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-preflight.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-preflight)<a href="https://agentmods.dev/commands/nimbus-agent/nimbus/nimbus-preflight"><img src="https://agentmods.dev/badge/commands/nimbus-agent/nimbus/nimbus-preflight/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-preflight"><img src="https://agentmods.dev/badge/commands/nimbus-agent/nimbus/nimbus-preflight.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 | $0.00121 | $0.04113 |
| Opus 5.5 | $0.00048 | $0.01645 |
| Sonnet 5.5 | $0.00024 | $0.00823 |
| Haiku 4.5 | $0.00012 | $0.00411 |
Grade A, and why
nimbus-preflight 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.
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.
- 8d ago Changed · +1 lines 86fb1d5e4434
- 9d ago Changed · +6 lines 44721bf91f5c
- 10d ago Changed 8be5bfe4c951
- 14d ago Changed f14a2d70028e
- 22d ago Changed · +3 lines 4adfe307890e
- 23d ago Changed 5caf27c8160c
- 26d ago Changed · +14 lines 28e11a31eb8a
- 1mo ago Changed af0cbfe7d1d7
- 1mo ago Changed · +13 lines 98d29137dcec
- 1mo ago First seen · 106 lines · 121 tokens per session scan A c7e6f435fee8
nimbus-preflight is a command published in the GitHub repository nimbus-agent/Nimbus (7 stars, last pushed yesterday), licensed AGPL-3.0. It adds 121 tokens to every session and 4,113 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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