Gumroad Prod Console
antiwork/gumroad
Execute read-only Ruby/Rails commands against Gumroad's production database for debugging and investigation.
Review Ruby/Rails code like DHH would - direct, opinionated, allergic to over-engineering.
Install Dhh
$ npx skills add marckohlbrugge/37signals-skills --skill dhh -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install marckohlbrugge/37signals-skills dhh --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/marckohlbrugge/37signals-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/dhh .claude/skills/dhh && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "dhh" agent skill from https://github.com/marckohlbrugge/37signals-skills/tree/main/skills/dhh into .claude/skills/dhh/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "dhh", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/marckohlbrugge/37signals-skills/tree/main/skills/dhhType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add marckohlbrugge/37signals-skills --skill dhh -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install marckohlbrugge/37signals-skills dhh --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/marckohlbrugge/37signals-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/dhh .agents/skills/dhh && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "dhh" agent skill from https://github.com/marckohlbrugge/37signals-skills/tree/main/skills/dhh into .agents/skills/dhh/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "dhh", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add marckohlbrugge/37signals-skills --skill dhh -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install marckohlbrugge/37signals-skills dhh --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/marckohlbrugge/37signals-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/dhh .cursor/skills/dhh && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "dhh" agent skill from https://github.com/marckohlbrugge/37signals-skills/tree/main/skills/dhh into .cursor/skills/dhh/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "dhh", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/marckohlbrugge/37signals-skills.git --path skills/dhh--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add marckohlbrugge/37signals-skills --skill dhh -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install marckohlbrugge/37signals-skills dhh --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/marckohlbrugge/37signals-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/dhh .gemini/skills/dhh && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "dhh" agent skill from https://github.com/marckohlbrugge/37signals-skills/tree/main/skills/dhh into .gemini/skills/dhh/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "dhh", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install marckohlbrugge/37signals-skills dhhInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add marckohlbrugge/37signals-skills --skill dhh -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/marckohlbrugge/37signals-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/dhh .github/skills/dhh && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "dhh" agent skill from https://github.com/marckohlbrugge/37signals-skills/tree/main/skills/dhh into .github/skills/dhh/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "dhh", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add marckohlbrugge/37signals-skills --skill dhh -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install marckohlbrugge/37signals-skills dhh --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/marckohlbrugge/37signals-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/dhh .opencode/skills/dhh && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "dhh" agent skill from https://github.com/marckohlbrugge/37signals-skills/tree/main/skills/dhh into .opencode/skills/dhh/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "dhh", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
dhh- GitHub stars
- 724
- Token cost
- ~2.2k tokens
- SKILL.md length
- 1,217 words
- Files
- 1
- Skills in repo
- 8
- Repo updated
- First seen
- Licence
- None found
At a glance
Review Ruby/Rails code like DHH would - direct, opinionated, allergic to over-engineering.
- Works in 5 steps: Read the code (or run git diff if no… → Flag anything that violates the patterns… → Lead with the most important issues —… → …
- The user runs /dhh
- SKILL.md covers How to Review, Voice, Core Philosophy and Style Preferences, plus 3 more sections
- Calls git
What it does
Dhh is an agent skill from marckohlbrugge/37signals-skills. Review Ruby/Rails code like DHH would - direct, opinionated, allergic to over-engineering. Use when the user runs /dhh or asks for a DHH-style review of a diff, file, or recent changes.
Its SKILL.md is about 2.2k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Development, covering Backend development and Code simplification. It works with Ruby. The repository describes itself as: Unofficial agent skills + reference guide that teach AI coding assistants to write Rails the 37signals way — extracted from Fizzy, Campfire, and DHH's code reviews.
When your agent uses it
- The user runs /dhh
- Asks for a DHH-style review of a diff
Example prompts
- “/dhh”
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Read the code (or run git diff if no scope was specified; fall back to git show HEAD if there's no diff).
- Flag anything that violates the patterns below.
- Lead with the most important issues — don't bury the lede.
- Give concrete fixes with file:line references. Whenever possible, write the exact replacement code, even a one-liner.
- Praise sparingly and briefly when something is genuinely well done.
What it can do on your machine
Read from SKILL.md and the folder at commit c58e7d5. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
git
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use git, which can reach the network depending on how they are called.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Dhh loads about 2.2k tokens when it runs. Until then it costs about 47 tokens; SKILL.md has 1,217 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 1,217 words (~2,193 tokens).
