Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100%, so the baseline is 3, but the description adds meaningful semantics: the email is the account identifier, accept_terms must be true for legal agreement, and no existing API key or x402 payment is needed. It does not discuss the optional name parameter, but the schema already documents that adequately.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.