Type Alias AppOptions

AppOptions: ProtocolOptions & {
    allowUnsafeEval?: boolean;
    autoResize?: boolean;
    strict?: boolean;
}

Options for configuring App behavior.

Extends ProtocolOptions from the MCP SDK with App-specific configuration.

Type Declaration

OptionalallowUnsafeEval?: boolean
Allow code paths that require CSP unsafe-eval (e.g. new Function()).

Views typically run under a strict CSP without unsafe-eval. Zod's JIT object parser uses new Function() and throws on the first message parse under such a policy. By default (allowUnsafeEval: false) the App constructor sets z.config({ jitless: true }) so the SDK works out of the box under the spec's default CSP. Set allowUnsafeEval: true to skip that and keep the faster JIT path when the host's CSP permits unsafe-eval.
Default
```
false
```
OptionalautoResize?: boolean
Automatically report size changes to the host using ResizeObserver.

When enabled, the App monitors document.body and document.documentElement for size changes and automatically sends ui/notifications/size-changed notifications to the host.
Default
```
true
```
Optionalstrict?: boolean
Throw on detected misuse instead of logging a console warning.

Currently this affects calling host-bound methods (e.g. callServerTool, sendMessage) before connect has completed the ui/initialize handshake. With strict: false (default) a console.warn is emitted; with strict: true an Error is thrown.
Remarks
Throwing will become the default in a future release.
Default
```
false
```

See

ProtocolOptions from @modelcontextprotocol/sdk for inherited options