trybiut_pricing_countries

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

With no annotations, the description carries the disclosure burden. It explicitly states that no login is required, and 'List' indicates a read-only, non-mutating operation. It does not describe output details, but for a zero-parameter lookup this is sufficient.

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 no filler. The action is front-loaded, and the key access detail is separated cleanly. Every word earns its place.

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 simple zero-parameter list operation, the description is complete: it identifies what is listed and states the authentication requirement. The absence of an output schema is mitigated by the low complexity and self-evident return value.

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 schema has zero parameters and 100% coverage, so there are no parameter semantics that need explaining. The baseline for a no-parameter tool is 4, and the description adds no confusion.

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 uses the specific verb 'List' with a precise resource ('countries covered by the pricing/market-data module'), making it immediately clear what the tool returns. No sibling tool covers countries, so it is naturally distinguished.

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 note 'No login needed' gives clear context on when this tool can be used: it is a public, unauthenticated lookup. None of the sibling tools overlap in function, so explicit alternatives are not necessary, though they are not named.

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