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

No annotations are present, so the description carries the behavioral disclosure burden. The verb 'Get' indicates a read-only operation and 'live' and 'spot' add meaningful context, but the description does not mention response structure, error behavior, rate limits, or authentication requirements. It is reasonably transparent for a simple lookup, but not fully comprehensive.

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 one concise sentence that front-loads the action, resource, and scope, followed only by illustrative ticker examples. There is no filler, redundant wording, or unnecessary context.

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 one-parameter tool with no output schema and no annotations, the description covers the core input requirement and the general nature of the result. The schema's note that prices are returned in USD helps, but the description does not explicitly describe the return format or behavior for invalid symbols, which is a minor completeness gap.

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%, and the sole parameter `symbols` is already fully described in the schema with the comma-separated format and USD return note. The description only repeats the ticker-symbol concept, adding no substantive meaning beyond the schema, so the baseline score of 3 applies.

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 a specific action and resource: 'Get live USD spot prices' for 'one or more cryptocurrencies by ticker symbol.' It explicitly scopes to crypto, which differentiates it from the sibling currency_convert tool, and includes concrete examples that remove ambiguity.

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 whenever live USD crypto prices are needed, but it does not provide explicit when-to-use guidance or call out alternatives such as currency_convert for fiat conversions. There is enough contextual signal for an agent to infer the right case, but no direct directive.

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