Added ToolUser parameter system_prompt and verbosity #20
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What it does and Why
It is very convenient to have support for system prompts even when using function calling. In the current implementation, I couldn't find an easy way to supply a custom system prompt. Hence, I added a parameter for system_prompt on ToolUser, which simply inserts the user-specified system prompt in front of the system prompt generated for function calling. This produces a longer system prompt, but this did not negatively affect the function calling effectiveness of Claude 3 Opus during my personal testing.
For debugging purposes, I also added a verbosity flag that makes it easier to track the final system prompt.