Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 0%, so the description must carry the burden of explaining the two string parameters. It explains that substitute_category receives the transactions or that a default category is used, but it leaves 'category' under-specified, such as whether it expects an ID or name, and does not fully compensate for the missing schema documentation.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.