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Works by allowing servers to declare UI components (forms, buttons, displays) that clients interpret and render natively, maintaining the request-response contract of MCP while adding a presentation layer for rich interactions beyond text.","intents":["I want my MCP server to show interactive forms or buttons to users without leaving the chat interface","I need to display structured data visualizations or dashboards within a conversational context","I want to build a tool that guides users through multi-step workflows with UI feedback"],"best_for":["MCP server developers building tools that require user interaction beyond text","Teams creating conversational AI applications with rich UI requirements","Developers migrating from REST APIs with custom frontends to MCP-based architectures"],"limitations":["UI rendering depends on client support — not all MCP clients implement the UI extension","Limited to UI patterns that can be expressed in the MCP Apps schema; custom JavaScript or advanced CSS not supported","No built-in state persistence across conversation turns — UI state must be managed by the server","Client-side rendering capabilities vary; complex layouts may degrade on resource-constrained clients"],"requires":["Node.js 16+ or compatible JavaScript runtime","@modelcontextprotocol/sdk package for base MCP functionality","MCP client that supports the Apps extension (e.g., Claude desktop client with UI support enabled)","Understanding of MCP protocol and server implementation patterns"],"input_types":["MCP tool definitions with UI schema annotations","JSON schema describing form fields and UI components","Server-side state and data to populate UI elements"],"output_types":["Rendered UI components in client","User interactions (form submissions, button clicks) as MCP messages","Structured data from UI interactions back to server"],"categories":["tool-use-integration","ui-rendering"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-modelcontextprotocolext-apps__cap_1","uri":"capability://code.generation.editing.schema.based.ui.component.declaration.and.validation","name":"schema-based ui component declaration and validation","description":"Provides a TypeScript/JavaScript SDK for declaring UI components (forms, buttons, text displays, etc.) using JSON schema definitions that are validated and serialized for transmission to MCP clients. 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When users submit forms in the client, the server receives structured, validated data back through the MCP protocol, allowing servers to react to user interactions and update UI state accordingly.","intents":["I want to collect user input through a form and process it in my MCP server","I need to validate form fields before submission and show validation errors to users","I want to build a multi-step workflow where each form submission triggers the next step"],"best_for":["MCP server developers building data collection tools","Teams creating conversational workflows that require structured user input","Developers building configuration or setup wizards"],"limitations":["Form validation is declarative only; complex conditional validation logic must be implemented server-side","No built-in file upload support; file handling requires custom implementation","Form state is not persisted across conversation turns without explicit server-side management","Client-side validation rules are limited to the schema specification; custom validators not supported"],"requires":["MCP server implementation with Apps extension support","Client that supports form rendering (e.g., Claude with UI extension)","Understanding of form field types and validation schema syntax","Handler functions to process form submissions"],"input_types":["Form field definitions with types and validation rules","User input from form submissions","Validation schema objects"],"output_types":["Structured form data as JSON objects","Validation error messages","Server-side processing results"],"categories":["tool-use-integration","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-modelcontextprotocolext-apps__cap_3","uri":"capability://tool.use.integration.client.side.ui.state.management.and.reactivity","name":"client-side ui state management and reactivity","description":"Allows MCP servers to manage UI state on the client side by sending UI update messages that modify rendered components reactively. Servers can update form values, show/hide elements, enable/disable buttons, or change display content without requiring a full UI re-render, enabling responsive interactions and progressive disclosure patterns within conversational clients.","intents":["I want to update UI elements in response to user actions without re-rendering the entire interface","I need to show/hide form fields conditionally based on user selections","I want to provide real-time feedback (loading states, validation messages) as users interact with forms"],"best_for":["MCP