distance_2d

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It does mention the x402 cost of $0.001 USDC, which is a useful non-default trait, but says nothing about side effects, return behavior, or any other operational characteristics. The presence of cost info alone justifies a marginal score of 2.

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 but under-specified. The two sentences 'distance 2d — Other Utilities tool' and 'Costs $0.001 USDC via x402' do not convey any meaningful information about the tool's purpose or usage. Brevity without substance is not effective conciseness.

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 appears to be a simple utility but its description is completely inadequate. There is no information about inputs, outputs, or behavior. Even with a simple tool, the description should at least state what it does; it fails to do so, making the definition severely 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?

The schema only provides a generic 'params' object with a placeholder description, and the tool description adds no information about the required keys or types. Despite a nominal 100% schema coverage, the coverage is superficial and unhelpful. The description completely fails to explain what parameters to pass.

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 'distance 2d — Other Utilities tool' essentially restates the tool name and places it in a generic category without specifying the actual operation (e.g., calculating Euclidean distance between two points). No differentiation from siblings like 'calculate_distance' or 'slope_calc' is provided.

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 alternatives. It does not state use cases, prerequisites, or scenarios where other tools would be preferred.

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