currency_cross

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

With no annotations, the description carries full responsibility for disclosing behavior. It does reveal a cost and payment method ($0.001 USDC via x402), which is useful, but it fails to mention whether the tool is read-only, requires authorization, has side effects, or returns any specific format. The 'Data & Weather tool' phrase is vague and potentially misleading, offering no concrete behavioral insight.

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 short and front-loaded with the name, but it includes the phrase 'Data & Weather tool' which is too vague to earn its place. The cost information is relevant. Overall, it is concise but under-specified, leaning toward insufficiency rather than efficient clarity.

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 name and the large sibling set, the description is far from complete. There is no actionable information about purpose, inputs, outputs, or behavior. With no output schema, no annotations, and a generic input schema, the description leaves an agent unable to safely or correctly invoke the tool.

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 input schema contains only a generic 'params' object with no property definitions, so it provides no parameter meaning. The description adds no parameter information either; it doesn't even hint at what inputs might be required (e.g., currency codes, dates). This leaves the agent completely uninformed about how to construct a valid request.

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 'currency cross — Data & Weather tool' does not clearly state what the tool does. It offers a category label ('Data & Weather tool') and a cost, but no verb or resource indicating the action. The name 'currency_cross' hints at currency exchange, but the description does not confirm this, leaving ambiguity and lacking distinction from siblings like 'convert_currency' or 'get_weather'.

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?

No usage guidance is provided. The description does not mention when to use this tool, what prerequisites exist, or alternatives. It only states a price, so an agent has no basis for choosing this tool over similar ones.

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