Borrowing it
Nothing to install: this file belongs to EYamanS/chisel. 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/EYamanS/chisel/main/AGENTS.mdgit clone --depth 1 https://github.com/EYamanS/chiselWrote 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/eyamans/chisel/agents-md)<a href="https://agentmods.dev/instructions/eyamans/chisel/agents-md"><img src="https://agentmods.dev/badge/instructions/eyamans/chisel/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/eyamans/chisel/agents-md"><img src="https://agentmods.dev/badge/instructions/eyamans/chisel/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 | $0.00399 | $0.00399 |
| Opus 5.5 | $0.00160 | $0.00160 |
| Sonnet 5.5 | $0.00080 | $0.00080 |
| Haiku 4.5 | $0.00040 | $0.00040 |
Grade A, and why
chisel 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 2mo 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
Chisel — contributor guide
Chisel is an MCP server (plus an optional Next.js web playground) that lets AI agents build, edit, render, and export 3D models from primitives and boolean CSG.
Where things live
src/lib/scene/— the scene graph (types.ts), the deterministic op reducer (operations.ts), and the shared modeling tool schemas (tools.ts).src/lib/three/build.ts— turns the scene graph into Three.js meshes, evaluating CSG booleans withthree-bvh-csg. Pure CPU; no GPU needed.src/lib/render/— the headless software rasterizer (raster.ts), glTF/OBJ export (export.ts), a zero-dependency PNG encoder (png.ts), and a bitmap label font.src/mcp/— the MCP server (server.ts) and its in-memory session store (engine.ts).src/lib/agent/,src/components/,src/app/— the browser playground (WebGL viewport- OpenAI-driven agent loop).
Conventions
- Geometry is Y-up, right-handed. Rotations are stored in degrees.
- The renderer and exporters must stay headless (no
window, no WebGL) — they run in Node for the MCP server. - The same
src/lib/scene/tools.tsschemas feed both the MCP server and the web agent; keep them in sync.
Commands
npm run mcp— run the MCP server from source (tsx).npm run build:mcp— bundle the standalone binary todist/server.js.npm run dev— web playground at http://localhost:3000.npx tsc --noEmit— typecheck the whole project.
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.
- 2mo ago First seen · 32 lines · 399 tokens per session scan A 8286b7d8d71c
chisel AGENTS.md is an instructions file published in the GitHub repository EYamanS/chisel (7 stars, last pushed 4mo ago), licensed MIT. It adds 399 tokens to every session, about $0.0016 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.
chisel AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| chisel AGENTS.mdEYamanS/chisel | Instructions file | 7 | 4mo ago | MIT | A | 399 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,649 | GitHub Copilot |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,093 | GitHub Copilot |
| vscode ai-customization.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 1,907 | GitHub Copilot |