Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100%, so baseline is 3, but the description adds selection semantics the schema does not: url targets one page, audit_id targets a whole site from start_site_audit, and the webhook accepts Slack/Discord/Teams and is optional. This meaningfully disambiguates which parameter to use.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.