What is trueskill-rank?

A ranking tool that compares a collection of text items using TrueSkill, a rating method originally designed to rank players, with an AI judge applying a chosen rubric.

Rank, score, curate, or sort text such as drafts, ideas, search results, or other written collections using a changeable set of criteria.

It provides a repeatable way to sort many written items by quality instead of judging the whole list in one pass. Overlapping comparisons help build the ranking from smaller groups.

trueskill-rank — Skill for Claude Code and Codex by buildoak

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 buildoak/fieldwork-skills --skill trueskill-rank

Clone the repo

git clone --depth 1 https://github.com/buildoak/fieldwork-skills

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/buildoak/fieldwork-skills/trueskill-rank/github.svg)](https://agentmods.dev/skills/buildoak/fieldwork-skills/trueskill-rank)

Your own site

<a href="https://agentmods.dev/skills/buildoak/fieldwork-skills/trueskill-rank"><img src="https://agentmods.dev/badge/skills/buildoak/fieldwork-skills/trueskill-rank/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/buildoak/fieldwork-skills/trueskill-rank"><img src="https://agentmods.dev/badge/skills/buildoak/fieldwork-skills/trueskill-rank.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 61 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,197 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. 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.

Model	Per session	Once invoked
Fable 5.1	$0.00061	$0.02197
Opus 5.5	$0.00024	$0.00879
Sonnet 5.5	$0.00012	$0.00439
Haiku 4.5	$0.00006	$0.00220

Measured 1mo ago against content hash f46a9e6d005c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

trueskill-rank 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 1mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/trueskill-rank.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Fallback: If `agent-mux` not found, falls back to direct OpenAI API via `urllib.request` (stdlib, zero deps). Requires `OPENAI_API_KEY` env var. Uses `gpt-4o-mini`. Results written as `{"success": true, "response": "..."

skills/trueskill-rank/SKILL.md · 221 lines

How it starts

The opening of the file, as written. The whole thing — 221 lines — stays where its author put it; the contents beside it link to each section on GitHub.

TrueSkill Rank

Rank any collection of text items by quality using TrueSkill + LLM-as-judge.

Setup

pip install trueskill

Python 3.11+ required
agent-mux for parallel dispatch (optional -- falls back to direct OpenAI API if OPENAI_API_KEY is set)
Claude Code: copy this skill folder into .claude/skills/trueskill-rank/
Codex CLI: append this SKILL.md content to your project's root AGENTS.md

For the full installation walkthrough (prerequisites, verification, API fallback), see references/installation-guide.md.

Staying Updated

This skill ships with an UPDATES.md changelog and UPDATE-GUIDE.md for your AI agent.

After installing, tell your agent: "Check UPDATES.md in the trueskill-rank skill for any new features or changes."

When updating, tell your agent: "Read UPDATE-GUIDE.md and apply the latest changes from UPDATES.md."

Follow UPDATE-GUIDE.md so customized local files are diffed before any overwrite.

Quick Start

PYTHON="python3"
CLI="~/.claude/skills/trueskill-rank/scripts/trueskill-rank.py"

# Full pipeline: prepare + dispatch + aggregate
$PYTHON $CLI run \
  --input items.json \
  --overlap 3 \
  --rubric ~/.claude/skills/trueskill-rank/rubrics/practitioner-signal.md \
  --output results.json

# Or step by step:
$PYTHON $CLI prepare --input items.json --overlap 3 \
  --rubric ~/.claude/skills/trueskill-rank/rubrics/practitioner-signal.md \
  --output-dir /tmp/ts-run/
# Dispatch is handled internally by trueskill-rank.py (no separate script needed)
$PYTHON $CLI aggregate --run-dir /tmp/ts-run/ --output results.json

Cost: each subset of 10 items produces C(10,2)=45 implicit pairwise comparisons. 100 items at overlap 3 = 30 subsets = 30 API calls = 1,350 implicit comparisons.

Decision Tree

Mode Selection

Question	Answer	Mode
Ranking individual items (messages, posts)?	Yes	`--mode batch` (default)
Comparing entities (channels, sources, candidates)?	Yes	`--mode pairwise`
Items > 50?	Yes	`--mode batch` (far more efficient)
Items < 20, need binary signal?	Yes	`--mode pairwise`

Read the full file on GitHub · 221 lines

Files

What ships with it

9 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.

1mo ago First seen · 221 lines · 61 tokens per session scan A f46a9e6d005c

Subscribe to this mod's changes

trueskill-rank is a skill published in the GitHub repository buildoak/fieldwork-skills (15 stars, last pushed 7mo ago), licensed Apache-2.0. It adds 61 tokens to every session and 2,197 once invoked, about $0.0002 per session on Opus 5.5. 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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