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chat-apps-ui-sdk

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Aktualisiert27. Mai 2026 um 12:19

Interactive UI rendered inside ChatGPT or Claude — OpenAI Apps SDK apps, MCP Apps (the @modelcontextprotocol/ext-apps standard), or MCP-UI components, with a Next.js/React server. Covers the MCP tool and resource architecture, the window.openai / ui-bridge data flow, widget state, sandbox/CSP security, display modes, visual design, and directory submission. Trigger when building, reviewing, or designing such apps — even when the user only says "chat app", "ChatGPT widget", "Claude app", "render UI in chat", "window.openai", "createUIResource", "outputTemplate", or "MCP app UI" without naming a specific SDK.

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name

chat-apps-ui-sdk

description

Chat Apps UI SDK Best Practices

A reference for building beautiful, review-ready apps that render interactive UI inside the chat surface of ChatGPT and Claude. As of January 2026 these platforms share one foundation — the MCP Apps standard (@modelcontextprotocol/ext-apps), rendered by Claude, ChatGPT, VS Code, and Goose. The OpenAI Apps SDK is a superset adding the window.openai bridge, and MCP-UI (@mcp-ui/server / @mcp-ui/client) is the community implementation. This skill contains 46 rules across 8 categories, ordered by impact so the highest-leverage decisions come first.

The mental model: an app is an MCP tool first, UI second. The model invokes a tool; the tool returns data plus a link to a UI resource; the host renders that resource in a sandboxed iframe; the iframe talks back over a defined bridge. Mistakes early in that chain mean nothing renders; mistakes later mean it renders broken, unsafe, or unpolished.

When to Apply

Reference these guidelines when:

Designing the MCP tool and structuredContent / content / _meta contract for a chat app
Wiring a tool to a component (_meta.ui.resourceUri, the text/html;profile=mcp-app MIME type, the ui:// scheme)
Writing the iframe component and its bridge (window.openai, ui/notifications/*, MCP-UI onUIAction)
Choosing display modes, widget state, theming, and responsive layout
Hardening a chat app (CSP, sandbox, secrets, OAuth) or preparing it for directory submission
Reviewing or refactoring existing ChatGPT-app / Claude-app / MCP-UI code

Rule Categories by Priority

Priority	Category	Impact	Prefix
1	MCP Tool & Discovery Design	CRITICAL	`tool-`
2	UI Resource Wiring & Templates	CRITICAL	`wire-`
3	Host–Component Data Bridge	HIGH	`bridge-`
4	Display Modes & Responsive Layout	HIGH	`display-`
5	State & Model Context	HIGH	`state-`
6	Security & Data Boundaries	HIGH	`sec-`
7	Visual Design & UX Polish	MEDIUM-HIGH	`design-`
8	Distribution & Cross-Host Portability	MEDIUM	`dist-`

Quick Reference

1. MCP Tool & Discovery Design (CRITICAL)

tool-structured-content-contract - Split output across structuredContent, content, and _meta
tool-specific-verb-names - Name tools as specific action verbs
tool-output-schema-validation - Declare an output schema for structuredContent
tool-safety-annotations - Set readOnlyHint and destructiveHint accurately
tool-minimal-scoped-inputs - Request minimal, task-scoped tool inputs
tool-feed-widget-in-response - Return everything the widget needs in one response
tool-honest-descriptions - Write honest tool descriptions and status text

2. UI Resource Wiring & Templates (CRITICAL)

wire-resource-uri-link - Link each tool to its UI with resourceUri
wire-mcp-app-mimetype - Serve UI resources with the mcp-app MIME type
wire-ui-scheme-and-handler - Match the ui:// URI to a registered resource
wire-version-uri-cache-key - Version the resource URI as a cache key
wire-inline-self-contained-bundle - Inline the component bundle into the resource
wire-set-ui-domain - Set a unique ui.domain for the component

3. Host–Component Data Bridge (HIGH)

bridge-render-from-notifications - Render from tool output, not first paint
bridge-call-tools-app-visibility - Expose tools to the app before calling them
bridge-followup-vs-silent-call - Choose follow-up messages or silent tool calls
bridge-validate-postmessage-origin - Validate postMessage source in the host
bridge-handle-all-mcpui-actions - Handle every MCP-UI onUIAction type
bridge-use-host-apis - Use host bridge APIs instead of reimplementing

4. Display Modes & Responsive Layout (HIGH)

display-pick-the-right-mode - Pick the display mode that fits the task
display-request-mode-with-fallback - Request fullscreen but render inline first
display-report-intrinsic-height - Report intrinsic height and respect maxHeight
display-avoid-nested-scroll - Avoid nested scroll inside inline cards
display-respect-theme - Respect the host theme and color scheme
display-responsive-breakpoints - Collapse layout gracefully on small screens

5. State & Model Context (HIGH)

state-separate-three-stores - Separate widget, server, and model state
state-persist-widget-state - Persist UI state through setWidgetState
state-no-secrets-in-state - Keep secrets and PII out of widget state
state-update-model-context - Push user decisions to model context
state-keep-state-small - Keep widget state small and serializable

6. Security & Data Boundaries (HIGH)

sec-declare-csp-allowlist - Declare a CSP allowlist for the widget
sec-avoid-frame-domains - Avoid nested frame domains in the widget
sec-no-secrets-in-payloads - Never embed secrets in bundles or payloads
sec-enforce-server-side-auth - Enforce authorization on the server
sec-signal-oauth-challenge - Signal auth with a www-authenticate challenge
sec-minimize-restricted-data - Minimize and avoid restricted data inputs

7. Visual Design & UX Polish (MEDIUM-HIGH)

design-inherit-native-typography - Inherit native fonts and limit type sizes
design-restrain-brand-color - Restrain brand color to accents
design-render-loading-empty-error - Render loading, empty, and error states
design-meet-wcag-contrast - Meet WCAG AA contrast and provide alt text
design-limit-actions-hierarchy - Limit actions and keep a clear hierarchy
design-respect-reduced-motion - Respect reduced-motion preferences

8. Distribution & Cross-Host Portability (MEDIUM)

dist-build-on-mcp-apps-standard - Build on the shared MCP Apps standard
dist-degrade-without-ui - Return a text fallback when UI is unsupported
dist-provide-submission-metadata - Provide accurate submission metadata
dist-feature-detect-host-apis - Detect host capabilities before use

How to Use

Read the individual reference files for full explanations and incorrect-vs-correct code examples. Start at the top — category 1 (tool-) and category 2 (wire-) gate whether anything renders at all, so resolve those before touching display or design.

Section definitions - Category structure and impact levels
Rule template - Template for adding new rules
AGENTS.md - Compiled table of contents across all rules

Reference Files

File	Description
references/_sections.md	Category definitions and impact ordering
assets/templates/_template.md	Template for new rules
metadata.json	Version and reference URLs

Related Skills

build-mcp-server — Entry point for designing the MCP server shape (deployment model, tool patterns) this skill's UI rules build on top of.