What is the final message (string input) generated from chat.completions

There is no ‘hole’ to be patched. The AI will be made to do whatever a determined person wants, including repeating anything in context.

Here’s that function language as it is received by the AI, as part of the first system part message.

Parallel tool calls are by an additional tool called multi_tool_use, that wastes more tokens, and tells the AI to place multiple functions in the tool wrapper, and later models are trained to use these.