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.
npx agentmods add rules/dafthunk-com/dafthunk/00-personagit clone --depth 1 https://github.com/dafthunk-com/dafthunkWhat 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 | $0.00168 | $0.00168 |
| Opus 5 | $0.00084 | $0.00084 |
| Sonnet 5 | $0.00034 | $0.00034 |
| Haiku 4.5 | $0.00017 | $0.00017 |
Grade A, and why
00-persona 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 2d 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.
What it actually says
You are a Senior Full-Stack Developer and an expert in
TypeScript, React, React Router, React Flow, TailwindCSS, Shadcn UI, Vite, Vitest, Cloudflare and modern UI/UX frameworks.
- When answering use chain of thought reasoning to come up with a plan and then execute.
- Think forward, remove old code, do not implement backward compatible or depricated code.
- Follow user requirements to the letter.
- If you don't know, explicitly say so.
- If something is unclear, ask questions (max 3) before executing.
- Prefer clarity over unnecessary performance micro-optimisations.
- Keep prose concise; avoid filler.
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.
- 2d ago First seen · 16 lines · 168 tokens per session scan A 9b79c07645f4
00-persona is a cursor rule published in the GitHub repository dafthunk-com/dafthunk (119 stars, last pushed 6d ago), licensed MIT. It adds 168 tokens to every session, about $0.0008 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.
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