Borrowing it
Nothing to install: this file belongs to nimbus-agent/Nimbus. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/nimbus-agent/Nimbus/main/.claude/commands/nimbus-tool-output-envelope.mdgit clone --depth 1 https://github.com/nimbus-agent/NimbusWrote 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/commands/nimbus-agent/nimbus/nimbus-tool-output-envelope)<a href="https://agentmods.dev/commands/nimbus-agent/nimbus/nimbus-tool-output-envelope"><img src="https://agentmods.dev/badge/commands/nimbus-agent/nimbus/nimbus-tool-output-envelope/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/commands/nimbus-agent/nimbus/nimbus-tool-output-envelope"><img src="https://agentmods.dev/badge/commands/nimbus-agent/nimbus/nimbus-tool-output-envelope.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 | $0.00122 | $0.02418 |
| Opus 5.5 | $0.00049 | $0.00967 |
| Sonnet 5.5 | $0.00024 | $0.00484 |
| Haiku 4.5 | $0.00012 | $0.00242 |
Grade A, and why
nimbus-tool-output-envelope 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 today.
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.
The source is not reproduced here
Licensed AGPL-3.0
The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
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.
- today Changed 3ff3a3e39f80
- 2d ago Changed 40dfe6b1719f
- 5d ago Changed b8c32869399f
- 7d ago Changed 6f3d8a28929e
- 8d ago Changed 15b42939e795
- 9d ago Changed 5b7b3f4f4190
- 13d ago Changed c7ca0e22abf8
- 17d ago Changed · +1 lines d69da4d5514a
- 19d ago Changed fc181e6f0f7c
- 22d ago First seen · 105 lines · 122 tokens per session scan A 92dcea85d9bb
nimbus-tool-output-envelope is a command published in the GitHub repository nimbus-agent/Nimbus (7 stars, last pushed yesterday), licensed AGPL-3.0. It adds 122 tokens to every session and 2,418 once invoked, about $0.0005 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 2026-08-31.
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