Can you also add a change to https://github.com/modelcontextprotocol/php-sdk/blob/main/src/Server/Builder.php#L526 ? Avoid calling the createDiscoverer when Finder isn't accessible + log? This makes php-sdk not dependent from the Finder.

@soyuka, this means the discoverer will never be called if there's no finder, and we won't be able to raise the exception to prompt the installation of the finder itself. By your suggestion, adding a null check silences the error in the logs, and the program continues as expected. Is this the ideal behaviour, or should we halt the program with the exception as we have it, so users go back to install? Let me know what you think as well @chr-hertel

Mhh from this PR I thought you wanted to move the Finder to a dev-requirement making this a soft dependency. From my point of view if that's the case the code should work after installing with composer and I'd have thought that it'd make sense to skip classes dependent from the Finder.

If we don't want to move this requirement, then I'm not sure I understand how this code path is going to happen as its required in our dependencies.