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 TommyBez/evex --skill openuigit clone --depth 1 https://github.com/TommyBez/evexWrote 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/tommybez/evex/openui)<a href="https://agentmods.dev/skills/tommybez/evex/openui"><img src="https://agentmods.dev/badge/skills/tommybez/evex/openui/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/tommybez/evex/openui"><img src="https://agentmods.dev/badge/skills/tommybez/evex/openui.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- 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 | $0.00031 | $0.00411 |
| Opus 5.5 | $0.00012 | $0.00164 |
| Sonnet 5.5 | $0.00006 | $0.00082 |
| Haiku 4.5 | $0.00003 | $0.00041 |
Grade A, and why
openui 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
OpenUI Lang
Every assistant reply is an OpenUI Lang program whose first statement assigns
root. This agent uses openuiChatLibrary from @openuidev/react-ui/genui-lib
(the same library as the official
openui-chat
example). The build-time system prompt comes from
openuiChatLibrary.prompt(openuiChatPromptOptions).
Chat library constraints
openuiChatLibrary centers on chat primitives: Card, CardHeader, TextContent,
Table, lists, and follow-ups. Do not use Stack; it belongs to the broader
OpenUI library, not this agent's chat library.
For a layout example, see syntax-examples.
Debugging checklist
- Confirm the reply starts with
root = ... - Confirm every referenced identifier is defined
- Confirm tool-backed values match the latest tool JSON
- Remove markdown fences or prose around the program
- Re-run with a smaller layout if the stream was truncated
Done when each item is confirmed or ruled out and the reply is a valid OpenUI
Lang program starting with root =.
Frontend integration
For Next.js + Eve wiring (dependencies, withEve(), OpenUIEveChat, accessibility,
smoke tests), see frontend-wiring.
External references
- OpenUI docs: https://www.openui.com/docs/openui-lang/overview
- Language spec: https://www.openui.com/docs/openui-lang/specification
- Example app: https://github.com/thesysdev/openui/tree/main/examples/openui-chat
What ships with it
3 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.
- 2mo ago First seen · 44 lines · 31 tokens per session scan A c5e789e5878b
openui is a skill published in the GitHub repository TommyBez/evex (25 stars, last pushed 2mo ago), licensed MIT. It adds 31 tokens to every session and 411 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 2026-08-30.
openui compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| openuiTommyBez/evex | Skill | 25 | 2mo ago | MIT | A | 31 | Claude Code, Codex |
| webgl-holographic-foilnexu-io/open-design | Skill | 107k | today | Apache-2.0 | A | 41 | Claude Code, Codex |
| html-ppt-hermes-cyber-terminalnexu-io/open-design | Skill | 107k | today | Apache-2.0 | A | 53 | Claude Code, Codex |
| html-ppt-taste-brutalistnexu-io/open-design | Skill | 107k | today | Apache-2.0 | A | 78 | Claude Code, Codex |
| visual-ralphYeachan-Heo/oh-my-codex | Skill | 34k | 2d ago | MIT | A | 52 | Codex |
| glance-canonical-layoutsandroid/skills | Skill | 10k | 2d ago | Apache-2.0 | A | 56 | Claude Code |
| accessibilitymicrosoft/hve-core | Skill | 1.6k | today | MIT | A | 47 | Claude Code |