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

With no annotations, the description has to carry the behavioral burden. It discloses the fiscal-year meaning and that omitting date/year defaults to the current fiscal year, which is useful, but it does not cover return shape, pagination, behavior when both date and year are supplied, or whether q is optional.

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?

The text is short and front-loads the purpose. The first line acts as a heading, and the remaining sentences give the most important scoping and date/year behavior without filler.

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?

The description is adequate for identifying the tool and its main date/year behavior, but for a tool with no output schema and 4 optional parameters it does not explain the response shape, q omission, or how date and year interact. Those are meaningful gaps for an agent trying to invoke it correctly.

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 coverage is 100%, so the baseline is 3. The description adds value beyond the schema by giving concrete location examples and explaining that date selects rates in force and that omitting date/year uses the current fiscal year; however, it does not explain q omission or verification_url.

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 gives a clear verb and resource ('Search ... Department of Defense per diem') and scopes it to location, country, or state names across CONUS and OCONUS. It does not explicitly distinguish this from siblings such as search_perdiem or get_dtmo_perdiem_conus/oconus, so it is clear but not fully sibling-differentiated.

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?

It implies usage through input examples and the date/year explanation, but never states when to use this tool versus search_perdiem, get_dtmo_perdiem_conus, get_dtmo_perdiem_oconus, or the GSA per diem tools. No explicit exclusions or alternatives are provided.

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