[goose2] MCP Apps: hydrate and replay app payloads in Goose2 (#8632)

Signed-off-by: Andrew Harvard <aharvard@squareup.com>

ui/sdk/src/mcp-apps.ts

@@ -2,7 +2,17 @@ import type {
   Implementation,
   InitializeRequest,
 } from "@agentclientprotocol/sdk";
-import { RESOURCE_MIME_TYPE } from "@modelcontextprotocol/ext-apps";
+import { RESOURCE_MIME_TYPE } from "@modelcontextprotocol/ext-apps/app-bridge";
+import type {
+  McpUiAppResourceConfig,
+  McpUiAppToolConfig,
+} from "@modelcontextprotocol/ext-apps/server";
+import type {
+  BlobResourceContents,
+  ReadResourceResult,
+  TextResourceContents,
+  Tool,
+} from "@modelcontextprotocol/sdk/types.js";
 
 export const GOOSE_MCP_UI_EXTENSION_ID = "io.modelcontextprotocol/ui" as const;
 
@@ -14,6 +24,50 @@ export interface GooseMcpHostCapabilities {
   extensions: Record<string, GooseMcpUiExtensionSettings>;
 }
 
+export type GooseToolUiMetadata = Extract<
+  McpUiAppToolConfig["_meta"],
+  { ui: unknown }
+>["ui"];
+
+export type GooseToolMetadata = NonNullable<Tool["_meta"]> & {
+  ui?: GooseToolUiMetadata;
+  goose_extension?: string;
+};
+
+export type GooseSessionTool = Tool & {
+  meta?: GooseToolMetadata;
+  _meta?: GooseToolMetadata;
+};
+
+export type GooseTextResourceContents = TextResourceContents;
+
+export type GooseBlobResourceContents = BlobResourceContents;
+
+export type GooseResourceContents = TextResourceContents | BlobResourceContents;
+
+export type GooseReadResourceResult = ReadResourceResult;
+
+export type GooseResourceMetadata = NonNullable<
+  Extract<NonNullable<McpUiAppResourceConfig["_meta"]>, { ui?: unknown }>["ui"]
+>;
+
+export interface GooseMcpAppToolPayload {
+  toolName: string;
+  extensionName: string;
+  resourceUri: string;
+  toolMeta?: GooseToolMetadata;
+  resourceResult?: GooseReadResourceResult | null;
+  readError?: string;
+}
+
+export interface GooseToolCallUpdateMeta {
+  goose?: {
+    mcpApp?: GooseMcpAppToolPayload;
+    [key: string]: unknown;
+  };
+  [key: string]: unknown;
+}
+
 export interface GooseClientMeta {
   goose: {
     mcpHostCapabilities: GooseMcpHostCapabilities;