From 5e019945f209ed98e7064f2c2bde5c117d91afc1 Mon Sep 17 00:00:00 2001
From: Justin Spahr-Summers <justin@anthropic.com>
Date: Mon, 25 Nov 2024 16:55:24 -0600
Subject: [PATCH] Fix TypeScript first server logging to stdout

---
 docs/first-server/typescript.mdx | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/docs/first-server/typescript.mdx b/docs/first-server/typescript.mdx
index e300b5d..18354ac 100644
--- a/docs/first-server/typescript.mdx
+++ b/docs/first-server/typescript.mdx
@@ -192,7 +192,10 @@ This guide uses the OpenWeatherMap API. You'll need a free API key from [OpenWea
       async run(): Promise<void> {
         const transport = new StdioServerTransport();
         await this.server.connect(transport);
-        console.log("Weather MCP server running on stdio");
+        
+        // Although this is just an informative message, we must log to stderr,
+        // to avoid interfering with MCP communication that happens on stdout
+        console.error("Weather MCP server running on stdio");
       }
     }