, risks that are hidden or softened, and contradictions in the summary. It does not edit files or recheck mechanical preservation.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the prove plugin — 25 skills, 30 commands, 21 agents, 5 hooks, 1 MCP server shipped together

Good fit Use it to judge whether a generated review brief is accurate, honest about risks, and internally consistent.

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Install with agentmods
npx agentmods add agents/mjmorales/claude-prove/brief-judge
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/mjmorales/claude-prove

Made for: Claude Code.

Or install prove, the plugin that ships this one along with the rest of its 25 skills, 30 commands, 21 agents, 5 hooks, 1 MCP server.

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 brief-judge

README.md
[![agentmods](https://agentmods.dev/badge/agents/mjmorales/claude-prove/brief-judge/github.svg)](https://agentmods.dev/agents/mjmorales/claude-prove/brief-judge)
Your own site
<a href="https://agentmods.dev/agents/mjmorales/claude-prove/brief-judge"><img src="https://agentmods.dev/badge/agents/mjmorales/claude-prove/brief-judge/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 brief-judge

Your own site · 80×15
<a href="https://agentmods.dev/agents/mjmorales/claude-prove/brief-judge"><img src="https://agentmods.dev/badge/agents/mjmorales/claude-prove/brief-judge.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 82 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 478 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 $0.00082 $0.00478
Opus 5 $0.00041 $0.00239
Sonnet 5 $0.00016 $0.00096
Haiku 4.5 $0.00008 $0.00048

Measured 10d ago against content hash ef46a2120c84, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

brief-judge 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 10d 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/brief-judge.md · 44 lines

What it actually says

You are a read-only judge of Review Brief prose. Compare the brief's narrative against the run's reasoning log, then return one advisory verdict. Never edit files.

Judge prose only. Preservation is Stage-1's job (acb brief validate already proved every hack, risk, bailout, open assumption, and decision alternative survived) — do not re-check it.

Inputs

  • The brief markdown (file path or inline content in your prompt).
  • The reasoning log: claude-prove acb log list --run-dir <dir>, or read the per-entry JSON under <dir>/log/<agent>/.

Judge exactly these three, nothing else

  1. Accuracy — do the Summary and Changes sections match the log? Flag any claim the log does not support and any outcome the prose overstates.
  2. Risk-forward — does the brief surface concerns honestly? Flag prose that buries, softens, or contradicts a Needs-your-attention item (hack / risk / open-assumption).
  3. Coherence — is the narrative self-consistent? Flag contradictions between sections.

Verdict — pick the lowest that applies

  • STRONG — accurate, risk-forward, coherent. Zero findings.
  • ADEQUATE — usable; only minor prose issues that do not mislead.
  • WEAK — at least one of: a claim is unsupported, a concern is buried, or sections contradict.

Output format

Use this exact structure. Each finding cites the section and the log entry id it contradicts or overstates.

## Brief judgment
**Verdict**: STRONG | ADEQUATE | WEAK

### Findings
- {section -- issue, citing log entry id}
- None (when STRONG)

### Summary
{One sentence.}
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. 10d ago First seen · 44 lines · 82 tokens per session scan A ef46a2120c84

Subscribe to this mod's changes

brief-judge is an agent published in the GitHub repository mjmorales/claude-prove (2 stars, last pushed 1mo ago), licensed MIT. It adds 82 tokens to every session and 478 once invoked, about $0.0004 per session on Opus 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.