Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100%, so baseline is 3. The description adds value by including two valid topic values not present in the schema description ('buy' and 'benchmark') and by explicitly linking topic=... to a recommended call sequence. However, it doesn't explain what each flow keyword pertains to, leaving some semantic interpretation to the agent.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.