* feat: implement ui/notifications/tool-cancelled throughout SDK
Wire the tool-cancelled notification that hosts MUST send when tool
execution is cancelled (user action, timeout, classifier intervention, etc.):
- Add McpUiToolCancelledNotification type in spec.types.ts
- Generate Zod schema via ts-to-zod
- Add AppBridge.sendToolCancelled() method for hosts
- Add App.ontoolcancelled setter for guest UIs
- Export type and schema from types.ts
- Add tests for notification with/without reason
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
* feat: add App.onteardown handler for graceful shutdown
Wire the guest UI side of ui/resource-teardown request:
- Add onteardown setter in App class for guest UIs to handle teardown
- Allow ui/resource-teardown in assertRequestHandlerCapability
- Import McpUiResourceTeardownRequest/Result types
- Add tests for sync and async cleanup handlers
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Co-Authored-By: Claude <noreply@anthropic.com>
* feat(example): wire tool-cancelled and teardown in basic-host
Update basic-host example to properly use the new notifications:
- Send sendToolCancelled when tool call promise rejects
- Send sendResourceTeardown when React component unmounts
- Store appBridge ref for cleanup access
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Co-Authored-By: Claude <noreply@anthropic.com>
* fix(example): implement graceful teardown per spec recommendation
Address review feedback: the host now waits for guest's teardown
response before unmounting, following the spec: "Host SHOULD wait
for a response before tearing down the resource (to prevent data loss)."
Changes:
- Add close button to tool call panels
- Two-phase unmount: isDestroying state dims panel and disables events
- sendResourceTeardown() completes before component removal
- Non-app tool results close immediately
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Co-Authored-By: Claude <noreply@anthropic.com>
* feat(examples): add onteardown handlers to demo apps
Demonstrate graceful shutdown with simulated 500ms cleanup work.
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---------
Co-authored-by: Claude <noreply@anthropic.com>
Replace custom spawn-based orchestration with concurrently's API.
This fixes zombie processes on Ctrl+C - concurrently uses tree-kill
internally to properly terminate entire process trees.
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Co-authored-by: Claude <noreply@anthropic.com>
Interactive Wikipedia link graph visualization using force-graph with:
- Force-directed graph layout for exploring page connections
- Node expansion to reveal first-degree Wikipedia links
- Visual state tracking (blue=default, green=expanded, red=error)
- Direct browser access to Wikipedia pages
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Co-authored-by: Claude <noreply@anthropic.com>
- Fix RESOURCE_MIME_TYPE to match spec: "text/html;profile=mcp-app"
- Add CSP field to McpUiSandboxResourceReadyNotification type and schema
- Update basic-host to extract and pass CSP metadata from resources
- Update sandbox.ts to dynamically inject CSP meta tag into inner iframe
- Remove static CSP from sandbox.html (now dynamic based on resource metadata)
- Update QR server to use custom read_resource handler for _meta injection
- Update requirements.txt to require mcp[cli]>=1.23.3
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Co-authored-by: Claude <noreply@anthropic.com>
* Add QR code Python MCP server example
A minimal Python MCP server that generates customizable QR codes with an
interactive widget UI. Features:
- Generate QR codes from any text or URL
- Customizable colors, size, border, and error correction
- Interactive widget using MCP Apps SDK protocol
- Supports both HTTP (for web clients) and stdio (for Claude Desktop)
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Co-Authored-By: Claude <noreply@anthropic.com>
* Potential fix for code scanning alert no. 10: Client-side cross-site scripting
Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>
* Add semicolon
* Bind to 0.0.0.0 for Docker compatibility
* Use SDK from unpkg + add CSP resourceDomains for external scripts
---------
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>
* Restructure threejs-server README to match marketing examples
- Update title format to "Example: Three.js App"
- Constrain screenshot width using table layout
- Add Features section with key capabilities
- Reorganize Running section with Tool Input subsection
- Add Architecture section describing server and app components
- Remove implementation-focused sections (WidgetProps, Creating a New Widget)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
* Add bun as devDependency to example packages
npm install now automatically installs bun, eliminating the need for
separate installation instructions. Removed manual bun install step
from customer-segmentation-server README.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
* Add start:http and start:stdio npm scripts to examples
For the 6 examples supporting --stdio transport, add explicit scripts:
- serve:http / serve:stdio for running the server
- start:http / start:stdio for build + serve
- start now aliases to start:http for backward compatibility
Update READMEs to document both transport options.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
* Default basic-host SERVERS to localhost:3001/mcp
- Change threejs-server default port from 3109 to 3001 for consistency
- Add default SERVERS value in basic-host serve.ts
- Document SERVERS env var in basic-host README
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
* Improve Examples section in README
Frame the three basic examples as foundational starting points and
add a link to the examples directory for additional demo apps.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
---------
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Extract server dropdown into ServerSelect component and simplify
ToolCallInfoPanel to read server name from toolCallInfo.serverInfo.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Replace hardcoded port assignments and npm scripts with run-all.ts that:
- Auto-discovers example directories and assigns ports
- Passes server URLs to basic-host via SERVERS env var
- Supports start, dev, and build commands
Update basic-host to fetch server list from /api/servers endpoint
and display server names from MCP server metadata.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
New example demonstrating interactive 3D scene rendering with:
- show_threejs_scene tool with streaming code preview
- learn_threejs documentation tool
- Full WidgetProps interface for MCP App integration
- Reusable mcp-app-wrapper.tsx pattern
Also adds bun.lockb to .gitignore.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
* Add server selector to basic-host example
- Add ServerSelector component to switch between MCP servers
- Run all example servers concurrently on ports 3101-3107
- Update examples:start to launch all servers with assigned ports
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Co-Authored-By: Claude <noreply@anthropic.com>
* Move server selector into tool call panel
- Server selector now in same component as tool selector
- Tool call results persist across server switches
- Connection caching avoids reconnects when switching servers
- Display server name with tool name in results (ServerName:ToolName)
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Co-Authored-By: Claude <noreply@anthropic.com>
---------
Co-authored-by: Claude <noreply@anthropic.com>
Change onsizechange handler to use min-width instead of width,
treating the app's reported size as a floor rather than exact.
