* 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
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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>
- 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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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>
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.
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Co-Authored-By: Claude Opus 4.5 <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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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.
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