Updated the return type of functions and related code from `string` to `any` to improve flexibility and support more diverse outputs. Adjusted function implementations, signatures, and handling of results accordingly.
Previously, OpenAI messages containing both `Content` and `MultiContent` could cause inconsistent behavior. This update ensures `Content` is converted into a `MultiContent` entry to maintain compatibility.
Previously, execution errors were only returned in the refusal field. This update appends errors to the result field if present, ensuring they are included in the tool's output. This change improves visibility and clarity for error reporting.
