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

No annotations are present, so the description carries the full burden of behavioral disclosure. It communicates a read-only, live price lookup, but it does not disclose potential failure modes for invalid ids, response format, rate limits, or external data dependencies.

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 well-structured sentence with no filler. The action and object are front-loaded, and the examples are placed at the end where they add value without distracting.

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 simple one-parameter read-only tool, the description is largely complete: it states the input, the output concept, and the currency. Minor gaps include lack of response-structure detail and no pointer to the sibling get_quote, but these are not critical for this low-complexity 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?

Schema description coverage is 100%, so the schema already documents the coin parameter. The description reinforces the id format with additional examples and clarifies that the price is in USD, but it adds no fundamentally new parameter semantics.

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 uses a specific verb ('Get'), names the resource ('current USD price of a cryptocurrency'), and identifies the parameter ('by its id') with concrete examples. It is clear and unambiguous, though it does not explicitly differentiate itself from the sibling tool get_quote.

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 clearly implies when to use this tool: whenever a current USD cryptocurrency price is needed for a known coin id. However, it gives no exclusions and does not mention the sibling get_quote as an alternative.

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