A guide for creating and checking A2UI v0.8 messages, which describe interactive user interfaces in JSON.

Building static interactive surfaces, validating A2UI JSON, and processing replies from interface controls.

It helps ensure generated interface data follows the format supported by the current renderer and handles user actions consistently.

a2ui-author — Skill for Claude Code and Codex by danielwpz/pokoclaw

Install

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.

Any agent

npx skills add danielwpz/pokoclaw --skill a2ui-author

Clone the repo

git clone --depth 1 https://github.com/danielwpz/pokoclaw

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/danielwpz/pokoclaw/a2ui-author/github.svg)](https://agentmods.dev/skills/danielwpz/pokoclaw/a2ui-author)

Your own site

<a href="https://agentmods.dev/skills/danielwpz/pokoclaw/a2ui-author"><img src="https://agentmods.dev/badge/skills/danielwpz/pokoclaw/a2ui-author/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/danielwpz/pokoclaw/a2ui-author"><img src="https://agentmods.dev/badge/skills/danielwpz/pokoclaw/a2ui-author.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 64 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 303 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

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	$0.00064	$0.00303
Opus 5.5	$0.00026	$0.00121
Sonnet 5.5	$0.00013	$0.00061
Haiku 4.5	$0.00006	$0.00030

Measured 2mo ago against content hash dc17dda9ccc1, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

a2ui-author 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.

The scan reads SKILL.md. This mod also ships 8 executable files (runtime/v0_8/callback.js, runtime/v0_8/index.js, runtime/v0_8/json.js, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

a2ui-author — 100% identical, 0 lines differ

skills/a2ui-author/SKILL.md · 32 lines

What it actually says

A2UI Author

Use this skill to work with the static A2UI v0.8 subset supported by the current renderer.

Workflow

Author A2UI server messages, not raw channel card JSON.
Read references/protocol.md for message structure, supported components, bindings, and current renderer adaptations.
Use references/examples.md for compact examples.
Validate generated JSON with the bundled script. Resolve <skill-dir> to this skill directory before running the command:

node <skill-dir>/scripts/validate-a2ui.js --version v0_8 path/to/a2ui.messages.json

For user replies, reason from A2UI userAction events. Do not expose raw channel callback payloads to application logic or an LLM.

Static Content Rule

Generate only static A2UI server messages: dataModelUpdate, surfaceUpdate, beginRendering, and deleteSurface. Do not emit messages or components outside the supported static subset documented in this skill.

Files

What ships with it

11 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.

Changes

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 · 32 lines · 64 tokens per session scan A dc17dda9ccc1

Subscribe to this mod's changes

a2ui-author is a skill published in the GitHub repository danielwpz/pokoclaw (140 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 64 tokens to every session and 303 once invoked, about $0.0003 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.

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