get_crypto_prices

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

With no annotations, the description carries the full burden. It adds the fact that using the tool costs $0.001 USDC via x402, which is useful behavioral information. However, it does not disclose what data is returned, whether prices are real-time, or any rate limits or authentication requirements.

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 very short, which is good for conciseness, but the phrase 'Data & Weather tool' is confusing and adds little value. The cost statement is useful but could be better integrated into a clearer structure.

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?

The tool has no output schema and minimal description. Given the nested 'params' object and the potentially complex nature of cryptocurrency price retrieval, the description is severely incomplete. It does not explain inputs, outputs, or how this tool fits among many siblings.

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 meaningful parameters, and the description does not explain any required or optional fields. The schema description coverage is 100% only because the sole property is a placeholder. The description adds no parameter meaning.

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 states 'get crypto prices', which is a specific verb+resource that clearly indicates the tool retrieves cryptocurrency price data. It is distinguishable from siblings like convert_currency and get_weather, though it lacks detail on which cryptocurrencies or price types are covered.

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 provides no guidance on when to use this tool versus alternatives like currency conversion or financial calculators. It only mentions a cost, which is not a usage criterion. There is no context about required inputs or scenarios.

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