tool_get_destination_info

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

Description discloses that no authentication is required and lists output fields (currency, language, timezone). Since no annotations are provided, this is helpful. However, it lacks details on data source, freshness, or any other behavioral traits like rate limits or caching.

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?

Extremely concise: two sentences for the purpose and a brief Args section. No redundant words, and the key information is front-loaded. Every sentence adds value.

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?

Given the tool's simplicity (one parameter, no output schema, no annotations), the description covers the essential aspects: what the tool does and its input. However, it does not describe the output structure, which would be helpful for an agent to parse the result. Still, for a straightforward info tool, it is mostly complete.

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 description fully explains the only parameter 'country_name' with a clear example ('Japan'). This adds significant meaning beyond the schema, which only specifies type and required status. Schema coverage is 0%, so this explanation is essential and fully compensates.

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?

Clearly states the tool returns essential country info (currency, language, timezone). The verb 'get' and resource 'destination info' are specific. However, it does not explicitly differentiate from sibling tools like get_cost_of_living, get_exchange_rates, or get_language_phrasebook, which may also return subsets of this info.

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?

Only mentions 'No auth required' as a guideline. Does not specify when to use this tool over alternatives, such as when a summary is needed versus detailed information from other tools. No guidance on context or prerequisites.

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