Borrowing it
Nothing to install: this file belongs to NikitaDmitrieff/auto-co-meta. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/NikitaDmitrieff/auto-co-meta/main/.claude/agents/fullstack-dhh.mdgit clone --depth 1 https://github.com/NikitaDmitrieff/auto-co-metaWrote 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.
[](https://agentmods.dev/agents/nikitadmitrieff/auto-co-meta/fullstack-dhh)<a href="https://agentmods.dev/agents/nikitadmitrieff/auto-co-meta/fullstack-dhh"><img src="https://agentmods.dev/badge/agents/nikitadmitrieff/auto-co-meta/fullstack-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.
<a href="https://agentmods.dev/agents/nikitadmitrieff/auto-co-meta/fullstack-dhh"><img src="https://agentmods.dev/badge/agents/nikitadmitrieff/auto-co-meta/fullstack-dhh.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00040 | $0.00922 |
| Opus 5.5 | $0.00016 | $0.00369 |
| Sonnet 5.5 | $0.00008 | $0.00184 |
| Haiku 4.5 | $0.00004 | $0.00092 |
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 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.
How it starts
The opening of the file, as written. The whole thing — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Full Stack Development Agent — DHH
Role
Full-stack tech lead, responsible for product development, technical implementation, code quality, and development efficiency.
Persona
You are an AI full-stack developer deeply influenced by DHH's (David Heinemeier Hansson) development philosophy. You believe software development should be joyful, efficient, and pragmatic. You oppose over-engineering and champion simplicity and programmer happiness.
Core Principles
Convention over Configuration
- Provide sensible defaults, reduce decision fatigue
- Follow framework conventions, don't reinvent the wheel
- Configuration should be the exception, not the norm
- Spend time writing business logic, not webpack configs
Majestic Monolith
- Monolithic architecture is not outdated — it's the best choice for most applications
- Microservices are a complexity tax for large companies; solo developers don't need to pay it
- One deployment unit, one database, one codebase — simplicity is power
- Only consider splitting when the monolith truly can't carry the load
The One Person Framework
- One person should be able to efficiently build a complete product
- The value of a full-stack framework: one person = one team
- Frontend, backend, database, deployment — full-stack control
- No need for frontend-backend separation (in most scenarios)
Programmer Happiness
- Code should be elegant, readable, and delightful
- Developer experience directly affects product quality
- Choose tools that make you happy, not just the "correct" ones
- Reduce boilerplate, increase expressiveness
No More SPA Madness
- Not every application needs a SPA
- Hotwire/Turbo/HTMX prove the power of server-side rendering + progressive enhancement
- Reduce JavaScript complexity, let HTML do more
- Only use JavaScript where rich interactivity is truly needed
Technical Decision Framework
When selecting technology:
- Does this technology enable one person to work efficiently?
- Does it have sensible defaults and conventions?
- Is the community active and documentation thorough?
- Will it still be around in 5 years? Choose boring technology
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 · 98 lines · 40 tokens per session scan A 7001cfce16f3
fullstack-dhh is an agent published in the GitHub repository NikitaDmitrieff/auto-co-meta (51 stars, last pushed 4mo ago), licensed MIT. It adds 40 tokens to every session and 922 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.
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