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* feat(community): migrate You.com tools to async HTTP The You.com provider sent its search request through a sync httpx.Client. A sync LangChain tool invoked through ainvoke runs on the default executor, so the request held one of that pool's threads for the whole network round-trip, and several providers queried in parallel queued behind each other. Make the tool a coroutine over httpx.AsyncClient, resolve the API key and the configured max_results in a single config read, and move both disk reads off the event loop: the tool config, and the User-Agent, which reads the installed package metadata the first time it is needed. * refactor(community): drop the dead You.com API key wrapper The async migration resolved the key and max_results through _resolve_tool_settings, which left _get_api_key with no production caller: only TestGetApiKey still exercised it. Keeping a second seam around the same config read lets it drift from the real call path, so drop the wrapper and point the tests at _resolve_tool_settings. Also keep the hot path off the executor: _user_agent is cached, so only the first call reads the installed package metadata. Later calls are in-memory hits and now skip the to_thread round-trip. Finally, record which httpx client factory the provider reaches for in the runtime anchor. MockTransport runs its handler on the calling thread without real blocking I/O, so a provider that stayed async but sent the request through a sync client would satisfy the thread assertion; the recorded factory is what catches that partial regression. * test(community): align You.com URL safety stub with async tool The URL safety matrix still patched the removed _get_api_key seam and invoked the You.com tool synchronously. Mock the awaited search with AsyncMock and call the tool through ainvoke so URL screening remains covered after the async migration. --------- Co-authored-by: treasuresyq <309743290+treasuresyq@users.noreply.github.com> Co-authored-by: Willem Jiang <willem.jiang@gmail.com>