Added default mcp tool call timeout from env

.changeset/perky-sloths-say.md

@@ -0,0 +1,5 @@
+---
+'@modelcontextprotocol/core': minor
+---
+
+Added ability to set mcp tool call timeout for the client from an env - keeping the fallback of 60_000

docs/client.md

@@ -539,7 +539,7 @@ client.onclose = () => {
 
 ### Timeouts
 
-All requests have a 60-second default timeout. Pass a custom `timeout` in the options to override it. On timeout, the SDK sends a cancellation notification to the server and rejects the promise with {@linkcode @modelcontextprotocol/client!index.SdkErrorCode.RequestTimeout | SdkErrorCode.RequestTimeout}:
+All requests have a 60-second default timeout. You can override it globally by setting the `MCP_TOOL_CALL_MCP_REQUEST_TIMEOUT_MSEC` environment variable, or pass a custom `timeout` in the options per request. On timeout, the SDK sends a cancellation notification to the server and rejects the promise with {@linkcode @modelcontextprotocol/client!index.SdkErrorCode.RequestTimeout | SdkErrorCode.RequestTimeout}:
 
 ```ts source="../examples/client/src/clientGuide.examples.ts#errorHandling_timeout"
 try {

packages/core/src/shared/protocol.ts

@@ -96,8 +96,17 @@ export type ProtocolOptions = {
 
 /**
  * The default request timeout, in milliseconds.
+ *
+ * Can be overridden via the `MCP_TOOL_CALL_MCP_REQUEST_TIMEOUT_MSEC` environment variable.
  */
-export const DEFAULT_REQUEST_TIMEOUT_MSEC = 60_000;
+export const DEFAULT_REQUEST_TIMEOUT_MSEC = (() => {
+    try {
+        const envValue = Number.parseInt(process.env.MCP_TOOL_CALL_MCP_REQUEST_TIMEOUT_MSEC ?? '', 10);
+        return envValue > 0 ? envValue : 60_000;
+    } catch {
+        return 60_000;
+    }
+})();
 
 /**
  * Options that can be given per request.