diff --git a/autogpt_platform/backend/backend/copilot/sdk/tool_adapter.py b/autogpt_platform/backend/backend/copilot/sdk/tool_adapter.py
index c3eb10bd13..61b845822c 100644
--- a/autogpt_platform/backend/backend/copilot/sdk/tool_adapter.py
+++ b/autogpt_platform/backend/backend/copilot/sdk/tool_adapter.py
@@ -63,8 +63,10 @@ if TYPE_CHECKING:
 
 logger = logging.getLogger(__name__)
 
-# Max MCP response size in chars — keeps tool output under the SDK's 10 MB JSON buffer.
-_MCP_MAX_CHARS = 500_000
+# Max MCP response size in chars.  Lower = smaller context = cheaper.
+# 100K chars ≈ 25K tokens.  The SDK writes oversized results to
+# tool-results/ files and returns a file reference instead.
+_MCP_MAX_CHARS = 100_000
 
 # MCP server naming - the SDK prefixes tool names as "mcp__{server_name}__{tool}"
 MCP_SERVER_NAME = "copilot"