From 2a65c0848e8815a50135ce266b515a46c36807f3 Mon Sep 17 00:00:00 2001
From: davenpi <davenport.ianc@gmail.com>
Date: Thu, 22 May 2025 17:52:39 -0400
Subject: [PATCH] Feat(client): add cancel notification method

---
 src/fastmcp/client/client.py | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/fastmcp/client/client.py b/src/fastmcp/client/client.py
index 19552ea35..f6333fb08 100644
--- a/src/fastmcp/client/client.py
+++ b/src/fastmcp/client/client.py
@@ -210,6 +210,23 @@ class Client:
         result = await self.session.send_ping()
         return isinstance(result, mcp.types.EmptyResult)
 
+    async def cancel(
+        self,
+        request_id: str | int,
+        reason: str | None = None,
+    ) -> None:
+        """Send a cancellation notification for an in-progress request."""
+        notification = mcp.types.ClientNotification(
+            mcp.types.CancelledNotification(
+                method="notifications/cancelled",
+                params=mcp.types.CancelledNotificationParams(
+                    requestId=request_id,
+                    reason=reason,
+                ),
+            )
+        )
+        await self.session.send_notification(notification)
+
     async def progress(
         self,
         progress_token: str | int,