Agent skill

Assistant UI Tools

Guide for tool registration and tool UI in assistant-ui. An agent skill from compozy/compozy.

Install Assistant UI Tools

skills CLI

$ npx skills add compozy/compozy --skill assistant-ui-tools -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install compozy/compozy assistant-ui-tools --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/compozy/compozy.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/assistant-ui/assistant-ui-tools .claude/skills/assistant-ui-tools && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "assistant-ui-tools" agent skill from https://github.com/compozy/compozy/tree/main/.agents/skills/assistant-ui/assistant-ui-tools into .claude/skills/assistant-ui-tools/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "assistant-ui-tools", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/compozy/compozy/tree/main/.agents/skills/assistant-ui/assistant-ui-tools

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add compozy/compozy --skill assistant-ui-tools -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install compozy/compozy assistant-ui-tools --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/compozy/compozy.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/assistant-ui/assistant-ui-tools .agents/skills/assistant-ui-tools && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "assistant-ui-tools" agent skill from https://github.com/compozy/compozy/tree/main/.agents/skills/assistant-ui/assistant-ui-tools into .agents/skills/assistant-ui-tools/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "assistant-ui-tools", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add compozy/compozy --skill assistant-ui-tools -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install compozy/compozy assistant-ui-tools --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/compozy/compozy.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/assistant-ui/assistant-ui-tools .cursor/skills/assistant-ui-tools && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "assistant-ui-tools" agent skill from https://github.com/compozy/compozy/tree/main/.agents/skills/assistant-ui/assistant-ui-tools into .cursor/skills/assistant-ui-tools/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "assistant-ui-tools", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/compozy/compozy.git --path .agents/skills/assistant-ui/assistant-ui-tools

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add compozy/compozy --skill assistant-ui-tools -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install compozy/compozy assistant-ui-tools --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/compozy/compozy.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/assistant-ui/assistant-ui-tools .gemini/skills/assistant-ui-tools && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "assistant-ui-tools" agent skill from https://github.com/compozy/compozy/tree/main/.agents/skills/assistant-ui/assistant-ui-tools into .gemini/skills/assistant-ui-tools/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "assistant-ui-tools", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install compozy/compozy assistant-ui-tools

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add compozy/compozy --skill assistant-ui-tools -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/compozy/compozy.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/assistant-ui/assistant-ui-tools .github/skills/assistant-ui-tools && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "assistant-ui-tools" agent skill from https://github.com/compozy/compozy/tree/main/.agents/skills/assistant-ui/assistant-ui-tools into .github/skills/assistant-ui-tools/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "assistant-ui-tools", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add compozy/compozy --skill assistant-ui-tools -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install compozy/compozy assistant-ui-tools --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/compozy/compozy.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/assistant-ui/assistant-ui-tools .opencode/skills/assistant-ui-tools && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "assistant-ui-tools" agent skill from https://github.com/compozy/compozy/tree/main/.agents/skills/assistant-ui/assistant-ui-tools into .opencode/skills/assistant-ui-tools/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "assistant-ui-tools", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: assistant-ui-tools
GitHub stars: 2.8k
Token cost: ~868 tokens
SKILL.md length: 81 words
Files: 4 (incl. references)
Skills in repo: 47
Repo updated: Oct 8, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Guide for tool registration and tool UI in assistant-ui. An agent skill from compozy/compozy.

Implementing LLM tools
SKILL.md covers References, Tool Types, Backend Tool with UI and Frontend-Only Tool, plus 3 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
Tool call rendering

What it does

Assistant UI Tools is an agent skill from compozy/compozy. Guide for tool registration and tool UI in assistant-ui. Use when implementing LLM tools, tool call rendering, or human-in-the-loop patterns.

Its SKILL.md is about 870 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `references/human-in-loop.md`, `references/make-tool.md` and `references/tool-ui.md`).

It sits in Agent Workflows, covering Human-in-the-loop approvals. The repository describes itself as: An operating system for AI agents. Plug in the agent CLIs you already use (Claude Code, Codex, Gemini CLI, Cursor) and they become a team: they split the work, hand tasks to each… The licence is MIT.

