Borrowing it
Nothing to install: this file belongs to bringfire/rook-release. 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/bringfire/rook-release/main/.claude/skills/design-grasshopper/SKILL.mdgit clone --depth 1 https://github.com/bringfire/rook-releaseWrote 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/skills/bringfire/rook-release/design-grasshopper)<a href="https://agentmods.dev/skills/bringfire/rook-release/design-grasshopper"><img src="https://agentmods.dev/badge/skills/bringfire/rook-release/design-grasshopper/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/skills/bringfire/rook-release/design-grasshopper"><img src="https://agentmods.dev/badge/skills/bringfire/rook-release/design-grasshopper.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 | $0.00029 | $0.00643 |
| Opus 5.5 | $0.00012 | $0.00257 |
| Sonnet 5.5 | $0.00006 | $0.00129 |
| Haiku 4.5 | $0.00003 | $0.00064 |
Grade A, and why
design-grasshopper 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.
How it starts
The opening of the file, as written. The whole thing — 63 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Design a Grasshopper Definition
Purpose
Turn an ambiguous Grasshopper brief into a clear, reviewable design decision. This stage is Rhino, Grasshopper, and knowledge read-only. It may inspect current state and discuss alternatives, but it does not mutate either host or write to the knowledge store. When durability adds value, it may write only the authorized design artifact under docs/plans/.
Use this stage only when material design choices remain unresolved. A clear, bounded build request can proceed directly to execution. Planning is optional and adds value when work is large, destructive, cross-session, preservation-sensitive, or otherwise high risk.
Inspect Current State
Use gh_snapshot to understand the active document and canvas. Use Rhino read tools only when scene context is relevant. Do not infer document identity, component identity, topology, or parameter ports from prose alone.
Knowledge results are optional advisory context. They can suggest terminology, precedents, or risks, but live document and component metadata outrank stored knowledge.
Resolve technical identity with gh_library and gh_batch_component_info. In a lean catalog, reach hidden admitted tools through rook_tools_search, inspect their current schemas with rook_tools_read, and invoke them through rook_tools_call. If live evidence is missing or ambiguous, record the uncertainty instead of guessing.
For Wasp work, follow Wasp admission before treating a design as executable.
The explore checklist is a compact reminder of the evidence to collect.
Clarify the Brief
Ask one material question at a time. Focus on decisions that change the definition, such as:
- intended outcome and acceptance criteria;
- authoritative inputs and expected outputs;
- controlling variables and useful ranges;
- data-flow, data-tree, geometry, and solver constraints;
- existing content that must be preserved; and
- acceptable failure, review, and handoff boundaries.
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 · 63 lines · 29 tokens per session scan A 6301db8b60ee
design-grasshopper is a skill published in the GitHub repository bringfire/rook-release (6 stars, last pushed yesterday), licensed MIT. It adds 29 tokens to every session and 643 once invoked, about $0.0001 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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