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/compozy/compozy/assistant-ui-primitivesnpx skills add compozy/compozy --skill assistant-ui-primitivesgit clone --depth 1 https://github.com/compozy/compozyWhat 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 | $0.00028 | $0.00959 |
| Opus 5 | $0.00014 | $0.00479 |
| Sonnet 5 | $0.00006 | $0.00192 |
| Haiku 4.5 | $0.00003 | $0.00096 |
Grade A, and why
assistant-ui-primitives 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 3d 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.
How it starts
The opening of the file, as written. The whole thing — 131 lines — stays where its author put it; the contents beside it link to each section on GitHub.
assistant-ui Primitives
Always consult assistant-ui.com/llms.txt for latest API.
Composable, unstyled components following Radix UI patterns.
References
- ./references/thread.md -- ThreadPrimitive deep dive
- ./references/composer.md -- ComposerPrimitive deep dive
- ./references/message.md -- MessagePrimitive deep dive
- ./references/action-bar.md -- ActionBarPrimitive deep dive
Import
import {
AuiIf,
ThreadPrimitive,
ComposerPrimitive,
MessagePrimitive,
ActionBarPrimitive,
BranchPickerPrimitive,
AttachmentPrimitive,
ThreadListPrimitive,
ThreadListItemPrimitive,
} from "@assistant-ui/react";
Primitive Parts
| Primitive | Key Parts |
|---|---|
ThreadPrimitive |
.Root, .Viewport, .Messages, .Empty, .ScrollToBottom |
ComposerPrimitive |
.Root, .Input, .Send, .Cancel, .Attachments |
MessagePrimitive |
.Root, .Parts/.Content, .If, .Error |
ActionBarPrimitive |
.Copy, .Edit, .Reload, .Speak, .FeedbackPositive, .FeedbackNegative, .ExportMarkdown |
BranchPickerPrimitive |
.Previous, .Next, .Number, .Count |
Custom Thread Example
function CustomThread() {
return (
<ThreadPrimitive.Root className="flex flex-col h-full">
<ThreadPrimitive.Empty>
<div className="flex-1 flex items-center justify-center">
Start a conversation
</div>
</ThreadPrimitive.Empty>
<ThreadPrimitive.Viewport className="flex-1 overflow-y-auto p-4">
<ThreadPrimitive.Messages components={{
UserMessage: CustomUserMessage,
AssistantMessage: CustomAssistantMessage,
}} />
</ThreadPrimitive.Viewport>
<ComposerPrimitive.Root className="border-t p-4 flex gap-2">
<ComposerPrimitive.Input className="flex-1 rounded-lg border px-4 py-2" />
<ComposerPrimitive.Send className="bg-blue-500 text-white px-4 py-2 rounded-lg">
Send
</ComposerPrimitive.Send>
</ComposerPrimitive.Root>
</ThreadPrimitive.Root>
);
}
What ships with it
4 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.
- 3d ago First seen · 131 lines · 28 tokens per session scan A 963ec1b1e9ce
assistant-ui-primitives is a skill published in the GitHub repository compozy/compozy (2,703 stars, last pushed today), licensed MIT. It adds 28 tokens to every session and 959 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 2026-08-30.
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