reward_judge_fair

reward_judge_fair is a skill for Claude Code, Codex from Qwen-Applications/Skill-RM. It costs 42 tokens per session (609 once invoked), scanned A, original, Apache-2.0.

A judging procedure for comparing candidate answers to a visible user request. It provides general checks for correctness, following instructions, usefulness, safety, and bias, with optional Python checks over the text.

In plain words
What is it for?
Scoring alternative responses, checking them against a rubric, controlling style and position bias, and producing a required JSON verdict.
Why use it?
It gives answer evaluation a consistent basis instead of relying only on personal preference or the order in which answers appear.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Scoring alternative responses, checking them against a rubric, controlling style and position bias, and producing a required JSON verdict.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/qwen-applications/skill-rm/reward_judge_fair
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.

Any agent
npx skills add Qwen-Applications/Skill-RM --skill reward_judge_fair
Clone the repo
git clone --depth 1 https://github.com/Qwen-Applications/Skill-RM

Made for: Claude Code, Codex.

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 reward_judge_fair

README.md
[![agentmods](https://agentmods.dev/badge/skills/qwen-applications/skill-rm/reward_judge_fair/github.svg)](https://agentmods.dev/skills/qwen-applications/skill-rm/reward_judge_fair)
Your own site
<a href="https://agentmods.dev/skills/qwen-applications/skill-rm/reward_judge_fair"><img src="https://agentmods.dev/badge/skills/qwen-applications/skill-rm/reward_judge_fair/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 reward_judge_fair

Your own site · 80×15
<a href="https://agentmods.dev/skills/qwen-applications/skill-rm/reward_judge_fair"><img src="https://agentmods.dev/badge/skills/qwen-applications/skill-rm/reward_judge_fair.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 42 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 609 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 $0.00042 $0.00609
Opus 5 $0.00021 $0.00304
Sonnet 5 $0.00008 $0.00122
Haiku 4.5 $0.00004 $0.00061

Measured 12d ago against content hash f4854ce4ef58, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

reward_judge_fair 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 12d 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.

skills/reward_judge_fair/SKILL.md · 71 lines

How it starts

The opening of the file, as written. The whole thing — 71 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Reward Judge

Use this skill to organize a reward judgment from the current user request and candidate responses. The skill is a controller and resource interface, not a per-sample prompt template.

Inputs

The host message provides only:

  • the visible user prompt or instruction;
  • candidate responses and their current labels;
  • the required final output format.

Use the current prompt and candidate responses as the full task context.

Resource Interface

After this skill is loaded, use only resources listed in the current resource index. The resources are generic:

  • rubric: generic reward judging criteria;
  • principle: generic correctness, instruction-following, safety, usefulness, and anti-style-bias principles;
  • calibration: position, verbosity, style, and confidence-bias controls;
  • aggregation: generic evidence-combination policy;
  • output_contract: JSON verdict contract;
  • tool: python_sandbox, which can inspect only the visible prompt and candidate responses.

Tool Use

Use view_resource to read generic rubric, principles, bias control, aggregation, or output format resources.

Use python_sandbox when deterministic checking over visible text can change the verdict. It runs short Python over only:

  • prompt: the visible user prompt;
  • candidates: the current visible candidate responses keyed by label;
  • sample: {"prompt": prompt, "candidates": candidates}.

Use it for counts, regex/format checks, JSON/list structure, simple arithmetic, supplied examples, small code-behavior checks, or answer extraction from visible candidate text.

run_resource should normally not be used with this skill. Read generic resources with view_resource, use python_sandbox for deterministic visible-text checks, then submit final_answer.

Decision Procedure

  1. Identify the user's actual task and mandatory constraints from the prompt.
  2. Compare candidates under one shared criterion.
  3. Prioritize hard correctness, instruction following, safety, factuality, and required output format.
  4. Use python_sandbox only for checks that can be computed from visible prompt/candidates.
  5. Apply bias controls: do not prefer position, length, markdown polish, confidence, or fluent style unless it improves task success.
  6. Use Tie only when candidates are genuinely equivalent or the visible evidence is insufficient for a reliable preference.
  7. Return the required JSON.

Read the full file on GitHub · 71 lines

Files

What ships with it

6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 12d ago First seen · 71 lines · 42 tokens per session scan A f4854ce4ef58

Subscribe to this mod's changes

reward_judge_fair is a skill published in the GitHub repository Qwen-Applications/Skill-RM (25 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 42 tokens to every session and 609 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.

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