While adding google-cloud-firestore as an optional dependency is a good step, please ensure that the corresponding utility that uses it handles the ImportError gracefully if the dependency is not installed. This is to prevent runtime errors for users who do not install the [firestore] extra. Based on other files in this library, it's likely this check is missing.

Making redis an optional dependency is the correct approach, but it introduces a runtime issue. The module src/google/adk_community/sessions/redis_session_service.py imports redis.asyncio at the top level without handling its potential absence. This will cause an ImportError for users who install the package without the [redis] extra. The code needs to be updated to handle this, for example by wrapping the import in a try...except ImportError block and raising a clear error if the RedisSessionService is used without redis being installed.

Making httpx an optional dependency is a good change. However, the module that uses it, src/google/adk_community/memory/open_memory_service.py, imports httpx unconditionally at the top level. This will cause an ImportError for users who install the package without the [openmemory] extra. The code should be updated to handle the case where httpx is not installed, for example by using a try...except ImportError block and raising an informative error if OpenMemoryService is instantiated without httpx being available.