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/execute-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/execute-grasshopper)<a href="https://agentmods.dev/skills/bringfire/rook-release/execute-grasshopper"><img src="https://agentmods.dev/badge/skills/bringfire/rook-release/execute-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/execute-grasshopper"><img src="https://agentmods.dev/badge/skills/bringfire/rook-release/execute-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 | $0.00022 | $0.00891 |
| Opus 5.5 | $0.00009 | $0.00356 |
| Sonnet 5.5 | $0.00004 | $0.00178 |
| Haiku 4.5 | $0.00002 | $0.00089 |
Grade A, and why
execute-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 26d 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 — 83 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Execute Grasshopper Work
Authorization
A direct build or edit request authorizes the bounded mutations needed to produce the requested result. Ask again only when the request is ambiguous, destructive, would change pre-existing content outside the admitted boundary, or would materially expand scope.
Execution owns mutation. It may consume a clear brief, an approved design, or an optional technical plan.
Admit the Live Target
Before mutation:
- Confirm the intended host and document identity.
- Capture a fresh gh_snapshot and take its fresh epoch for the immediate batch.
- Resolve every unfamiliar component identity with
gh_libraryand every required port withgh_batch_component_info. - When a needed admitted tool is hidden, use
rook_tools_search,rook_tools_read, androok_tools_call. - Compare any optional structural baseline with the live document.
- Start an execution-owned ID ledger containing temporary IDs, committed IDs, authorized pre-existing IDs, and operation outcomes.
For Wasp work, apply ../design-grasshopper/references/wasp-admission.md. Failed admission stops before mutation with the missing component or port evidence reported.
If no admitted host, mutation tool, or required live component can be reached, stop without mutation. Preserve useful design or plan artifacts and report the unavailable boundary.
Admit Drift
Refresh volatile component identities and ports when their meaning is unchanged. Omit operations already satisfied by the live graph.
Stop for approval when drift changes semantics, topology, ownership, or preservation obligations. A missing or stale structural baseline is advisory only; re-admit the live state before acting.
Apply Bounded Batches
Use gh_edit for ordered batch mutation. It may return partial_success: earlier operations may commit before a later operation fails.
Route component authoring by capability:
- create ordinary Grasshopper components through
gh_edit; - create modern Python or C# script components through
gh_create_script(or its language-specific alias); and - create Chirp components through
chirp_create; and - correct existing script source or pins through
gh_update_scriptandgh_set_script_pins.
What ships with it
1 file 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.
- 26d ago Changed · +9 lines 14fb8d40181a
- 1mo ago First seen · 74 lines · 22 tokens per session scan A d834ee53b02e
execute-grasshopper is a skill published in the GitHub repository bringfire/rook-release (6 stars, last pushed yesterday), licensed MIT. It adds 22 tokens to every session and 891 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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