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 skills/neurofoo/agent-skills/feynmannpx skills add neurofoo/agent-skills --skill feynmangit clone --depth 1 https://github.com/neurofoo/agent-skillsWrote 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/neurofoo/agent-skills/feynman)<a href="https://agentmods.dev/skills/neurofoo/agent-skills/feynman"><img src="https://agentmods.dev/badge/skills/neurofoo/agent-skills/feynman.svg" alt="Measured on agentmods" 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 | $0.00041 | $0.00551 |
| Opus 5 | $0.00020 | $0.00275 |
| Sonnet 5 | $0.00008 | $0.00110 |
| Haiku 4.5 | $0.00004 | $0.00055 |
Grade A, and why
feynman 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 5d 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 — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Feynman Technique
Apply the full Feynman learning technique to deeply understand a concept.
Instructions
Work through all four steps of the Feynman technique. Be honest about gaps—they're the point.
Output Format
Concept: [What are we trying to understand?]
Step 1: Explain It Simply
Explain as if teaching someone with no background in this field
Simple Explanation
[Write a plain-language explanation. Use everyday words. Avoid jargon. Aim for a bright 12-year-old to understand.]
Analogy
[Create an analogy using something familiar to illustrate the concept]
Step 2: Identify Gaps
Where did the explanation get fuzzy, hand-wavy, or require jargon?
Gaps Found
| Gap | What I Said | What I'm Not Sure About |
|---|---|---|
| 1 | [vague part] | [the underlying question] |
| 2 | [vague part] | [the underlying question] |
| 3 | [vague part] | [the underlying question] |
Jargon Used
| Term | Can I Explain It Simply? |
|---|---|
| [term] | Yes / No / Partially |
Step 3: Fill the Gaps
Research or think through each gap
Gap 1: [Topic]
- The question: [What wasn't clear?]
- The answer: [What I learned]
- Now I can explain it as: [Simple version]
Step 4: Refined Explanation
Rewrite the complete explanation with gaps filled and simpler language
Final Simple Explanation
[The improved, complete explanation in plain language]
Improved Analogy
[A refined or new analogy that better captures the concept]
Key Takeaways
- [Core insight 1]
- [Core insight 2]
- [Core insight 3]
Test Question If someone asked me to explain this in 30 seconds, I'd say:
[Elevator pitch version]
Guidelines
- Don't pretend to understand—gaps are valuable
- Use analogies from everyday life
- If you need jargon, define it simply
- Shorter is usually better
- The "explain to a child" bar is high—take it seriously
$ARGUMENTS
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 5d ago First seen · 99 lines · 41 tokens per session scan A ea0e7a0ba3c8
feynman is a skill published in the GitHub repository neurofoo/agent-skills (111 stars, last pushed 7mo ago), licensed MIT. It adds 41 tokens to every session and 551 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.
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