tools require a filled description

[efriis]

Generally langchain tools default to having an empty string as a description. Some (maybe all) bedrock models require a filled description, which affects the ease of use of with_structured_output(method="function_calling") and bind_tools with ChatBedrock

In particular, this impacts model interoperability, where people are trying their tools with different models, and the bedrock versions simply fail.

Some ideas:

• populate the description with the same as the tool name by default in bedrock to avoid the error
• raise a more descriptive error to help people populate docstrings on their tool function/basemodel/etc

I'm probably more in favor of auto populating for models this impacts

cc @hinthornw

[3coins]

cc @patilvishal0597