Exact-decimal financial calculation with its published convention (PAID $0.01)

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

Annotations already establish that this is a non-readonly, non-destructive, open-world, non-idempotent tool. The description adds important behavioral context by disclosing the remote POST route and the exact payment requirement of 0.01 USD via x402/base/usdc on eip155:8453.

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 short and front-loads the purpose before the route/payment details. It repeats the title somewhat, but the payment and route information are useful and compact.

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?

Although an output schema exists and annotations cover some safety traits, the description leaves the input parameters, operation selection, and expected usage almost entirely unexplained. For a paid remote calculation tool with four undocumented parameters, this is materially incomplete.

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?

There are four parameters with 0% schema description coverage, and the description does not explain what `params`, `operation`, `conventions`, or `evaluatedAt` mean. The vague phrase 'published convention' does not sufficiently document even the `conventions` parameter.

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 identifies the tool as an exact-decimal financial calculation with a convention, which gives a high-level purpose. However, it does not specify what financial operation it performs or how it differs from the many sibling finance/calculation tools.

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, when to avoid it, or which sibling tools are relevant alternatives. It only states the remote route and payment mechanism.

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