Feynman is an open-source AI research agent that helps users investigate topics with language models. It supports local model providers and hosted model authentication through its setup process. The catalogue contains skills, agents, and instructions that extend Feynman’s workflows.
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/companion-inc/feynman/eli5npx skills add companion-inc/feynman --skill eli5git clone --depth 1 https://github.com/companion-inc/feynmanWrote 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/companion-inc/feynman/eli5)<a href="https://agentmods.dev/skills/companion-inc/feynman/eli5"><img src="https://agentmods.dev/badge/skills/companion-inc/feynman/eli5.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 5.1 | $0.00063 | $0.00254 |
| Opus 5 | $0.00032 | $0.00127 |
| Sonnet 5 | $0.00013 | $0.00051 |
| Haiku 4.5 | $0.00006 | $0.00025 |
Grade A, and why
eli5 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 6d 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
ELI5
Use Feynman's alpha tools first when the user names a specific paper, arXiv id, DOI, or paper URL. In shell, call feynman alpha ..., not a bare global alpha binary.
If the user gives only a topic, identify 1-3 representative papers and anchor the explanation around the clearest or most important one.
Structure the answer with:
One-Sentence SummaryBig IdeaHow It WorksWhy It MattersWhat To Be Skeptical OfIf You Remember 3 Things
Guidelines:
- Use short sentences and concrete words.
- Define jargon immediately or remove it.
- Prefer one good analogy over several weak ones.
- Separate what the paper actually shows from speculation or interpretation.
- Keep the explanation inline unless the user explicitly asks to save it as an artifact.
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.
- 6d ago First seen · 26 lines · 63 tokens per session scan A cb5fcdde93ec
eli5 is a skill published in the GitHub repository companion-inc/feynman (8,870 stars, last pushed 10d ago), licensed MIT. It adds 63 tokens to every session and 254 once invoked, about $0.0003 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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