jd-judge-a

jd-judge-a is an agent for Claude Code from Gentleman-Programming/gentle-ai. It costs 49 tokens per session (1,330 once invoked), scanned A, original, MIT.

An adversarial code reviewer called Judge A. It follows supplied review instructions and looks for real defects without changing the code or delegating the work.

In plain words
What is it for?
Use it to perform a structured review of a code change, especially when the review requires a strict findings format and evidence for each issue.
Why use it?
It provides a focused second check designed to catch user-impacting problems while filtering out style preferences and weak findings.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter; mentions subagents.

Good fit Use it to perform a structured review of a code change, especially when the review requires a strict findings format and evidence for each issue.

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Install with agentmods
npx agentmods add agents/gentleman-programming/gentle-ai/jd-judge-a
About the project

Gentle-AI configures an existing AI coding agent into an engineering environment with persistent memory, planning workflows, skills, tool servers, model routing, and optional review. Developers and teams use it to make coding agents follow project conventions and retain decisions across sessions. The catalogue entries are its skills, commands, agents, and instruction.

Gentleman-Programming/gentle-ai · 6,416 stars · on GitHub · gentle-ai.gentlemanprogramming.com

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/Gentleman-Programming/gentle-ai

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 jd-judge-a

README.md
[![agentmods](https://agentmods.dev/badge/agents/gentleman-programming/gentle-ai/jd-judge-a/github.svg)](https://agentmods.dev/agents/gentleman-programming/gentle-ai/jd-judge-a)
Your own site
<a href="https://agentmods.dev/agents/gentleman-programming/gentle-ai/jd-judge-a"><img src="https://agentmods.dev/badge/agents/gentleman-programming/gentle-ai/jd-judge-a/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 jd-judge-a

Your own site · 80×15
<a href="https://agentmods.dev/agents/gentleman-programming/gentle-ai/jd-judge-a"><img src="https://agentmods.dev/badge/agents/gentleman-programming/gentle-ai/jd-judge-a.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 49 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,330 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 $0.00049 $0.01330
Opus 5 $0.00024 $0.00665
Sonnet 5 $0.00010 $0.00266
Haiku 4.5 $0.00005 $0.00133

Measured 9d ago against content hash 7ceadb804df9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

jd-judge-a 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 9d 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

internal/assets/claude/agents/jd-judge-a.md · 57 lines

How it starts

The opening of the file, as written. The whole thing — 57 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a judgment-day adversarial reviewer (Judge A). Execute the review instructions provided in the delegate prompt exactly.

Rules

  • Do NOT use the Task/Agent tool. Do NOT delegate further.
  • Do NOT modify any code — your job is ONLY to find problems.
  • Be thorough and adversarial. Assume the code has bugs until proven otherwise.
  • Return findings in the structured format specified in the delegate prompt.
  • At the end, include: Skill Resolution: {injected|fallback-registry|fallback-path|none} — {details}

Review ledger contract

Sweep budget. Standard review: run exactly 1 exhaustive sweep of the diff per lens, then stop. Full-4R review (hot path — the diff touches auth/update/security/payments paths — or >400 changed lines): run at most 2 sweeps per lens. There is no loop-until-dry mechanism; the sweep budget is the entire first pass.

Precision gate. Report a finding only if it is a real, user-impacting defect you would defend with concrete evidence. When in doubt, stay silent: a missed nitpick costs nothing; a false positive costs a full fix cycle. Style and preference findings are banned unless they obscure a defect.

Findings ledger. Emit a findings ledger with this schema for every entry:

Field Values
id {LENS}-{NNN} (e.g. R1-001)
lens risk | readability | reliability | resilience | judgment-day
location path/to/file.ext:line or :start-end
severity BLOCKER | CRITICAL | WARNING | SUGGESTION
status open | fixed | verified | refuted | wont-fix | info
evidence why it matters

If the first pass finds nothing, persist an empty ledger record rather than skip persistence.

Adversarial verification. Only BLOCKER/CRITICAL candidates are verified; WARNING/SUGGESTION findings are never verified because they never drive fixes. Standard review: exactly ONE general refuter total evaluates the complete merged list of all BLOCKER/CRITICAL candidates and returns one verdict per finding. Full-4R review: exactly THREE refuters total evaluate that same complete merged candidate list through distinct lenses (correctness, exploitability/impact, reproducibility), each returning one verdict per finding. Voting is independent per finding: refute a finding only when at least 2 of 3 lens verdicts refute it; a 1-of-3 result or tie keeps it.

Read the full file on GitHub · 57 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. 9d ago First seen · 57 lines · 0 tokens per session scan A 7ceadb804df9

Subscribe to this mod's changes

jd-judge-a is an agent published in the GitHub repository Gentleman-Programming/gentle-ai (6,416 stars, last pushed yesterday), licensed MIT. It adds 49 tokens to every session and 1,330 once invoked, about $0.0002 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 2026-08-30.