From b62f005307d7c022dddabd9c41755c73a84b118e Mon Sep 17 00:00:00 2001
From: Jeremiah Lowin <153965+jlowin@users.noreply.github.com>
Date: Fri, 25 Apr 2025 20:02:46 -0400
Subject: [PATCH] Update tools.mdx

---
 docs/servers/tools.mdx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/docs/servers/tools.mdx b/docs/servers/tools.mdx
index 71c24dfbe..2c4fb7370 100644
--- a/docs/servers/tools.mdx
+++ b/docs/servers/tools.mdx
@@ -205,6 +205,10 @@ FastMCP automatically converts the value returned by your function into the appr
 
 FastMCP will attempt to serialize other types to a string if possible.
 
+<Tip>
+At this time, FastMCP responds only to your tool's return *value*, not its return *annotation*.
+</Tip>
+
 ```python
 from fastmcp import FastMCP, Image
 import io