From 9c2c4f9586650e5bcc77967a617ca82e708c92d5 Mon Sep 17 00:00:00 2001
From: asechi_tadaki <asechi_tadaki@infordio.co.jp>
Date: Mon, 29 Sep 2025 19:39:52 +0900
Subject: [PATCH] fix(rest): send historyLength=0 when history_length=0 (avoid
 falsy omission)

---
 src/a2a/client/transports/rest.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/a2a/client/transports/rest.py b/src/a2a/client/transports/rest.py
index 082c21cc8..eef7b0f2e 100644
--- a/src/a2a/client/transports/rest.py
+++ b/src/a2a/client/transports/rest.py
@@ -214,7 +214,7 @@ async def get_task(
         response_data = await self._send_get_request(
             f'/v1/tasks/{request.id}',
             {'historyLength': str(request.history_length)}
-            if request.history_length
+            if request.history_length is not None
             else {},
             modified_kwargs,
         )