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

With no annotations, the description partially carries the burden by naming four outputs (profit, true CPM, break-even rate, verdict). This gives some sense of behavior, but it does not disclose whether it is a pure calculation, what assumptions are made, or any limitations. It adds basic output context but lacks depth.

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 sentence and therefore concise, but the leading '$0.09 via x402' is non-functional metadata that delays the actual purpose. Once past that, the output list is efficient, but the front-loading is not ideal.

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?

Given 8 parameters, no output schema, and no annotations, the description is insufficient for an agent to know what inputs to provide or what the full response structure looks like. It names four output concepts but doesn't connect them to input parameters or describe the verdict logic.

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 0%, and the description does not explain any of the 8 parameters. Parameter names like deadhead and x_payment are left undefined, and the description only vaguely relates to rate/miles via the concept of CPM. The description fails to compensate for the missing schema information.

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 indicates the tool computes freight load profitability, naming specific outputs (profit, true CPM, break-even rate, ACCEPT/REJECT verdict). It distinguishes itself from the sibling truck_cost_per_mile by focusing on profitability rather than cost-only. However, it lacks an explicit verb like 'calculate' and opens with irrelevant payment metadata.

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?

No guidance is given on when to use this tool versus alternatives or how the ACCEPT/REJECT verdict should be interpreted. There is no mention of prerequisites, context, or exclusions, leaving the agent without decision criteria for selection.

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