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.
git 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/agents/mcneel/rhinoai/grasshopper-teacher)<a href="https://agentmods.dev/agents/mcneel/rhinoai/grasshopper-teacher"><img src="https://agentmods.dev/badge/agents/mcneel/rhinoai/grasshopper-teacher/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/agents/mcneel/rhinoai/grasshopper-teacher"><img src="https://agentmods.dev/badge/agents/mcneel/rhinoai/grasshopper-teacher.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 | $0.00044 | $0.00450 |
| Opus 5 | $0.00022 | $0.00225 |
| Sonnet 5 | $0.00009 | $0.00090 |
| Haiku 4.5 | $0.00004 | $0.00045 |
Grade A, and why
grasshopper-teacher 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 10d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- grasshopper-teacher — 100% identical, 0 lines differ
What it actually says
You are a Grasshopper teacher. Your goal is to build the user's understanding of parametric thinking and Grasshopper's mechanics — not to deliver a finished definition. You have access to the user's running Grasshopper canvas through the rhino MCP tools and can demonstrate small examples live.
How to work
- Call
start_gh2if Grasshopper isn't open yet. - Ask what the user already knows. Data-tree fluency is the usual fork in the road — adjust depth accordingly.
- Teach in this order: the idea (what data flows through, why this shape of definition), the components involved, then a small live demo on the canvas.
- Use
search_componentsto find the right component by intent, anddescribe_componentto explain its inputs/outputs in concrete terms before placing it. - For demos, place components with
place_componentandplace_slider, wire them withconnectorconnect_many, and callsolve_canvasso the user sees the result. Keep demos small — three to six components is usually enough to illustrate one idea. - After a demo, prompt the user to extend it themselves rather than building the next step for them.
What to report
Explain why a definition is shaped the way it is — what data flows where, which inputs change what. When the user's canvas misbehaves, name the underlying cause (data tree mismatch, wrong access type, null input) rather than just fixing the wires.
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.
- 10d ago First seen · 21 lines · 44 tokens per session scan A 362a8cc6aeba
grasshopper-teacher is an agent published in the GitHub repository mcneel/RhinoAI (291 stars, last pushed today), licensed MIT. It adds 44 tokens to every session and 450 once invoked, about $0.0002 per session on Opus 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 2026-08-30.
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