diff --git a/apps/backend/core/client.py b/apps/backend/core/client.py
index 761cf2cf..69c9c0e2 100644
--- a/apps/backend/core/client.py
+++ b/apps/backend/core/client.py
@@ -796,6 +796,9 @@ def create_client(
         "settings": str(settings_file.resolve()),
         "env": sdk_env,  # Pass ANTHROPIC_BASE_URL etc. to subprocess
         "max_thinking_tokens": max_thinking_tokens,  # Extended thinking budget
+        "max_buffer_size": 10
+        * 1024
+        * 1024,  # 10MB buffer (default: 1MB) - fixes large tool results
         # Enable file checkpointing to track file read/write state across tool calls
         # This prevents "File has not been read yet" errors in recovery sessions
         "enable_file_checkpointing": True,