MCP Apps capabilities negotiation

types.ts

export type AppInitializeRequest = {
  method: "ui/initialize";
  params: {
    appCapabilities: AppCapabilities;
  };
};

export type AppInitializeResult = {
  hostCapabilities: AppHostCapabilities;
  hostContext: HostContext;
};

export type AppHostCapabilities = {
  experimental?: object,

  openLinks?: object,

  serverTools?: {
    listChanged?: boolean
  }
  serverResources?: {
    listChanged?: boolean
  }
  logging?: {
    listChanged?: boolean
  }
  // TODO: elicitation, sampling...
}

export type AppCapabilities = {
  // WebMCP-style tools exposed by the app to the host
  tools?: {
    listChanged?: boolean
  }
}