Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, so every parameter (action, reason, txn_id, requestId, payment_ref) is already documented in the schema; baseline is 3. The description adds only the fragment about an object "with 3 fields including exception", which appears to describe a response shape rather than clarifying parameters, so no meaningful lift over the schema.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.