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 skills add nexu-io/open-design --skill tweaksgit 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/tweaks)<a href="https://agentmods.dev/skills/nexu-io/open-design/tweaks"><img src="https://agentmods.dev/badge/skills/nexu-io/open-design/tweaks/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/nexu-io/open-design/tweaks"><img src="https://agentmods.dev/badge/skills/nexu-io/open-design/tweaks.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Snyk pass
- NVIDIA SkillSpector pass
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 | $0.00102 | $0.03007 |
| Opus 5 | $0.00051 | $0.01503 |
| Sonnet 5 | $0.00020 | $0.00601 |
| Haiku 4.5 | $0.00010 | $0.00301 |
Grade A, and why
tweaks 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 6d 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:
- tweaks — 95% identical, 2 lines differ
How it starts
The opening of the file, as written. The whole thing — 305 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Tweaks Skill · 参数化变体面板
Wrap any HTML artifact with a side panel of live controls that rewrite
CSS custom properties in real time and persist to localStorage.
Inspired by the huashu-design tweak pattern.
What you produce
A single self-contained HTML file with two layers:
- Stage — the original artifact (landing page / deck / dashboard)
re-keyed so all visual decisions read from CSS custom properties:
--accent,--scale,--density,--mode,--motion. - Panel — a fixed sidebar (or drawer on small viewports) with
form controls bound to those custom properties via a tiny
vanilla-JS bridge. Persists every change to
localStoragekeyed by the artifact identifier.
The user can:
- Open the artifact and see the stage rendered with their saved preferences (or sensible defaults).
- Adjust accent / scale / density / mode / motion in the panel and watch the stage update instantly — no rerender.
- Press T to hide / reveal the panel; R to reset to defaults.
- Refresh the page — every choice is persisted.
When to use
- The user generated something they like 80% of, and wants to dial in the last 20% themselves.
- You're presenting a design system / brand and want the audience to feel the variants live (instead of you re-running the agent).
- You're shipping a stand-alone demo (e.g. a portfolio piece) and want viewers to play.
When not to use
- One-shot artifacts that won't be iterated on (e.g. a runbook — parameters don't help).
- When the artifact's value is in fixed ratios (e.g. an infographic with carefully balanced data viz — knobs would degrade it).
The 5 standard knobs
Pick a subset that suits the artifact. Don't ship all 5 if only 2 matter — clutter is a regression.
1. --accent — Accent color
A select with 5–8 curated swatches (don't ship a free color picker — the user will pick a bad color and blame you).
const ACCENT_PRESETS = [
{ id: 'rust', val: '#c96442', label: 'Rust' },
{ id: 'cobalt', val: '#2c4d8e', label: 'Cobalt' },
{ id: 'sage', val: '#4a7a3f', label: 'Sage' },
{ id: 'plum', val: '#7a3f6a', label: 'Plum' },
{ id: 'graphite',val: '#3a3a3a', label: 'Graphite' },
];
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.
- 6d ago First seen · 305 lines · 102 tokens per session scan A 20bf24da801d
tweaks is a skill published in the GitHub repository nexu-io/open-design (94,754 stars, last pushed yesterday), licensed Apache-2.0. It adds 102 tokens to every session and 3,007 once invoked, about $0.0005 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.
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