Pass tool not available back to the model

[BeatrixCohere]

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AI Description

The _call_tool_async function in tool_calls.py has been updated to include additional logging and error handling when a custom chat tool is not included in the "tools" parameter.

• When a tool is not found in the AVAILABLE_TOOLS, the function now logs an info message with the event and error details.
• Instead of returning an empty list [], the function now constructs and returns a structured output with the call and outputs fields.