OpenDesign is an open-source, local-first desktop app that lets coding agents create prototypes, dashboards, slide decks, images, video, and design systems as exportable files. It is used by people working with agent runtimes such as Claude Code, Codex, Cursor, and DeepSeek Harness. The catalogue add-ons extend the OpenDesign workflow with skills, instructions, commands, and plugins.
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.
npx agentmods add skills/nexu-io/open-design/todo-writenpx skills add nexu-io/open-design --skill todo-writegit clone --depth 1 https://github.com/nexu-io/open-designWrote 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/nexu-io/open-design/todo-write)<a href="https://agentmods.dev/skills/nexu-io/open-design/todo-write"><img src="https://agentmods.dev/badge/skills/nexu-io/open-design/todo-write.svg" alt="Measured on agentmods" 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 | $0.00015 | $0.00195 |
| Opus 5 | $0.00008 | $0.00097 |
| Sonnet 5 | $0.00003 | $0.00039 |
| Haiku 4.5 | $0.00002 | $0.00019 |
Grade A, and why
todo-write 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 2d 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:
- todo-write — 92% identical, 2 lines differ
What it actually says
Todo write
Before writing any artifact files, the agent commits to a numbered plan via the TodoWrite tool. The plan is the audit trail; subsequent turns either tick items off or rewrite the plan. The atom's prompt fragment teaches the agent to:
- Keep todos atomic (one verb per todo).
- Reorder freely as the picture sharpens.
- Mark a todo complete only after the matching artifact lands.
- Surface blockers as todos — never silently skip.
The OpenDesign daemon does not enforce a particular tool name; the agent is free to use TodoWrite (Claude Code) or an in-prompt list. The atom's job is to keep "make a plan first" in the system prompt so non-trivial workflows don't skip the planning step.
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.
- 2d ago First seen · 25 lines · 15 tokens per session scan A 1c8f7925130e
todo-write is a skill published in the GitHub repository nexu-io/open-design (94,103 stars, last pushed today), licensed Apache-2.0. It adds 15 tokens to every session and 195 once invoked, about $0.0001 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 2026-09-03.
Other skills, from other repositories
deck-guizang-editorial
电子杂志 × 电子墨水; 10 个版面 + 5 套调色板 (墨水/靛蓝瓷/森林墨/牛皮纸/沙丘).
deck-open-slide-canvas
锁死 1920×1080 画布, React 组件级自由组合, 不绑模板.
frame-flowchart-sticky
SVG 曲线连接 + 便利贴节点 + 光标交互, 像白板 brainstorm.
social-spotify-card
Spotify Now Playing 风格卡: 专辑封面 + 进度条 + 播放控制, 适配视频叠加 / 个人主页.
social-x-post-card
拟真 X 推文卡片 + 互动数据 (likes/reposts/views), 适配视频叠加或图卡分享.
video-hyperframes
Hyperframes / Remotion 兼容的连续帧动画, 可自动播放.