server developers building interactive, responsive tools","Teams creating progressive disclosure workflows","Developers building tools that need real-time UI feedback"],"limitations":["State updates are sent as discrete messages; no built-in batching or debouncing","Client-side state is ephemeral; not persisted across conversation turns without server management","Complex state management logic must be implemented server-side; no client-side state machine support","Update latency depends on network round-trip time between server and client"],"requires":["MCP server with Apps extension support","Client that supports reactive UI updates","Server-side logic to manage and send state updates","Understanding of MCP message protocol"],"input_types":["UI state update messages","Field value changes","Visibility and enable/disable flags"],"output_types":["Updated UI components in client","Reactive changes to form fields and displays","Visual feedback to users"],"categories":["tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-modelcontextprotocolext-apps__cap_4","uri":"capability://tool.use.integration.mcp.protocol.extension.and.client.capability.negotiation","name":"mcp protocol extension and client capability negotiation","description":"Implements the MCP protocol extension mechanism that allows servers to advertise UI capabilities and clients to declare support for the Apps extension. Uses capability negotiation during the MCP initialization handshake to ensure both server and client support UI features before attempting to render interactive components, preventing errors when clients don't support the extension.","intents":["I want to check if the client supports UI rendering before sending UI components","I need to gracefully degrade to text-only responses if the client doesn't support the Apps extension","I want to advertise my server's UI capabilities during the MCP handshake"],"best_for":["MCP server developers building tools that work across multiple clients","Teams that need backward compatibility with non-UI-supporting clients","Developers implementing protocol extensions"],"limitations":["Capability negotiation happens once during initialization; runtime capability changes not supported","Clients may report support but have incomplete or buggy implementations","No versioning mechanism for UI schema versions; breaking changes require protocol version bumps","Fallback to text-only responses requires manual implementation in server code"],"requires":["MCP server implementation","Understanding of MCP initialization protocol","Client that implements capability negotiation","Fallback UI logic for non-supporting clients"],"input_types":["MCP initialization messages","Client capability declarations","Server capability advertisements"],"output_types":["Capability negotiation results","Boolean flags indicating UI support","Protocol version information"],"categories":["tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-modelcontextprotocolext-apps__cap_5","uri":"capability://tool.use.integration.conversational.ui.context.preservation.across.turns","name":"conversational ui context preservation across turns","description":"Manages UI context and state across multiple conversation turns by allowing servers to maintain references to previously rendered UI components and update them based on new user messages. Servers can track which UI elements were shown, what data was submitted, and how to evolve the UI as the conversation progresses, enabling coherent multi-turn interactions.","intents":["I want to show a form, process the submission, and then show updated results in the same UI context","I need to maintain a running list of user actions and update the UI as the conversation progresses","I want to build a conversational workflow where each turn builds on previous interactions"],"best_for":["MCP server developers building multi-turn conversational workflows","Teams creating stateful conversational experiences","Developers building task-oriented dialogue systems"],"limitations":["Context preservation requires explicit server-side state management; no automatic persistence","Conversation history is not automatically available; servers must track relevant context","UI updates across turns may create visual discontinuities if not carefully managed","Large conversation histories can increase message size and latency"],"requires":["MCP server with state management capability","Conversation history tracking (server-side or via MCP context)","Logic to map conversation turns to UI updates","Client that preserves UI context across turns"],"input_types":["Conversation messages","Previous UI state references","User interactions from prior turns"],"output_types":["Updated UI components","Preserved UI context","State transitions across turns"],"categories":["tool-use-integration","memory-knowledge"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-modelcontextprotocolext-apps__cap_6","uri":"capability://tool.use.integration.rich.data.display.and.visualization.components","name":"rich