OpenPencil is an open-source vector design tool where users describe interfaces in natural language and edit them on a live canvas with AI. Designers and developers use it for UI creation, design iteration, and coordinating multiple AI agents on different parts of a page. The catalogue entries provide instructions for working with OpenPencil.
Borrowing it
Nothing to install: this file belongs to ZSeven-W/openpencil. 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/ZSeven-W/openpencil/main/AGENTS.mdgit clone --depth 1 https://github.com/ZSeven-W/openpencilWrote 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/zseven-w/openpencil/agents-md)<a href="https://agentmods.dev/instructions/zseven-w/openpencil/agents-md"><img src="https://agentmods.dev/badge/instructions/zseven-w/openpencil/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/zseven-w/openpencil/agents-md"><img src="https://agentmods.dev/badge/instructions/zseven-w/openpencil/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 | $0.00539 | $0.00539 |
| Opus 5.5 | $0.00216 | $0.00216 |
| Sonnet 5.5 | $0.00108 | $0.00108 |
| Haiku 4.5 | $0.00054 | $0.00054 |
Grade A, and why
openpencil 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
AGENTS.md
This file provides guidance to Codex when working with code in this repository.
The TypeScript OpenPencil has been retired.
apps/web,apps/desktop,apps/cli, and thepen-*packages are gone. The product is Rust (crates/) + a wasm-backed web SDK (packages/op-web-sdk*). See git history (last TS tagv0.7.5) for the retired code.
For full guidance see CLAUDE.md (this directory). Authoritative Rust architecture lives in crates/CLAUDE.md; remaining packages in packages/CLAUDE.md.
Commands
Tooling is Cargo (Rust — the product). The root has no package.json; the JS/Bun tooling for the web SDK lives under packages/ — run SDK/JS scripts from there.
- Web dev server (Rust):
bash scripts/start-web-rust.sh - Build (Rust):
cargo build --workspace --release - Tests (Rust):
cargo test --workspace; single crate:cargo test -p <crate> - Type check:
cargo check --workspace; wasm:cargo check --target wasm32-unknown-unknown -p op-host-web --no-default-features --features web - Lint / format (Rust):
cargo clippy --workspace --all-targets -- -D warnings/cargo fmt --all - Lint / format (TS SDK): from
packages/:bun run lint(oxlint) /bun run format(oxfmt) - Desktop app:
cargo build -p op-host-desktop→ binaryopenpencil-desktop - CLI:
cargo build -p op-cli→ binaryop - Iconify catalog (Rust assets): from
packages/:bun run generate-iconify-catalog
Conventions
- Single files ≤ 800 lines; one component/widget per file.
.rssnake_case,.ts/.tsxkebab-case; source comments in English.- Conventional Commits:
<type>(<scope>): <subject>— scopes:editor,canvas,panels,ai,codegen,variables,figma,mcp,desktop,web,renderer,sdk,cli,agent,i18n.
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 · 28 lines · 539 tokens per session scan A 2a67b79f4884
openpencil AGENTS.md is an instructions file published in the GitHub repository ZSeven-W/openpencil (7,082 stars, last pushed yesterday), licensed MIT. It adds 539 tokens to every session, about $0.0022 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 2026-08-30.
openpencil AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| openpencil AGENTS.mdZSeven-W/openpencil | Instructions file | 7.1k | yesterday | MIT | A | 539 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |