A strict review guide for investigating two recurring problems in a game repository: unexplained travel deaths and apparently unreachable mana nodes.

It helps examine why a character died during travel, especially when no player-versus-player combat was involved, and why a mana node cannot be reached.

It challenges assumptions such as calling a death bad luck or a node unreachable, and asks for evidence of an unnamed defect instead.

How tpeppers/m59-harness configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to tpeppers/m59-harness. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/tpeppers/m59-harness/main/.claude/skills/m59-critic/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/tpeppers/m59-harness

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/tpeppers/m59-harness/m59-critic/github.svg)](https://agentmods.dev/skills/tpeppers/m59-harness/m59-critic)

Your own site

<a href="https://agentmods.dev/skills/tpeppers/m59-harness/m59-critic"><img src="https://agentmods.dev/badge/skills/tpeppers/m59-harness/m59-critic/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/tpeppers/m59-harness/m59-critic"><img src="https://agentmods.dev/badge/skills/tpeppers/m59-harness/m59-critic.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 135 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,821 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 unknown 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	$0.00135	$0.03821
Opus 5.5	$0.00054	$0.01528
Sonnet 5.5	$0.00027	$0.00764
Haiku 4.5	$0.00014	$0.00382

Measured 1mo ago against content hash 73e21a98a43b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

m59-critic 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 1mo 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.

.claude/skills/m59-critic/SKILL.md · 264 lines

The source is not reproduced here

No licence file

Read it on GitHub

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 · 264 lines · 135 tokens per session scan A 73e21a98a43b

Subscribe to this mod's changes

m59-critic is a skill published in the GitHub repository tpeppers/m59-harness (2 stars, last pushed today), with no licence file. It adds 135 tokens to every session and 3,821 once invoked, about $0.0005 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 2026-09-11.

Debugging Game development

m59-critic next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
m59-critictpeppers/m59-harness	Skill	2	today	none	A	135	Claude Code
minecraft-debug-mcpmoeru-ai/airi	Skill	51k	yesterday	MIT	A	68	Codex
cli-anything-nsight-graphicsHKUDS/CLI-Anything	Skill	58k	1mo ago	Apache-2.0	A	29	Claude Code, Codex
performance-optimizationgamedev-skills/awesome-gamedev-agent-skills	Skill	6.9k	10d ago	Apache-2.0	A	121	Claude Code
unity-consoleBesty0728/Unity-Skills	Skill	1.9k	yesterday	MIT	A	10	Claude Code, Codex
diagnosing-bgs-problemshashgraph-online/awesome-codex-plugins	Skill	1.5k	yesterday	Apache-2.0	A	72	Claude Code, Codex
axiom-audit-spritekitCharlesWiltgen/Axiom	Skill	1.3k	yesterday	MIT	A	39	Codex

m59-harness: Skill for Claude Code