mcpjam-agent: explicitly advertise io.modelcontextprotocol/ui capability (#2637)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: chelojimenez

mcpjam-inspector/server/routes/web/mcpjam-agent.ts

@@ -20,7 +20,12 @@
  */
 import { Hono } from "hono";
 import { z } from "zod";
-import { MCPClientManager, type HttpServerConfig } from "@mcpjam/sdk";
+import {
+  MCPClientManager,
+  type HttpServerConfig,
+  MCP_UI_EXTENSION_ID,
+  MCP_UI_RESOURCE_MIME_TYPE,
+} from "@mcpjam/sdk";
 import { isMCPAuthError } from "@mcpjam/sdk";
 import { WEB_STREAM_TIMEOUT_MS } from "../../config.js";
 import { INSPECTOR_MCP_RETRY_POLICY } from "../../utils/mcp-retry-policy.js";
@@ -88,6 +93,13 @@ mcpjamAgent.post("/", async (c) => {
     const docsConfig: HttpServerConfig = {
       url: docsUrl,
       timeout: 30_000,
+      clientCapabilities: {
+        extensions: {
+          [MCP_UI_EXTENSION_ID]: {
+            mimeTypes: [MCP_UI_RESOURCE_MIME_TYPE],
+          },
+        },
+      },
     };
 
     manager = new MCPClientManager(