“Review code the way DHH actually reviews PRs (voice and patterns calibrated against ~200 of his real review comments on basecamp/fizzy). Direct and opinionated, but conversational — a colleague who's seen it all, not a drill sergeant.”
- name
- dhh
- disable-model-invocation
- true
Files
Just SKILL.md in skills/dhh of marckohlbrugge/37signals-skills.
Open the folder on GitHubat commit c58e7d5
Compare with similar skills
Dhh next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Dhh this skillmarckohlbrugge/37signals-skills | 724 | — | ~2.2k | Automated safety check: Pass | None | |
| Gumroad Prod Consoleantiwork/gumroad | 9.8k | — | ~2.9k | Automated safety check: Notes | MIT | |
| Ruby Prodavila7/claude-code-templates | 33k | 8 repos | ~445 | Automated safety check: Pass | MIT | |
| Dhh Rails Styledavekilleen/Dex | 494 | 1 repos | ~1.7k | Automated safety check: Pass | MIT | |
| Rubyericrisco/rsc-harness | 180 | — | ~3.2k | Automated safety check: Pass | MIT | |
| Dhh Ruby StyleMicrock/ordinary-claude-skills | 404 | — | ~1.4k | Automated safety check: Pass | Custom licence |
Similar skills
Ruby Pro
davila7/claude-code-templates
Write idiomatic Ruby code with metaprogramming, Rails patterns, and performance optimization.
Dhh Rails Style
davekilleen/Dex
This skill should be used when writing Ruby and Rails code in DHH's distinctive 37signals style.
Ruby
ericrisco/rsc-harness
A skill your agent uses when writing or refactoring plain Ruby outside Rails — scripts, CLIs, gems, libraries: Enumerable chains and blocks, module mixins and value objects, Bundler/gemspec…
Dhh Ruby Style
Microck/ordinary-claude-skills
Write Ruby and Rails code in DHH's distinctive 37signals style.
Antipattern Prevention
doorkeeper-gem/doorkeeper
Avoid common Ruby and Rails antipatterns that degrade maintainability and performance.
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Related
Works with
Categories
Questions about Dhh
What does Dhh do?
Review Ruby/Rails code like DHH would - direct, opinionated, allergic to over-engineering. Dhh is an agent skill from marckohlbrugge/37signals-skills. Review Ruby/Rails code like DHH would - direct, opinionated, allergic to over-engineering.
When should I use Dhh?
Dhh fits situations like: the user runs /dhh; asks for a DHH-style review of a diff.
How do I install Dhh in Claude Code?
Run `npx skills add marckohlbrugge/37signals-skills --skill dhh -a claude-code`. Or copy the skill folder (skills/dhh in marckohlbrugge/37signals-skills) into .claude/skills/dhh in your project. Claude Code loads it when a task matches its description.
How do I install Dhh in Codex?
Run `npx skills add marckohlbrugge/37signals-skills --skill dhh -a codex`. Or copy the skill folder (skills/dhh in marckohlbrugge/37signals-skills) into .agents/skills/dhh in your project. Codex loads it when a task matches its description.
Can I use Dhh in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add marckohlbrugge/37signals-skills --skill dhh -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/dhh, .gemini/skills/dhh, .github/skills/dhh and .opencode/skills/dhh in your project.
What does Dhh need to run?
Going by SKILL.md and its folder, Dhh needs the command-line tools its instructions call (git).
Does Dhh access the network?
SKILL.md contains no URLs. Its commands use git, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Dhh safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Dhh use?
No licence was found for Dhh or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Dhh use?
About 2.2k tokens (SKILL.md is roughly 8.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Dhh?
Skills that share tags, products or a category with Dhh: Gumroad Prod Console (antiwork/gumroad, 9.8k stars), Ruby Pro (davila7/claude-code-templates, 33k stars), Dhh Rails Style (davekilleen/Dex, 494 stars) and Ruby (ericrisco/rsc-harness, 180 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Dhh?
marckohlbrugge (a GitHub user) maintains it in marckohlbrugge/37signals-skills, which has 724 GitHub stars. The repository holds 8 skills in this directory. The repository was last updated on June 9, 2026.
Source: marckohlbrugge/37signals-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.