When generating Toolinfo v1 output, the "url" attribute is required. Striker currently returns a toolforge.org URL if the is_webservice flag is set and falls back to returning the docs URL. If the webservice flag is not set and the docs url is not populated this results in an empty "url" attribute which violates the v1 spec.
Falling back to providing a link to the tool's info page in Striker seems like a reasonable fix.