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

With no annotations, the description must disclose behavioral traits. It does add meaningful context: the rate is 'indicative' (not a guaranteed final price), but the quote returned is 'binding'. It also indicates the price is at the sale price (a specific pricing policy). However, it does not state whether this operation is read-only, has side effects, requires authentication, or what happens if the amount is omitted. The disclosure is partial but not 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 two sentences with no wasted words. The primary purpose is front-loaded, and the key behavioral caveat (binding quote) is placed prominently. It is concise and easy to parse.

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, no annotations, and only two parameters with partial schema coverage. The description does not explain what the tool returns (e.g., a rate value, an estimated amount, or a JSON object), nor does it clarify the meaning of 'amount' or what happens when it is omitted. It also fails to mention any constraints like supported currencies or authentication. Given the low commitment from other sources, the description is insufficient for an agent to call this tool correctly without further assumptions.

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 schema provides a description for 'to' but not for 'amount'. The description mentions 'with an estimate for an amount', which hints that amount is used to produce an estimate, but it does not clarify whether the amount is in USDC, local currency, or what the estimate represents. It adds some value over the bare schema but fails to fully resolve the ambiguity for the undocumented parameter, especially given the 50% schema coverage.

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 the tool provides an indicative USDC → local-currency rate at the sale price, with an amount-based estimate, and that the quote is binding. This is a specific verb-resource pairing and distinguishes it from generic 'quote' by emphasizing 'our sale price' and the binding nature. However, it does not explicitly say 'returns a rate' or describe the output format, and it doesn't differentiate from the sibling 'quote' tool directly.

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 offers no guidance on when to use this tool versus siblings like 'quote' or 'buy'. It does not state whether this is a preliminary check before a purchase, if it should be used to fetch a final price, or any exclusions. The agent is left to infer the intended context from the name and description alone.

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