It's not obvious how to override default max_tokens_to_sample

[rstrahan]

It is possible to override the default max_tokens_to_sample value (256) by adding a key to the model parameters.
The default model parameters output currently looks like: {"modelId": "anthropic.claude-instant-v1", "temperature": 0}

It is possible to add additional model parameters to this structure, but this max not be obvious to users..

request is to update the default to add max_tokens_to_sample explicitly - like this:
{"modelId": "anthropic.claude-instant-v1", "temperature": 0, "max_tokens_to_sample":256}

Making it more obvious that it can be modified.