* Add a codex backtranslation example to improve SQL queries (openai#58)

* Add a codex backtranslation example to improve SQL queries

* Boris update ft example (openai#57)

* update fine-tune example to show the new CLI outputs

* model specifiction for search (openai#60)

* Catch chunked encoding errors and retry (openai#63)

* Add batch suggestion logic to prepare_data for fine_tunes and custom Q&A answers logic (openai#62)

* Add batch suggestion logic to prepare_data for fine_tunes; add an example of how to create a rudimentary answers endpoint with a custom Q&A model

Co-authored-by: Madeleine Thompson <madeleine@openai.com>
Co-authored-by: hallacy <hallacy@openai.com>

* Add a codex backtranslation example to improve SQL queries (openai#58)

* Add a codex backtranslation example to improve SQL queries

* Boris update ft example (openai#57)

* update fine-tune example to show the new CLI outputs

* model specifiction for search (openai#60)

* Catch chunked encoding errors and retry (openai#63)

* Add batch suggestion logic to prepare_data for fine_tunes and custom Q&A answers logic (openai#62)

* Add batch suggestion logic to prepare_data for fine_tunes; add an example of how to create a rudimentary answers endpoint with a custom Q&A model

Co-authored-by: Madeleine Thompson <madeleine@openai.com>
Co-authored-by: hallacy <hallacy@openai.com>

…enai#60)

This PR introduces a `strict_mode: bool = True` option to
`@function_tool`, allowing optional parameters when set to False. This
change enables more flexibility while maintaining strict JSON schema
validation by default.

resolves openai#43 

## Changes:

- Added `strict_mode` parameter to `@function_tool` and passed it to
`function_schema` and `FunctionTool`.
- Updated `function_schema.py` to respect `strict_mode` and allow
optional parameters when set to False.
- Added unit tests to verify optional parameters work correctly,
including multiple optional params with different types.

## Tests:

- Verified function calls with missing optional parameters behave as
expected.
- Added async tests to validate behavior under different configurations.