Notre avis
A2UI Atomic Catalog permet à un agent IA de générer de véritables interfaces interactives (graphiques, jauges, steppers, tableaux de bord, arbres de décision) via un serveur MCP, sans écrire de HTML à la main.
Points forts
- Vocabulaire fixe de 474 composants typés, ce qui évite les hallucinations HTML.
- Serveur MCP sans authentification, gratuit et open source.
- Rendu soit directement dans la conversation, soit via un lien partageable.
- Schémas JSON stricts pour chaque atome, évitant les erreurs de validation.
Limites
- Ne récupère pas de données en direct au-delà des sources déjà déclarées.
- Nécessite un hôte capable d'afficher du HTML ou d'ouvrir un lien.
- Le catalogue complet est volumineux; il faut sélectionner la bonne section pour éviter de surcharger le contexte.
Quand l'utilisateur doit voir un visuel interactif (graphique, jauge, dashboard) et que l'hôte agent est compatible MCP avec rendu HTML ou lien.
Quand une réponse en texte simple suffit ou que l'hôte ne peut pas afficher le rendu HTML ni ouvrir un lien.
Analyse de sécurité
PrudenceThe skill does not include destructive or exfiltrating commands, but it instructs the agent to interact with an external network service for rendering UI, which falls under legitimate network tool usage. No shell commands or secret exfiltration are present, but the external dependency warrants caution.
- •Directs the agent to connect to an external MCP server (https://a2uicatalog.ai/mcp) over the network without authentication, which could expose data or enable remote tool execution if the server is compromised.
Exemples
Use the A2UI Atomic Catalog to render an interactive dashboard with a gauge and a line chart showing these quarterly sales numbers: Q1 120k, Q2 145k, Q3 132k, Q4 168k.Using the A2UI catalog, show a decision tree for troubleshooting API error codes 400, 401, 403, 429, and 5xx.Render a stepper UI for a 3-step onboarding flow (Create account → Connect workspace → Invite teammates) with the A2UI Atomic Catalog.name: a2ui-atomic-catalog description: Renders real interactive UI — charts, gauges, steppers, dashboards, decision trees — for AI agents instead of generating raw HTML. Use this skill when a user needs to SEE something rather than read a description of it, and the host (Claude, another MCP client, a Gemini Enterprise agent) can display rendered visuals or open a link. Do not use for plain prose answers, for data retrieval (this renders data, it does not fetch it beyond a few declared sources), or on hosts that cannot display HTML.
A2UI Atomic Catalog
474 typed UI atoms an AI agent composes into real rendered interfaces — web, Google Meet, Apps Script, Google Chat and MCP Apps — instead of writing HTML by hand. The agent names a component from a fixed vocabulary; a renderer that already knows that component draws it.
Connect
MCP server, no auth, no signup, no API key:
https://a2uicatalog.ai/mcp
POST speaks JSON-RPC 2.0 (MCP Streamable HTTP). GET with Accept: application/json
returns a machine-readable descriptor listing every tool, current rate limits, and
documentation links.
How to use it
list_catalogs— pick the catalog slice the task actually needs. Do not load the whole 474-atom vocabulary into context for a one-chart request.get_catalog— read the real field contracts for that slice. Never guess a field name; a hallucinated field is a validation error, not a broken render.- Render, by host capability:
render_surface— MCP Apps-capable hosts (Claude.ai and others): renders inline in the conversation, no URL.preview_url— any other host: returns a shareable link (rate-limited demo renderer).make_surface_url— render against the caller's own deployed renderer instead of the shared demo one; no rate limit.
When this is the wrong tool
- The answer is better as prose than a visual.
- The host cannot display HTML or open a link.
- The task needs live data this catalog doesn't already declare a source for — this skill renders data, it does not fetch arbitrary data.
Reference
| Document | URL | |---|---| | OpenAPI specification | https://a2uicatalog.ai/openapi.json | | Full atom vocabulary | https://a2uicatalog.ai/spec.json | | Strict per-atom JSON Schema | https://a2uicatalog.ai/catalogue/atoms-json-schema.json | | Agent overview | https://a2uicatalog.ai/llms.txt | | A2A agent card | https://a2uicatalog.ai/.well-known/agent-card.json |
Free, MIT licensed, no signup. Independent, unofficial project — not affiliated with, endorsed by, or sponsored by Google or Anthropic. A2UI is Google's protocol; MCP is Anthropic's. Source: https://github.com/a2uicatalog/a2ui
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