Raise exception if max tokens exceeded #686
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I've seen a few issues reported that were resolved by raising max tokens. The aim of this PR is to avoid misleading error messages and report if tokens are exhausted. It also provides the ground work for stopping agent execution early if there are no tokens left as I believe that is an unrecoverable situation.
Currently the PR only applies to MLX models but should be easy to apply to other model types if the proposed solution is accepted. @aymeric-roucher can you take a quick look and let me know what you think?
Closes #607
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