diff --git a/src/agents/tatlock.py b/src/agents/tatlock.py
index e26a945..1c74175 100644
--- a/src/agents/tatlock.py
+++ b/src/agents/tatlock.py
@@ -587,16 +587,23 @@ class TatlockAgent(AgentInterface):
                     ModelResponse(parts=[TextPart(content=content)])
                 )
 
-        # Stream with scoped tools and tracker
-        async with scoped_agent.run_stream(
+        # Use run() instead of run_stream() to avoid Ollama 400 bug
+        # with streaming + tool calls (PydanticAI issues #1292, #2256)
+        # We yield the final response in chunks to maintain streaming interface
+        result = await scoped_agent.run(
             enriched_message,
             message_history=pydantic_history if pydantic_history else None,
             deps=tool_tracker
-        ) as stream:
-            async for chunk in stream.stream_text(delta=True):
-                yield chunk
+        )
 
-        logger.info("tatlock_stream_complete")
+        # Stream the final response in chunks to maintain UX
+        response_text = result.output
+        chunk_size = 50  # characters per chunk
+
+        for i in range(0, len(response_text), chunk_size):
+            yield response_text[i:i + chunk_size]
+
+        logger.info("tatlock_scoped_run_complete")
 
     async def get_capabilities(self) -> dict:
         """Return current capabilities."""