use compatibility type rather than type assertion

Author: evalstate

packages/mcp-client/src/McpClient.ts

@@ -16,7 +16,6 @@ import type { Transport } from "@modelcontextprotocol/sdk/shared/transport";
 import { SSEClientTransport } from "@modelcontextprotocol/sdk/client/sse.js";
 import { StreamableHTTPClientTransport } from "@modelcontextprotocol/sdk/client/streamableHttp.js";
 import { ResultFormatter } from "./ResultFormatter.js";
-import type { CallToolResult } from "@modelcontextprotocol/sdk/types";
 
 type ToolName = string;
 
@@ -198,7 +197,7 @@ export class McpClient {
 			const client = this.clients.get(toolName);
 			if (client) {
 				const result = await client.callTool({ name: toolName, arguments: toolArgs, signal: opts.abortSignal });
-				toolMessage.content = ResultFormatter.format(result as CallToolResult);
+				toolMessage.content = ResultFormatter.format(result);
 			} else {
 				toolMessage.content = `Error: No session found for tool: ${toolName}`;
 			}

packages/mcp-client/src/ResultFormatter.ts

@@ -1,4 +1,8 @@
-import type { CallToolResult, TextResourceContents, BlobResourceContents } from "@modelcontextprotocol/sdk/types";
+import type {
+	TextResourceContents,
+	BlobResourceContents,
+	CompatibilityCallToolResult,
+} from "@modelcontextprotocol/sdk/types";
 
 /**
  * A utility class for formatting CallToolResult contents into human-readable text.
@@ -13,7 +17,7 @@ export class ResultFormatter {
 	 * @param result The CallToolResult to format
 	 * @returns A human-readable string representation of the result contents
 	 */
-	static format(result: CallToolResult): string {
+	static format(result: CompatibilityCallToolResult): string {
 		if (!result.content || !Array.isArray(result.content) || result.content.length === 0) {
 			return "[No content]";
 		}