data display and visualization components","description":"Provides UI components for displaying structured data, tables, lists, and formatted text that render richly in conversational clients. Servers can format data for display using predefined component types (tables, code blocks, formatted lists) that clients render with appropriate styling and layout, improving readability compared to plain text output.","intents":["I want to display tabular data in a readable format within the conversation","I need to show formatted code or structured data with syntax highlighting","I want to present lists or hierarchical data in a visually organized way"],"best_for":["MCP server developers building data analysis or reporting tools","Teams creating tools that output structured results","Developers building dashboards or monitoring tools"],"limitations":["Display components are limited to predefined types; custom visualizations not supported","Large datasets may not render efficiently; pagination or truncation may be required","Styling is controlled by the client; servers cannot customize appearance beyond component type","Interactive features (sorting, filtering) must be implemented as separate UI components, not built into display components"],"requires":["MCP server with Apps extension","Data formatted according to component schema","Client that supports rich display components","Understanding of component types and their constraints"],"input_types":["Structured data (JSON objects, arrays)","Formatted text and code","Tabular data"],"output_types":["Rendered tables, lists, and formatted displays","Styled code blocks","Hierarchical data visualizations"],"categories":["tool-use-integration","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-modelcontextprotocolext-apps__cap_7","uri":"capability://tool.use.integration.button.and.action.component.integration","name":"button and action component integration","description":"Enables servers to define clickable buttons and action components that trigger server-side handlers when clicked. Buttons can be configured with labels, icons, and action types, and when clicked, send messages back to the server that invoke corresponding handler functions, enabling direct user-driven interactions without requiring form submissions.","intents":["I want to add a button that triggers an action when clicked","I need to provide quick-action buttons for common operations","I want to build a UI with multiple action buttons that each invoke different server functions"],"best_for":["MCP server developers building action-oriented tools","Teams creating quick-action interfaces","Developers building tools with simple, direct interactions"],"limitations":["Buttons send simple action messages; complex data cannot be passed through button clicks","No built-in confirmation dialogs; destructive actions require manual confirmation logic","Button state (disabled, loading) must be managed server-side through UI updates","No support for button groups or complex button layouts; buttons are rendered individually"],"requires":["MCP server with Apps extension","Handler functions to process button clicks","Client that supports button rendering","Understanding of action message format"],"input_types":["Button definitions with labels and action types","Action messages from button clicks"],"output_types":["Rendered buttons in UI","Action invocations on server","Results of button actions"],"categories":["tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-modelcontextprotocolext-apps__cap_8","uri":"capability://tool.use.integration.error.handling.and.user.feedback.messaging","name":"error handling and user feedback messaging","description":"Provides mechanisms for servers to send error messages, warnings, and informational feedback to users through the UI layer. Servers can display validation errors, operation failures, or status messages that render appropriately in the client (e.g., error dialogs, inline validation messages), improving user experience by providing clear feedback on server-side operations.","intents":["I want to show validation errors to users when form submission fails","I need to display error messages when server operations fail","I want to provide status updates and informational messages to users"],"best_for":["MCP server developers building user-facing tools","Teams that need clear error communication","Developers building tools with complex validation logic"],"limitations":["Error messages are text-based; no support for rich error formatting or error codes","No built-in error recovery suggestions; servers must provide actionable error messages","Error state is not persisted; errors must be re-sent if UI is refreshed","Limited control over error presentation; client determines how errors are displayed"],"requires":["MCP server with Apps extension","Error message formatting logic","Client that supports error message display","Understanding of error message types and severity