diff --git a/tools/server/server-task.cpp b/tools/server/server-task.cpp
index 45e5168fabe..e00362b9152 100644
--- a/tools/server/server-task.cpp
+++ b/tools/server/server-task.cpp
@@ -1375,7 +1375,7 @@ json server_task_result_cmpl_final::to_json_anthropic_stream() {
 //
 void server_task_result_cmpl_partial::update(task_result_state & state) {
     is_updated = true;
-    state.update_chat_msg(content, true, oaicompat_msg_diffs);
+    state.update_chat_msg(content, true, oaicompat_msg_diffs, /* filter_tool_calls= */ true);
 
     // Copy current state for use in to_json_*() (reflects state BEFORE this chunk)
     thinking_block_started = state.thinking_block_started;