Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100%, so the baseline is 3. The description adds 'Provide text or input', acknowledging both parameters, but since both schema descriptions are identical boilerplate ('Text to process' / 'Input to process') it never explains whether they are aliases or which wins if both are supplied, so no real semantic value is added.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.