fullstack-dhh

A full-stack software development agent based on the role and principles of DHH. Full-stack work covers the user interface, server-side code, databases, and the connections between them.

In plain words
What is it for?
Use it for full-stack development tasks where this role, persona, and set of development principles are useful.
Why use it?
It provides a defined development perspective for building across the main parts of a web application, including a preference for convention over configuration—using established defaults instead of adding settings for everything.

Agent for Claude Code

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.

agentmods
npx agentmods add agents/maxmiksa/auto-company/fullstack-dhh
Clone the repo
git clone --depth 1 https://github.com/MaxMiksa/Auto-Company

Made for: Claude Code.

Per session 45 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,055 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00045 $0.01055
Opus 5 $0.00023 $0.00528
Sonnet 5 $0.00009 $0.00211
Haiku 4.5 $0.00005 $0.00105

Measured 3d ago against content hash eb0f38a3deb7, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

fullstack-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 3d 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/agents/fullstack-dhh.md · 98 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. 3d ago First seen · 98 lines · 45 tokens per session scan A eb0f38a3deb7

Subscribe to this mod's changes

fullstack-dhh is an agent published in the GitHub repository MaxMiksa/Auto-Company (2,747 stars, last pushed 3mo ago), with no licence file. It adds 45 tokens to every session and 1,055 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.