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dhh

dhh is a skill for Claude Code from marckohlbrugge/37signals-skills. It costs 50 tokens per session (2,050 once invoked), scanned A, original, no licence file.

A code-review skill for Ruby and Rails, using the direct and opinionated style associated with DHH, the creator of Ruby on Rails. It is intended to reject unnecessary complexity.

In plain words
What is it for?
Reviewing a diff, file, or recent Ruby on Rails changes when the user asks for a DHH-style review or runs /dhh.
Why use it?
It helps identify over-engineered or needlessly complicated Rails code during review.

Skill for Claude Code

Written for Claude Code: disable-model-invocation in frontmatter.

not rated 731repo +1 5mo ago A scan 50 tokens no licence

Good fit Reviewing a diff, file, or recent Ruby on Rails changes when the user asks for a DHH-style review or runs /dhh.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/marckohlbrugge/37signals-skills/dhh
View source ↗ marckohlbrugge/37signals-skills
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 marckohlbrugge/37signals-skills --skill dhh
Clone the repo
git clone --depth 1 https://github.com/marckohlbrugge/37signals-skills

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 dhh

README.md
[![agentmods](https://agentmods.dev/badge/skills/marckohlbrugge/37signals-skills/dhh/github.svg)](https://agentmods.dev/skills/marckohlbrugge/37signals-skills/dhh)
Your own site
<a href="https://agentmods.dev/skills/marckohlbrugge/37signals-skills/dhh"><img src="https://agentmods.dev/badge/skills/marckohlbrugge/37signals-skills/dhh/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 dhh

Your own site · 80×15
<a href="https://agentmods.dev/skills/marckohlbrugge/37signals-skills/dhh"><img src="https://agentmods.dev/badge/skills/marckohlbrugge/37signals-skills/dhh.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,050 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00050 $0.02050
Opus 5.5 $0.00020 $0.00820
Sonnet 5.5 $0.00010 $0.00410
Haiku 4.5 $0.00005 $0.00205

Measured 2mo ago against content hash 145f02157da7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

dhh 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 2mo 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/dhh/SKILL.md · 103 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

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.

  1. 2mo ago First seen · 103 lines · 50 tokens per session scan A 145f02157da7

Subscribe to this mod's changes

dhh is a skill published in the GitHub repository marckohlbrugge/37signals-skills (731 stars, last pushed 5mo ago), with no licence file. It adds 50 tokens to every session and 2,050 once invoked, about $0.0002 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 2026-08-30.

Code reviewLanguagesRuby
Related

dhh compared with skills from other repositories

dhh next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
dhhmarckohlbrugge/37signals-skillsSkill7315mo agononeA50Claude Code
gem-docs-reviewVSN2015/concerns_on_railsSkill26yesterdayMITA152Claude Code
simplifymaquina-app/rails-claude-codeSkill4821d agoMITA123Claude Code
sgcop-setupSonicGarden/sgcopSkill234d agoMITA169Claude Code
rails-audit-thoughtbotthoughtbot/rails-audit-thoughtbotSkill2637d agoMITB130Claude Code, Codex
gemtrackerspaquet/gemtrackerSkill234d agoMITA49Claude Code, Codex
code-reviewigmarin/rails-agent-skillsSkill291mo agoMITA40Claude Code, Codex