From f9bd1a37c7552a0df05fbac07f8e1990ae457347 Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Wed, 23 Sep 2026 14:26:40 +0000
Subject: [PATCH] fix(mcp): give the persistent session result cast a reason

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
---
 litellm/experimental_mcp_client/client.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/litellm/experimental_mcp_client/client.py b/litellm/experimental_mcp_client/client.py
index 91f9f160896..c79fe5dfae4 100644
--- a/litellm/experimental_mcp_client/client.py
+++ b/litellm/experimental_mcp_client/client.py
@@ -1248,7 +1248,7 @@ class PersistentMCPSession:
             raise RuntimeError("upstream MCP session closed")
         future: Final[asyncio.Future[object]] = asyncio.get_running_loop().create_future()
         await self._queue.put((operation, future))
-        return cast(TSessionResult, await future)
+        return cast(TSessionResult, await future)  # cast-ok: one queue serves operations of every result type
 
     def close(self) -> None:
         _ = self._task.cancel()