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

Annotations already declare readOnlyHint=true, openWorldHint=true and destructiveHint=false, so the safety profile is covered. The description adds the useful behavioral detail that results can be projected to a point in time, but says nothing about pagination behavior, result size, or whether rates vary per currency.

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?

Two short sentences with the payload stated first and the temporal option second; nothing is padded. The trailing 'GET /pay-grades' is mildly redundant with the tool's semantics but is cheap and aids endpoint-oriented agents.

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?

With no output schema, the description must convey the return shape, and it only goes as far as 'pay grades and their rates' — no indication of fields, nesting, or pagination envelope (page/limit hints live only in the schema). Adequate for a simple read, but not fully self-sufficient.

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% and each parameter (page, limit, as_at) is fully documented in the schema, including next_page chaining and RFC3339/yyyy-mm-dd formats. The description's mention of 'as at a date' merely echoes the as_at field, so baseline 3 applies.

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?

The description names the resource and its payload ('the pay grades and their rates') and pins the endpoint (GET /pay-grades), so an agent knows exactly what it retrieves. It lacks an explicit verb ('list') in the prose, relying on the name/title, and does not distinguish itself from siblings such as list_reference_data beyond the resource name.

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?

'Optionally as at a date' implies the historical-lookup use case, which is the only usage context offered. There is no statement of when to prefer this over siblings (e.g. list_reference_data or list_jobs) and no exclusions or prerequisites.

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