a2ui-compose SKILL.md skillA
a2ui-compose from a2uicatalog/a2ui is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add a2uicatalog/a2ui/a2ui-compose@v1.0.0Pins v1.0.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- a2uicatalog/a2ui
- Path
skills/a2ui-compose/SKILL.md- Versions recorded
- 1
- Latest version
- v1.0.0, committed Aug 22, 2026
- Size
- 4,176 bytes
- Repository stars
- 6
- License
- MIT
Compose an A2UI payload (typed atom blocks) and render it into real HTML — a chart, dashboard, status board, decision tree, or any structured UI, once the right atoms are already known (see the a2ui-catalog skill for picking them). Use when asked to SHOW something rather than describe it, and the host can display HTML or open a link. Not for connecting a new agent/host to the MCP server itself (see a2ui-mcp).
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Composing and rendering an A2UI payload
## The payload shape
```json
{
"title": "Weekly numbers",
"theme": "light",
"blocks": [
{ "type": "heading", "text": "This week" },
{ "type": "stat_card", "value": "1,234", "label": "Daily users", "delta": "+12%" }
]
}
```
`blocks` is an ordered array of atoms (the "blocks dialect"). A v1.0 `createSurface`
envelope (templates + dataModel bindings) is also accepted wherever a payload is taken —
`theme` is `light`, `dark`, or `terminal` (the catalog's own dark/monospace brand skin).
## Render, by host capability
- **MCP Apps-capable host** (renders inline in the conversation, no URL, no size
ceiling): `render_surface(payload)`.
- **Any other MCP host**: `preview_url(payload)` — a shareable link on the shared demo
renderer (rate-limited: 10 calls per client per 7 days).
- **No rate limit, your own deployment**: `make_surface_url(payload, renderer_url)` —
renders against a renderer YOU deployed (see the self-hosting quickstart below), or
omit `renderer_url` for the encoded-fragment + BYO guidance.
- **Protocol-free, no MCP client at all**: `POST https://a2uicatalog.ai/api/render` with
…Read the whole file at its exact version.
How to install
mdr add a2uicatalog/a2ui/a2ui-compose@sha256:d6750d93bb78ee31The line at the top of this page pins the label v1.0.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_uwspuqtv2h35wgcy)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Aug 22, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (4176 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
a2uicatalog/a2ui · 6 stars · license MIT · pushed 2026-10-30 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_uwspuqtv2h35wgcy GET https://markdownregistry.com/api/v1/resolve?ref=a2uicatalog/a2ui/a2ui-compose GET https://markdownregistry.com/api/v1/blob/d6750d93bb78ee31b8488eb16bfd9bd0f79ececdfb580780af19f20c16183de0
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.