test: isolate optional SDK role dependencies

src/app-bridge.ts

@@ -89,8 +89,8 @@ import {
   McpUiToolMeta,
 } from "./types";
 export * from "./types";
-export { RESOURCE_URI_META_KEY, RESOURCE_MIME_TYPE } from "./app";
-import { RESOURCE_URI_META_KEY } from "./app";
+export { RESOURCE_URI_META_KEY, RESOURCE_MIME_TYPE } from "./constants";
+import { RESOURCE_URI_META_KEY } from "./constants";
 export { PostMessageTransport } from "./message-transport";
 
 /**

src/app.ts

@@ -22,6 +22,7 @@ import {
   type Transport,
 } from "@modelcontextprotocol/client";
 import { EmptyResultSchema } from "@modelcontextprotocol/core";
+export { RESOURCE_MIME_TYPE, RESOURCE_URI_META_KEY } from "./constants";
 import { EventDispatcher } from "./events";
 export { EventDispatcher } from "./events";
 import { PostMessageTransport } from "./message-transport";
@@ -158,7 +159,6 @@ export {
  * }
  * ```
  */
-export const RESOURCE_URI_META_KEY = "ui/resourceUri";
 
 /**
  * MIME type for MCP UI resources.
@@ -167,7 +167,6 @@ export const RESOURCE_URI_META_KEY = "ui/resourceUri";
  *
  * Used by {@link server-helpers!registerAppResource `registerAppResource`} as the default MIME type for app resources.
  */
-export const RESOURCE_MIME_TYPE = "text/html;profile=mcp-app";
 
 /**
  * Options for configuring {@link App `App`} behavior.

src/constants.ts

@@ -0,0 +1,5 @@
+/** Legacy metadata key associating an MCP tool with its App resource. */
+export const RESOURCE_URI_META_KEY = "ui/resourceUri";
+
+/** MIME type for MCP App HTML resources. */
+export const RESOURCE_MIME_TYPE = "text/html;profile=mcp-app";

src/core-types.ts

@@ -0,0 +1,20 @@
+import {
+  CallToolResultSchema,
+  ContentBlockSchema,
+  EmbeddedResourceSchema,
+  ImplementationSchema,
+  RequestIdSchema,
+  ResourceLinkSchema,
+  ToolSchema,
+} from "@modelcontextprotocol/core";
+import type { z } from "zod/v4";
+
+// Infer shared wire types from the public role-neutral schemas so declarations
+// used by every entrypoint do not acquire a client or server package edge.
+export type CallToolResult = z.infer<typeof CallToolResultSchema>;
+export type ContentBlock = z.infer<typeof ContentBlockSchema>;
+export type EmbeddedResource = z.infer<typeof EmbeddedResourceSchema>;
+export type Implementation = z.infer<typeof ImplementationSchema>;
+export type RequestId = z.infer<typeof RequestIdSchema>;
+export type ResourceLink = z.infer<typeof ResourceLinkSchema>;
+export type Tool = z.infer<typeof ToolSchema>;

src/server/index.ts

@@ -32,13 +32,12 @@
  */
 
 import {
-  RESOURCE_URI_META_KEY,
-  RESOURCE_MIME_TYPE,
   McpUiResourceCsp,
   McpUiResourceMeta,
   McpUiToolMeta,
   McpUiClientCapabilities,
-} from "../app.js";
+} from "../spec.types.js";
+import { RESOURCE_URI_META_KEY, RESOURCE_MIME_TYPE } from "../constants.js";
 import type {
   ClientCapabilities,
   McpServer,

src/spec.types.ts

@@ -18,7 +18,7 @@ import type {
   RequestId,
   ResourceLink,
   Tool,
-} from "@modelcontextprotocol/client";
+} from "./core-types";
 
 /**
  * Current protocol version supported by this SDK.