@modelcontextprotocol/ext-apps - v0.4.0
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    Variable OPEN_LINK_METHODConst

    OPEN_LINK_METHOD: McpUiOpenLinkRequest["method"] = "ui/open-link"

    Method string constants for MCP Apps protocol messages.

    These constants provide a type-safe way to check message methods without accessing internal Zod schema properties. External libraries should use these constants instead of accessing schema.shape.method._def.values[0].

    import { SANDBOX_PROXY_READY_METHOD } from '@modelcontextprotocol/ext-apps';

    if (event.data.method === SANDBOX_PROXY_READY_METHOD) {
    // Handle sandbox proxy ready notification
    }