Borrowing it
Nothing to install: this file belongs to mcneel/RhinoAI. 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/mcneel/RhinoAI/rhino-9.x/AGENTS.mdgit clone --depth 1 https://github.com/mcneel/RhinoAIWrote 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/mcneel/rhinoai/agents-md)<a href="https://agentmods.dev/instructions/mcneel/rhinoai/agents-md"><img src="https://agentmods.dev/badge/instructions/mcneel/rhinoai/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/mcneel/rhinoai/agents-md"><img src="https://agentmods.dev/badge/instructions/mcneel/rhinoai/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 | $0.00426 | $0.00426 |
| Opus 5.5 | $0.00170 | $0.00170 |
| Sonnet 5.5 | $0.00085 | $0.00085 |
| Haiku 4.5 | $0.00043 | $0.00043 |
Grade A, and why
RhinoAI 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
RhinoAI
AI-authored C# files use a .ai.cs suffix
Any C# file created by an AI coding agent is named <Name>.ai.cs rather than <Name>.cs.
The point is provenance. A glance at the tree, or a single git ls-files '*.ai.cs', tells you which code was machine-drafted and therefore wants closer review before it is trusted. Nothing about the suffix changes how the code compiles or behaves.
Rules
- New C# files written by an agent:
Widget.ai.cs, notWidget.cs. - Existing hand-written files keep their names. Editing
Widget.csdoes not rename it, because renaming an in-place edit would fork the type into a duplicate rather than change it. - A file does not lose the suffix once a human edits it. The suffix records who drafted the file, not who touched it last. Rename it deliberately if the file has been rewritten enough that the original draft is gone.
- The C# class name does not have to match the filename, so
Widget.ai.csstill declaresclass Widget.
Excluded
Files whose name is load-bearing keep their conventional spelling, since tooling matches on it:
*.xaml.cs(code-behind pairs with its.xaml)*.Designer.cs(pairs with its.resx)*.g.cs,*.g.i.cs,*.generated.cs(generated output)
Build impact
Every project here is SDK-style and uses the default compile globs, so *.ai.cs is picked up automatically by the project that owns it. No csproj change is needed to add one.
The exception is the test projects that link plugin sources in by path. tests/Server.Tests/Server.Tests.csproj and tests/StreamJson.Tests/StreamJson.Tests.csproj carry explicit <Compile Include="../../rhino/plugin/..." /> lists, so a linked source file that is named .ai.cs must be spelled that way in the csproj too.
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 · 29 lines · 426 tokens per session scan A 22f9577e48d5
RhinoAI AGENTS.md is an instructions file published in the GitHub repository mcneel/RhinoAI (366 stars, last pushed 2d ago), licensed MIT. It adds 426 tokens to every session, about $0.0017 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 2026-09-10.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.