ActionFind.url is required but live find_in_page web_search_call items omit url

[SvenDH]

Confirm this is an issue with the Python library and not an underlying OpenAI API

• This is an issue with the Python library

The live Responses API can omit url on web_search_call actions of type find_in_page. The generated SDK type still requires it, so strict validation fails even though the API accepted/produced the item.

This is the same class of API/SDK drift as #2620 (open_page.url was required, API returned null) and the leftover gap after #2621 (find_in_page type was added, but url stayed required). Those were closed as fixed in v2.17.0. ActionFind.url is still str (required) on current main / v3.7.0.

Describe the bug

A completed hosted web search item can look like:

{
  "id": "ws_0c54d33c372e53...",
  "type": "web_search_call",
  "status": "completed",
  "action": {
    "type": "find_in_page",
    "pattern": "og:image"
  }
}

ResponseFunctionWebSearch / ActionFind rejects this because url is missing.

This is easy to miss on the live streaming path (items can be constructed more loosely, then dumped with exclude_unset=True). It then blows up when the payload is re-validated, in particular openai-agents RunState.from_json() → ModelResponse(...) on resume after a pause.

ActionOpenPage.url was correctly made optional. ActionFind.url was not.

To Reproduce

1. Run a Responses API / Agents SDK turn that uses hosted web_search and performs a find_in_page action. The API may omit action.url.
2. Serialize the run (RunState.to_json() / model_dump(exclude_unset=True)).
3. Restore with RunState.from_json() or ResponseFunctionWebSearch.model_validate(...).
4. Validation fails on action.ActionFind.url with Field required.

Minimal local reproduction below does not need a live API call.

Code snippets

from openai.types.responses.response_function_web_search import ResponseFunctionWebSearch

ResponseFunctionWebSearch.model_validate(
    {
        "id": "ws_redacted",
        "type": "web_search_call",
        "status": "completed",
        "action": {"type": "find_in_page", "pattern": "og:image"},
    }
)

Observed (openai 2.45.0; same required field on current main):

pydantic_core.ValidationError: ... validation errors for ResponseFunctionWebSearch
action.ActionFind.url
  Field required [type=missing, input_value={'type': 'find_in_page', 'pattern': 'og:image'}, input_type=dict]

Expected: either the API always includes url, or ActionFind.url is Optional[str] like ActionOpenPage.url.

OS

Linux

Python version

Python 3.13

Library version

openai v2.45.0 (also present on openai v3.7.0 / current main: ActionFind.url: str)
openai-agents v0.19.2 (restore path: RunState.from_json → ModelResponse)