Fixing base llm config for anthropic

[vilas1999]

Description

When using anthropic LLM, the default configuration sets both temperature and top_p. However, this LLM API call fails with exception

anthropic.BadRequestError: Error code: 400 - {'type': 'error', 'error': {'type': 'invalid_request_error', 'message': '`temperature` and `top_p` cannot both be specified for this model. Please use only one.'},

Hence setting the default value as None for both temperature and top_p

Fixes # 3730

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Refactor (does not change functionality, e.g. code style improvements, linting)
• [ ] Documentation update

How Has This Been Tested?

Able to execute the code attached in issue with this fix and provides below output:

Added first memory.

--- Retrieving Memories ---

Searching for: 'What is my name and what do I do for work?'
{'results': [{'id': '70963f93-2cc5-4f67-be48-b47ee57e5ca7', 'memory': 'Name is John', 'hash': 'b411f2405087835e4ecef41b42f3f901', 'metadata': None, 'score': 0.5285094683899707, 'created_at': '2025-11-07T22:58:09.162766-08:00', 'updated_at': None, 'user_id': 'local-dev-user-123'}, {'id': 'a071bf47-c9dd-4a35-80a4-568f8abaad0b', 'memory': 'Is a software developer', 'hash': '62168cb21e558338c23fa7673637e358', 'metadata': None, 'score': 0.5033015147920743, 'created_at': '2025-11-07T22:58:09.164146-08:00', 'updated_at': None, 'user_id': 'local-dev-user-123'}]}

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

Please delete options that are not relevant.

• [ ] Unit Test
• [x] Test Script (attached in the issue)

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules
• [ ] I have checked my code and corrected any misspellings

Maintainer Checklist

• [ ] closes #xxxx (Replace xxxx with the GitHub issue number)
• [ ] Made sure Checks passed

[CLAassistant]

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