When your agent uses it

Implementing LLM tools
Tool call rendering
Human-in-the-loop patterns

Example prompts

“/assistant-ui-tools”

What it can do on your machine

Read from SKILL.md and the folder at commit eec2ed1. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are typescript).
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
- assistant-ui.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Assistant UI Tools loads about 868 tokens when it runs, and up to ~6k if it reads all its reference files. Until then it costs about 40 tokens; SKILL.md has 81 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~40
When it runs · the whole SKILL.md, loaded when a task matches: ~868
With references · SKILL.md plus every file in references/, read only if the agent opens them: ~6k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from compozy/compozy at commit eec2ed1, republished under its MIT licence (© compozy). 81 words, ~868 tokens.

Download SKILL.mdSave it as .claude/skills/assistant-ui-tools/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.

name: assistant-ui-tools
description: Guide for tool registration and tool UI in assistant-ui. Use when implementing LLM tools, tool call rendering, or human-in-the-loop patterns.
version: 0.0.1
license: MIT

assistant-ui Tools

Always consult assistant-ui.com/llms.txt for latest API.

Tools let LLMs trigger actions with custom UI rendering.

References

./references/make-tool.md -- makeAssistantTool/useAssistantTool
./references/tool-ui.md -- makeAssistantToolUI rendering
./references/human-in-loop.md -- Confirmation patterns

Tool Types

Where does the tool execute?
├─ Backend (LLM calls API) → AI SDK tool()
│  └─ Want custom UI? → makeAssistantToolUI
└─ Frontend (browser-only) → makeAssistantTool
   └─ Want custom UI? → makeAssistantToolUI

Backend Tool with UI

// Backend (app/api/chat/route.ts)
import { tool, stepCountIs } from "ai";
import { z } from "zod";

const tools = {
  get_weather: tool({
    description: "Get weather for a city",
    inputSchema: z.object({ city: z.string() }),
    execute: async ({ city }) => ({ temp: 22, city }),
  }),
};

const result = streamText({
  model: openai("gpt-4o"),
  messages,
  tools,
  stopWhen: stepCountIs(5),
});

tsx

// Frontend
import { makeAssistantToolUI } from "@assistant-ui/react";

const WeatherToolUI = makeAssistantToolUI({
  toolName: "get_weather",
  render: ({ args, result, status }) => {
    if (status === "running") return <div>Loading weather...</div>;
    return <div>{result?.city}: {result?.temp}°C</div>;
  },
});

// Register in app
<AssistantRuntimeProvider runtime={runtime}>
  <WeatherToolUI />
  <Thread />
</AssistantRuntimeProvider>

Frontend-Only Tool

tsx

import { makeAssistantTool } from "@assistant-ui/react";
import { z } from "zod";

const CopyTool = makeAssistantTool({
  toolName: "copy_to_clipboard",
  parameters: z.object({ text: z.string() }),
  execute: async ({ text }) => {
    await navigator.clipboard.writeText(text);
    return { success: true };
  },
});

<AssistantRuntimeProvider runtime={runtime}>
  <CopyTool />
  <Thread />
</AssistantRuntimeProvider>

API Reference

tsx

// makeAssistantToolUI props
interface ToolUIProps {
  toolCallId: string;
  toolName: string;
  args: Record<string, unknown>;
  argsText: string;
  result?: unknown;
  status: "running" | "complete" | "incomplete" | "requires-action";
  submitResult: (result: unknown) => void;  // For interactive tools
}

Human-in-the-Loop

tsx

const DeleteToolUI = makeAssistantToolUI({
  toolName: "delete_file",
  render: ({ args, status, submitResult }) => {
    if (status === "requires-action") {
      return (
        <div>
          <p>Delete {args.path}?</p>
          <button onClick={() => submitResult({ confirmed: true })}>Confirm</button>
          <button onClick={() => submitResult({ confirmed: false })}>Cancel</button>
        </div>
      );
    }
    return <div>File deleted</div>;
  },
});

Common Gotchas

Tool UI not rendering

toolName must match exactly (case-sensitive)
Register UI inside AssistantRuntimeProvider

Tool not being called

Check tool description is clear
Use stopWhen: stepCountIs(n) to allow multi-step

Result not showing

Tool must return a value
Check status === "complete" before accessing result

Files

SKILL.md and 3 other files (references) in .agents/skills/assistant-ui/assistant-ui-tools of compozy/compozy.

