NVIDIA/skills is a catalogue of portable instruction sets that teach coding agents how to use NVIDIA software for robotics, simulation, CUDA, retrieval-augmented generation, and related workflows. Developers install these skills in agents such as Claude Code or Codex, while the catalogue mirrors skills maintained in separate NVIDIA product repositories.
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 NVIDIA/skills --skill ethos-writegit clone --depth 1 https://github.com/NVIDIA/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/nvidia/skills/ethos-write)<a href="https://agentmods.dev/skills/nvidia/skills/ethos-write"><img src="https://agentmods.dev/badge/skills/nvidia/skills/ethos-write/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/nvidia/skills/ethos-write"><img src="https://agentmods.dev/badge/skills/nvidia/skills/ethos-write.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 | $0.00089 | $0.03391 |
| Opus 5.5 | $0.00036 | $0.01356 |
| Sonnet 5.5 | $0.00018 | $0.00678 |
| Haiku 4.5 | $0.00009 | $0.00339 |
Grade A, and why
ethos-write 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 22d 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 — 268 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Write an agent's ethos.md
Turn the answers from ethos-explore into a durable artifact. The ethos.md is
the contract that people and agents read before they build, evaluate, review,
or change this agent. Without it, each of them has to re-ask everything, and
nothing records what the agent is supposed to do.
Creating or reviewing an ethos.md does not authorize application changes or imply
that changes will follow. Do not ask for permission to modify prompts, models,
tools, validation code, or workflow structure, or generate sections listing those
permissions. Any workflow that later changes the application
collects the permissions it needs when that work is undertaken. Keep behavioral
constraints and safety boundaries, including approvals the agent needs for its
own actions, in Behavior and Constraints. Also retain already-confirmed
organizational safety and review policies and their known owners; recording
such a restriction does not grant permission to make a change.
The ethos.md records the intended state of the agent, which is not the same as the implemented state. The codebase already shows what the agent does. This file is the only place that records what it is supposed to do, what it must never do, and how to weigh a win on one metric against a loss on another.
Location
The ethos.md is a local file in the agent's repository, committed alongside
the code it describes. Use the path the user names. Otherwise reuse an
existing ethos.md, including an ETHOS.md written by Eval Author 0.1.0. Otherwise write
ethos.md at the repository root; in a repository with several agents, put it
at the root of the agent's own package and confirm that path with the user.
The file is the only copy. There is no remote canonical copy to sync.
Schema version
Write schema_version: 1. Every canonical body section is required. The
validator rejects a file missing any of those headings. When you have nothing
to say, write _(none)_ rather than dropping the section.
Version 1 is the only schema version. When a new version ships, its migration
steps belong in this skill.
What ships with it
9 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.
- 22d ago First seen · 268 lines · 89 tokens per session scan A 649100c80d8b
ethos-write is a skill published in the GitHub repository NVIDIA/skills (3,873 stars, last pushed yesterday), licensed Apache-2.0. It adds 89 tokens to every session and 3,391 once invoked, about $0.0004 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 2026-10-16.
ethos-write compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| ethos-writeNVIDIA/skills | Skill | 3.9k | yesterday | Apache-2.0 | A | 89 | Claude Code |
| implementation-task-specmakifbaysal/tasktrooper | Skill | 120 | 16d ago | Apache-2.0 | A | 29 | Claude Code, Codex |
| screen-mockup-htmlmakifbaysal/tasktrooper | Skill | 120 | 16d ago | Apache-2.0 | A | 63 | Claude Code, Codex |
| responsive-layoutmakifbaysal/tasktrooper | Skill | 120 | 16d ago | Apache-2.0 | A | 35 | Claude Code, Codex |
| security-diff-review-methodmakifbaysal/tasktrooper | Skill | 120 | 16d ago | Apache-2.0 | A | 44 | Claude Code, Codex |
| ci-cd-pipeline-authoringmakifbaysal/tasktrooper | Skill | 120 | 16d ago | Apache-2.0 | A | 56 | Claude Code, Codex |
| stepwise-task-executionmakifbaysal/tasktrooper | Skill | 120 | 16d ago | Apache-2.0 | A | 33 | Claude Code, Codex |