Non-success streams get forwarded to the MCP API

PSU 2026.1.6

If you provide an MCP tool and the script it's based on has Debug output for example, that output gets forwaded to the agent and from the agent to the user. So now both Anthropic and the user have the debug output that is only supposed to be read by me and my team. This is highly problematic if there were to be confidential info in that output.

Example output from VSC Claude Sonnet 4.5

Debug - Request URL: REDACTED
Debug - Request Method: GET
Debug - Request Body: REDACTED
Debug - Response StatusCode: 200
Debug - Response Content: 

Information - REDACTED

What is marked as the "Information" stream is the actual ouput from the success stream (the success stream is marked wrong, but that "bug" is not new)