Borrowing it
Nothing to install: this file belongs to caezium/nib. 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/caezium/nib/main/AGENTS.mdgit clone --depth 1 https://github.com/caezium/nibWrote 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/instructions/caezium/nib/agents-md)<a href="https://agentmods.dev/instructions/caezium/nib/agents-md"><img src="https://agentmods.dev/badge/instructions/caezium/nib/agents-md/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/instructions/caezium/nib/agents-md"><img src="https://agentmods.dev/badge/instructions/caezium/nib/agents-md.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 | $0.00171 | $0.00171 |
| Opus 5.5 | $0.00068 | $0.00068 |
| Sonnet 5.5 | $0.00034 | $0.00034 |
| Haiku 4.5 | $0.00017 | $0.00017 |
Grade A, and why
nib AGENTS.md 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 1mo 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
Read the framework docs before writing code
This app's desktop framework ships its own API docs, and they're more current than any model's training data — its APIs get renamed and reorganized, so code written from memory won't compile.
Before writing or modifying framework code, read the documentation under
node_modules/@mobrowser/api/docs/:
node_modules/@mobrowser/api/docs/guides/— architecture, project structure, the multi-process model, IPC, the native module, features, and examples.node_modules/@mobrowser/api/docs/api/— the API reference with code examples.
Don't guess API names, method signatures, or import paths — look them up in the docs.
If the docs/ directory is missing, run npm run gen to download it.
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.
- 1mo ago First seen · 15 lines · 171 tokens per session scan A 0bb9b3cf4ca5
nib AGENTS.md is an instructions file published in the GitHub repository caezium/nib (9 stars, last pushed 2mo ago), licensed MIT. It adds 171 tokens to every session, about $0.0007 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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