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

Annotations already cover readOnly, non-destructive and openWorld, so the bar is lower, yet the description adds substantial behavioral context: cost ($0.1 USDC on Base), the two-step x402 payment flow (402 → PAYMENT-SIGNATURE → delivery), and the clarifying note that the tool call itself is free while payment happens on the returned URL.

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 definition is front-loaded with the resource and data source, then cost and return behavior. It is somewhat dense with parentheticals and em-dashes, but every sentence carries information and none is filler.

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?

With no output schema, the description compensates by explaining what the tool returns (an x402 URL to GET) and the payment handshake. Combined with a fully documented single parameter and covering annotations, an agent has enough to call it, though rate limits or invalid-DOT behavior are unaddressed.

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 single 'dot' parameter is fully documented in the schema (100% coverage), so the schema carries the meaning. The description adds no format or syntax detail beyond noting the BASIC context, so baseline 3 is appropriate.

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?

States a specific resource (carrier safety BASIC measures from FMCSA's SMS), names the underlying data source, and enumerates what is measured (unsafe driving, hours-of-service, vehicle maintenance) plus the intervention-threshold flags. It also distinguishes itself from sibling check_carrier_authority by positioning as 'the depth check behind' it.

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?

Gives clear when-to-use guidance ('run both before tendering') and explicitly pairs it with the related shallow check, so the agent knows the sequencing. It lacks an explicit when-not-to-use or failure-condition note, but the positive routing is clear.

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