SKILL.md
references/human-in-loop.md
references/make-tool.md
references/tool-ui.md

Open the folder on GitHubat commit eec2ed1

Compare with similar skills

Assistant UI Tools next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Assistant UI Tools compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Assistant UI Tools this skillcompozy/compozy	2.8k	—	~868	Automated safety check: Pass	MIT	today
Show Me Your Work Decision Logcursor/plugins	10k	9 repos	~1.6k	Automated safety check: Pass	None	today
Darwin Skill Optimizeralchaincyf/darwin-skill	6.2k	1 repos	~4.7k	Automated safety check: Pass	MIT	19 days ago
Loop Constraints Enforcercobusgreyling/loop-engineering	11k	1 repos	~475	Automated safety check: Notes	MIT	today
Ask User QuestionMemTensor/MemOS	12k	—	~1k	Automated safety check: Pass	Apache-2.0	9 days ago
Agentmemory Forgetrohitg00/agentmemory	29k	—	~612	Automated safety check: Pass	Apache-2.0	yesterday

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Questions about Assistant UI Tools

What does Assistant UI Tools do?

Guide for tool registration and tool UI in assistant-ui. An agent skill from compozy/compozy. Assistant UI Tools is an agent skill from compozy/compozy. Guide for tool registration and tool UI in assistant-ui.

When should I use Assistant UI Tools?

Assistant UI Tools fits situations like: implementing LLM tools; tool call rendering; human-in-the-loop patterns.

How do I install Assistant UI Tools in Claude Code?

Run `npx skills add compozy/compozy --skill assistant-ui-tools -a claude-code`. Or copy the skill folder (.agents/skills/assistant-ui/assistant-ui-tools in compozy/compozy) into .claude/skills/assistant-ui-tools in your project. Claude Code loads it when a task matches its description.

How do I install Assistant UI Tools in Codex?

Run `npx skills add compozy/compozy --skill assistant-ui-tools -a codex`. Or copy the skill folder (.agents/skills/assistant-ui/assistant-ui-tools in compozy/compozy) into .agents/skills/assistant-ui-tools in your project. Codex loads it when a task matches its description.

Can I use Assistant UI Tools in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add compozy/compozy --skill assistant-ui-tools -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/assistant-ui-tools, .gemini/skills/assistant-ui-tools, .github/skills/assistant-ui-tools and .opencode/skills/assistant-ui-tools in your project.

What does Assistant UI Tools need to run?

SKILL.md names no scripts, command-line tools or credentials: Assistant UI Tools is instructions for the agent only.

Does Assistant UI Tools access the network?

SKILL.md names 1 domain. As links in the text: assistant-ui.com. This is read from the text; nothing was executed.

Is Assistant UI Tools safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Assistant UI Tools use?

Assistant UI Tools is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Assistant UI Tools use?

About 868 tokens (SKILL.md is roughly 3.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 5.1k tokens, read only when the agent opens those files.

What are the alternatives to Assistant UI Tools?

Skills that share tags, products or a category with Assistant UI Tools: Show Me Your Work Decision Log (cursor/plugins, 10k stars), Darwin Skill Optimizer (alchaincyf/darwin-skill, 6.2k stars), Loop Constraints Enforcer (cobusgreyling/loop-engineering, 11k stars) and Ask User Question (MemTensor/MemOS, 12k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Assistant UI Tools?

compozy (a GitHub organization) maintains it in compozy/compozy, which has 2,792 GitHub stars. The repository holds 47 skills in this directory. The repository was last updated on October 8, 2026.

Source: compozy/compozy on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Assistant UI Tools

Install Assistant UI Tools

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

assistant-ui Tools

References

Tool Types

Backend Tool with UI

Frontend-Only Tool

API Reference

Human-in-the-Loop

Common Gotchas

Files

Compare with similar skills

Similar skills

Show Me Your Work Decision Log

Darwin Skill Optimizer

Loop Constraints Enforcer

Ask User Question

Agentmemory Forget

PUA High-Agency Governance

More from compozy/compozy

Eng Real Scenario QA

Eng Test Conventions

Assistant UI

Assistant UI Primitives

Assistant UI Runtime

Assistant UI Streaming

Questions about Assistant UI Tools

Install Assistant UI Tools

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

assistant-ui Tools

References

Tool Types

Backend Tool with UI

Frontend-Only Tool

API Reference

Human-in-the-Loop

Common Gotchas

Files

Compare with similar skills

Similar skills

More from compozy/compozy

Related

Questions about Assistant UI Tools