fix(google_search): AsyncGoogleSearch.run drops k, so every successful search raises TypeError

[Anai-Guo]

The bug

AsyncGoogleSearch does not define _parse_results; it inherits it from GoogleSearch:

MRO: ['AsyncGoogleSearch', 'AsyncActionMixin', 'GoogleSearch', 'BaseAction', 'object']
owner    : GoogleSearch._parse_results
signature: (self, results: dict, k: int) -> Union[str, List[str]]

The synchronous path passes both arguments, the async path passes only one:

call site	code
GoogleSearch.run, google_search.py:72	parsed_res = self._parse_results(response, k)
AsyncGoogleSearch.run, google_search.py:199	parsed_res = self._parse_results(response)

k has no default, so every successful (HTTP 200) AsyncGoogleSearch call raises TypeError instead of returning results. The status_code == 200 branch is the only branch that reaches this line, so the async action never succeeds — the error paths (-1, other codes) are the only ones that return normally.

AsyncArxivSearch, the repo's other AsyncActionMixin search subclass, forwards its parameters correctly (return super().get_arxiv_article_information(query)), and all 16 self._parse_response(...) call sites in web_browser.py match their 1-argument definitions. AsyncGoogleSearch.run is the only mismatched site in lagent/.

The fix

One line — pass k, exactly as the synchronous sibling does.

Verification

Ran on the real module (loaded from lagent/actions/google_search.py, with _search stubbed to return (200, {...}) so no network/API key is needed), before and after the patch:

=== UNPATCHED (v1.0.0 @ faaf42b) ===
  TypeError raised out of AsyncGoogleSearch.run():
  GoogleSearch._parse_results() missing 1 required positional argument: 'k'

=== PATCHED ===
  state=0 (SUCCESS) errmsg=None
  result=[{'type': 'text', 'content': "['snippet-0', 'snippet-1', 'snippet-2']"}]

The patched run was driven with k=3 and returns exactly 3 snippets, so k is honoured rather than merely accepted.

Also replayed both call sites through inspect.Signature.bind against the real inherited signature:

sync  line 72 : bind OK
async line 199: bind FAILS: missing a required argument: 'k'

Base branch

Targeting v1.0.0 since that is where recent work has been merging (#365, #366, #367). The same line is identical on main — happy to retarget or open a companion PR if you would rather take it there.

🤖 Generated with Claude Code

[Anai-Guo]

Note on CI: the docs/readthedocs.org:lagent-cn check fails here, but that is pre-existing on the v1.0.0 base, not caused by this change — #368 (also based on v1.0.0, and touching no docs) shows the identical failure, while #370 and #371 (based on main) both pass the same check. This PR only edits lagent/actions/google_search.py and adds no docs.

🤖 Generated with Claude Code