levels"],"input_types":["Error messages from server operations","Validation error details","Status and informational messages"],"output_types":["Displayed error messages in UI","Validation error indicators","Status notifications"],"categories":["tool-use-integration","safety-moderation"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-modelcontextprotocolext-apps__cap_9","uri":"capability://code.generation.editing.mcp.server.implementation.patterns.and.examples","name":"mcp server implementation patterns and examples","description":"Provides TypeScript/JavaScript patterns, utilities, and example implementations for building MCP servers with UI support. Includes base classes, middleware, and helper functions that simplify common tasks like defining tools with UI, handling form submissions, and managing state, reducing boilerplate and accelerating development of UI-enabled MCP servers.","intents":["I want to quickly build an MCP server with UI support without writing boilerplate","I need examples of how to structure UI-enabled tools","I want to understand best practices for MCP server development with the Apps extension"],"best_for":["TypeScript/JavaScript developers new to MCP","Teams building multiple MCP servers with UI","Developers who want to follow established patterns"],"limitations":["Examples may not cover all use cases; custom implementations may be needed","Patterns are opinionated; alternative architectures may be more suitable for specific needs","Documentation quality depends on example completeness and clarity","Patterns may become outdated as the MCP protocol evolves"],"requires":["TypeScript 4.7+ or JavaScript","Node.js 16+","@modelcontextprotocol/sdk","Familiarity with async/await and TypeScript generics"],"input_types":["Example code and patterns","Documentation and guides"],"output_types":["Boilerplate-reduced server implementations","Structured code following best practices","Working examples"],"categories":["code-generation-editing","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0}],"trust":{"score":26,"verified":false,"data_access_risk":"high","permissions":["Node.js 16+ or compatible JavaScript runtime","@modelcontextprotocol/sdk package for base MCP functionality","MCP client that supports the Apps extension (e.g., Claude desktop client with UI support enabled)","Understanding of MCP protocol and server implementation patterns","TypeScript 4.7+ or JavaScript with JSDoc type annotations","@modelcontextprotocol/sdk installed","Node.js 16+","Familiarity with JSON schema syntax","MCP server implementation with Apps extension support","Client that supports form rendering (e.g., Claude with UI extension)"],"failure_modes":["UI rendering depends on client support — not all MCP clients implement the UI extension","Limited to UI patterns that can be expressed in the MCP Apps schema; custom JavaScript or advanced CSS not supported","No built-in state persistence across conversation turns — UI state must be managed by the server","Client-side rendering capabilities vary; complex layouts may degrade on resource-constrained clients","TypeScript-first design; JavaScript usage requires manual type annotations or JSDoc","Schema validation adds ~5-10ms overhead per UI render call","Limited to UI patterns expressible in JSON schema; no support for custom component types beyond the spec","No visual builder or drag-and-drop UI designer; all UI definition is code-based","Form validation is declarative only; complex conditional validation logic must be implemented server-side","No built-in file upload support; file handling requires custom implementation","builder identity is not verified yet","no observed match outcomes yet"],"rank_breakdown":{"adoption":0.05,"quality":0.3,"ecosystem":0.3,"match_graph":0.25,"freshness":0.6,"weights":{"adoption":0.25,"quality":0.25,"ecosystem":0.15,"match_graph":0.23,"freshness":0.12}},"observed_outcomes":{"matches":0,"success_rate":0,"avg_confidence":0,"top_intents":[],"last_matched_at":null},"maintenance":{"status":"active","updated_at":"2026-05-24T12:16:23.904Z","last_scraped_at":"2026-05-03T14:23:40.663Z","last_commit":null},"community":{"stars":null,"forks":null,"weekly_downloads":null,"model_downloads":null,"model_likes":null}},"distribution":{"claim_url":"https://unfragile.ai/submit?claim=npm-modelcontextprotocolext-apps","compare_url":"https://unfragile.ai/compare?artifact=npm-modelcontextprotocolext-apps"}},"signature":"ZDFcrg69QOmrhciEnCN6X0ULWt0IYZc25rhqO6y2vOgF6ORW+4rY/nuc3N8m5YoqrU34h0HB1tQX0smSO5hYDQ==","signedAt":"2026-06-21T06:15:00.057Z","signedBy":"unfragile.ai","version":1},"_links":{"self":"https://unfragile.ai/api/v1/passport/npm-modelcontextprotocolext-apps","artifact":"https://unfragile.ai/npm-modelcontextprotocolext-apps","verify":"https://unfragile.ai/api/v1/verify?slug=npm-modelcontextprotocolext-apps","publicKey":"https://unfragile.ai/api/v1/trust-passport-public-key","spec":"https://unfragile.ai/trust","schema":"https://unfragile.ai/schema.json","docs":"https://unfragile.ai/docs"}}