convert_currency_latest

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

Annotations provide readOnlyHint=true and openWorldHint=true, indicating a safe, read-only operation with potentially dynamic data. The description adds context about using 'latest exchange rates,' which clarifies the temporal aspect and data freshness, but doesn't disclose rate limits, accuracy, or source details beyond what annotations imply.

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 description is a single, efficient sentence that front-loads the core functionality ('converts an amount') and includes key qualifiers ('latest exchange rates'). There is no wasted verbiage, and it directly addresses the tool's purpose without redundancy.

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 moderate complexity (currency conversion with three parameters), annotations cover safety and dynamism, but there's no output schema to describe return values. The description lacks details on output format (e.g., numeric result, timestamp), error handling, or rate limits, leaving gaps for an agent to infer behavior.

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%, with clear parameter descriptions and enums for currencies. The description adds minimal value beyond the schema, mentioning 'amount' and 'currencies' generically without explaining ISO4217 codes or validation rules. Baseline 3 is appropriate as the schema carries most of the semantic burden.

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 clearly states the tool's purpose with specific verbs ('converts') and resources ('amount from one currency to another'), and specifies the rate source ('latest exchange rates'). It distinguishes from sibling 'convert_currency_specific_date' by implying temporal scope, though not explicitly naming the alternative.

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 usage context through 'latest exchange rates,' suggesting this is for current conversions rather than historical ones. However, it doesn't explicitly state when to use this tool versus alternatives like 'convert_currency_specific_date' or 'get_historical_exchange_rates,' nor does it mention prerequisites or exclusions.

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