Missing tool and tool exception handling

[brianantonelli]

Issue number: #250

Summary

Missing tools should return a message that a requested tool was not found. Tools that throw exceptions should be properly caught and returned.

Changes

_process_tool in tools.py will raise exceptions for missing tools and tool invocation exceptions. tool_handler will catch these exceptions and report them back.

User experience

It works.

Checklist

If your change doesn't seem to apply, please leave them unchecked.

• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

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