From f397783c398857d38963c39642258afdcac7c1ec Mon Sep 17 00:00:00 2001
From: Jay Hemnani <jay.hemnani@sjsu.edu>
Date: Tue, 6 Jan 2026 12:11:36 -0800
Subject: [PATCH] fix: add explicit type annotation for call_tool decorator
 (#1826)

Co-authored-by: Jay Hemnani <jayhemnani9910@gmail.com>
Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>
---
 src/mcp/server/lowlevel/server.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/mcp/server/lowlevel/server.py b/src/mcp/server/lowlevel/server.py
index 3fc2d497..7c516964 100644
--- a/src/mcp/server/lowlevel/server.py
+++ b/src/mcp/server/lowlevel/server.py
@@ -499,7 +499,7 @@ class Server(Generic[LifespanResultT, RequestT]):
 
         def decorator(
             func: Callable[
-                ...,
+                [str, dict[str, Any]],
                 Awaitable[
                     UnstructuredContent
                     | StructuredContent