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

No annotations are provided, so the description carries the full burden of behavioral disclosure. 'Get' implies a read operation, but the description does not mention external API behavior, rate limits, pagination, authentication, or any other caveats. The empty '[COST: ]' prefix hints at missing disclosure rather than providing it.

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 minimal and front-loaded, with no wasted wording. However, the empty '[COST: ]' placeholder is dead weight and slightly detracts from the otherwise clean 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?

For a zero-parameter read tool with an output schema, the description is close to operationally sufficient. However, it lacks any usage context, sibling differentiation beyond the name, or behavioral caveats, leaving the agent to infer when and why this tool should be selected over similar data-fetching 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 tool has zero parameters, so there is no parameter ambiguity for the description to resolve. With no parameters, a baseline score of 4 is appropriate because the schema already fully covers this dimension.

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 a specific verb ('Get') and resource ('CoinCap assets list'), making the tool's core purpose unambiguous. It also distinguishes itself from the sibling get_coincap_rates by targeting 'assets' rather than 'rates'.

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 gives no guidance about when to use this tool versus alternatives. It does not mention get_coincap_rates or the many other crypto-related siblings, nor does it state any exclusions or preferred contexts.

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