Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

readOnlyHint=true already declares the operation safe, and the description adds genuinely useful context: a 'Sensitive personal data' warning and the default 'newest first' ordering. It stops short of describing pagination semantics or rate limits, which would have pushed it higher.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Three compact fragments with the resource and returned fields front-loaded, followed by the sensitivity warning and endpoint. Every element carries information, though the raw endpoint path is marginally redundant with the tool name.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a read-only list tool with full schema coverage and no output schema, the description supplies the returned columns, default ordering, and a sensitivity flag—enough for correct invocation. Missing only pagination and filter-flag behavior details that would make it exhaustive.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema already documents all nine parameters including sort, limit, start, and the filtering flags. The description adds only the default ordering note, leaving the schema to carry the parameter burden, which matches the baseline 3.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb-resource pairing (list salary statements) and enumerates the returned fields (employee, date, status, gross and net amounts), which lets an agent distinguish it from the singular cashctrl_get_salary_statement. It does not explicitly name that sibling, so differentiation is implied by name rather than stated.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description notes default ordering ('newest first') but offers no explicit when-to-use guidance or routing to alternatives like cashctrl_get_salary_statement for single records. Usage is only implied by the 'list' framing.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.