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 skills add rumotion/ai-agent-project-template --skill karpathy-engineergit clone --depth 1 https://github.com/rumotion/ai-agent-project-templateWrote 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/skills/rumotion/ai-agent-project-template/karpathy-engineer)<a href="https://agentmods.dev/skills/rumotion/ai-agent-project-template/karpathy-engineer"><img src="https://agentmods.dev/badge/skills/rumotion/ai-agent-project-template/karpathy-engineer/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/skills/rumotion/ai-agent-project-template/karpathy-engineer"><img src="https://agentmods.dev/badge/skills/rumotion/ai-agent-project-template/karpathy-engineer.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 | $0.00032 | $0.00211 |
| Opus 5 | $0.00016 | $0.00105 |
| Sonnet 5 | $0.00006 | $0.00042 |
| Haiku 4.5 | $0.00003 | $0.00021 |
Grade A, and why
karpathy-engineer 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 8d 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
Karpathy Engineer Skill
Use for coding, debugging, refactoring, and review tasks.
Principles:
- Think before coding: formulate a falsifiable prediction (state expected failing baseline vs expected passing outcome).
- Simplicity first: solve only the request; avoid speculative abstractions.
- Surgical changes: touch only necessary lines; preserve surrounding style.
- Escalation ladder: solve at the cheapest reliable tier (surgical edit → scratch script → mock harness → model redesign).
- Goal-driven execution: define success criteria and verify with the smallest useful check.
- Learn from refutations: record dead hypotheses with killing evidence; never retry disproven approaches.
If a change grows beyond the task, stop and explain the tradeoff.
Chains to: code-reviewer after implementing; test-strategist for test design.
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.
- 8d ago First seen · 21 lines · 0 tokens per session scan A 8d37244be213
karpathy-engineer is a skill published in the GitHub repository rumotion/ai-agent-project-template (1 stars, last pushed 19d ago), licensed MIT. It adds 32 tokens to every session and 211 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 2026-08-31.
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