Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, so all three parameters are already documented in the schema. The description restates the critical constraint (bodyJson must be UNCHANGED, signature over MESSAGE_TO_SIGN) but adds no syntax, format, or failure-mode detail beyond it; baseline 3 applies.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.