estimate_cost

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It says nothing about side effects, permissions, return behavior, or required context, leaving the agent completely in the dark about what happens when the tool is invoked.

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?

'Estimate Cost' is extremely brief, but this is under-specification rather than effective conciseness. The description omits essential information, so it fails to earn its place as a helpful tool description.

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?

Even though there is an output schema (whose contents are unknown), the description is extremely vague and does not clarify what cost is being estimated, what inputs (if any) are expected, or what the output represents. The tool remains opaque.

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 tool has zero parameters, and the input schema is empty with 100% coverage. According to the rubric, a 0-parameter tool earns a baseline of 4 since there are no parameter semantics to explain or compensate for.

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 'Estimate Cost' simply restates the tool name, providing no additional specificity about what kind of cost, what inputs are involved, or what distinguishes this tool from others. It is essentially a tautology, not a clear statement of function.

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?

There is no guidance on when to use this tool, what prerequisites exist, or what alternatives might be considered. The description offers no contextual information to help an agent decide when this tool is appropriate.

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