diff --git a/src/anthropic/lib/streaming/_beta_messages.py b/src/anthropic/lib/streaming/_beta_messages.py
index 9c4ca2bd4..060ed4aab 100644
--- a/src/anthropic/lib/streaming/_beta_messages.py
+++ b/src/anthropic/lib/streaming/_beta_messages.py
@@ -365,7 +365,7 @@ def build_events(
                     )
                 )
         elif event.delta.type == "input_json_delta":
-            if content_block.type == "tool_use" or content_block.type == "mcp_tool_use":
+            if content_block.type in ("tool_use", "mcp_tool_use", "server_tool_use"):
                 events_to_fire.append(
                     build(
                         BetaInputJsonEvent,
diff --git a/src/anthropic/lib/streaming/_messages.py b/src/anthropic/lib/streaming/_messages.py
index 5c0da9992..250953f03 100644
--- a/src/anthropic/lib/streaming/_messages.py
+++ b/src/anthropic/lib/streaming/_messages.py
@@ -360,7 +360,7 @@ def build_events(
                     )
                 )
         elif event.delta.type == "input_json_delta":
-            if content_block.type == "tool_use":
+            if content_block.type in ("tool_use", "server_tool_use"):
                 events_to_fire.append(
                     build(
                         InputJsonEvent,