Use min(Xpx, 100%) to allow shrinking with container.
Also remove outmost max-width constraint and simplify iframe CSS to
allow apps to demonstrate responsive growing.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Change marketing widget containers from fixed 600px to width: 100%
- Update basic-host iframe to use flex: 1 for proper expansion
- Widgets now fill their parent container instead of fixed size
Files changed:
- examples/budget-allocator-server/src/mcp-app.css
- examples/customer-segmentation-server/src/mcp-app.css
- examples/scenario-modeler-server/src/mcp-app.css
- examples/system-monitor-server/src/mcp-app.css
- examples/basic-host/src/index.module.css
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
When launched with --stdio flag, servers use StdioServerTransport
instead of starting an HTTP server. This enables direct integration
with Claude Desktop and other MCP clients that use stdio transport.
Usage:
bun examples/budget-allocator-server/server.ts --stdio
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Not all MCP clients support structuredContent in MCP tool results, so
examples now return data as JSON in content and parse it client-side.
Pattern used:
- Server: content: [{ type: "text", text: JSON.stringify(data) }]
- Client: JSON.parse(result.content!.filter(...).map(...).join(""))
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Insert thumbnail galleries linking to full-size images hosted on
GitHub Pages for budget-allocator, cohort-heatmap, customer-segmentation,
scenario-modeler, and system-monitor server examples.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Apply MIME type change from commit 0af1532 to all examples and docs.
The profile parameter follows RFC 6838 recommendations for custom
media types, as MCP Apps is a profile of HTML rather than a new syntax.
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Co-Authored-By: Claude <noreply@anthropic.com>
Demo MCP App showcasing real-time OS metrics visualization with:
- Per-core CPU usage via stacked area chart (Chart.js)
- Memory usage bar gauge with color-coded thresholds
- Auto-polling at 2-second intervals
- Light/dark theme support
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These legacy examples have been replaced by basic-host,
basic-server-react, and basic-server-vanillajs.
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Co-Authored-By: Claude <noreply@anthropic.com>
Demonstrates MCP App SDK usage with vanilla JavaScript (no framework),
providing parity with the existing basic-server-react example.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Introduce new example implementations to replace simple-host and
simple-server:
- basic-host: Reference host implementation with double-iframe sandbox
pattern for secure UI isolation (outer iframe validates and relays
messages, inner iframe renders untrusted tool UI via srcdoc)
- basic-server-react: MCP server example demonstrating tool registration
with linked UI resources and React UI using the useApp() hook
Build infrastructure updates:
- Add build:all script and simplify CI/pre-commit to use it
- Add examples:dev for watch-mode development workflow
Also change PostMessageTransport logging from info to debug level.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Change MIME type from `text/html+mcp` to `text/html;profile=mcp-app`
to follow RFC 6838 recommendations for custom media types.
The `+suffix` format (like `text/html+mcp`) is intended for structured
syntax suffixes (e.g., `+json`, `+xml`) that describe the underlying
format. Since MCP Apps doesn't define a new syntax but rather a profile
of HTML, using a profile parameter is more semantically correct.
Fixes#59🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude <noreply@anthropic.com>
Replace Zod schema's internal _def.value access with a direct string
literal. The previous approach failed due to multiple Zod instances
being bundled, causing schema.shape.method._def.value to return
undefined.
The fix uses a typed string constant that provides compile-time safety
via McpUiSandboxProxyReadyNotification["method"] while avoiding runtime
dependency on Zod internals.
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Co-authored-by: Claude <noreply@anthropic.com>
