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

No annotations are provided, so the description carries the disclosure burden, and it does add real behavioral context: the listing includes planned-but-not-yet-available regimes, which would surprise an agent expecting only active data. It stops short of stating read-only nature, auth needs, or that no filtering/pagination applies.

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?

A single front-loaded sentence with the verb and resource first, then the useful contents. No filler and nothing repeated from structured fields.

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 an output schema present and zero parameters, the description only needs to frame what the list contains, which it does. Ordering, scope, and relationship to the rate/trip tools are left unstated, a minor gap given the low complexity.

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?

The tool takes no parameters, so there is nothing to document; baseline is 4. The description correctly does not waste space explaining inputs.

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 and resource ('Lists the available regimes') and enumerates the payload contents (validity periods, snapshot dates, sources, calculator rules, planned regimes). It does not name a sibling or explain how it differs from get_per_diem_rates, but the resource focus on 'regimes' is distinct enough to identify.

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 implies this is the discovery/overview call for regimes but gives no explicit when-to-use statement, no prerequisites, and never mentions the alternatives (get_per_diem_rates, search_per_diem_locations, calculate_trip_allowance). Usage must be inferred from the resource name alone.

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