[Feature Request]: Disable Max_token by default

[writinwaters]

Is there an existing issue for the same feature request?

• [x] I have checked the existing issues.

Is your feature request related to a problem?

Describe the feature you'd like

Please disable max_tokens in chat assistant settings and agent settings. This has created lots of confusion.

BTW, in chat assistant settings, the default value is 512; in agent settings, the default value is 256. Is there a rationale behind this?

Describe implementation you've considered

No response

Documentation, adoption, use case

Additional information

No response