Compute a bike, scooter, motorcycle, wheelchair or walking route (Europe)

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

Annotations already declare readOnlyHint=true and openWorldHint=true, so no safety contradiction exists. The description adds behavioral value beyond annotations by explaining that the tool returns multiple route variants, surface/road composition statistics, and elevation/climb data, and by warning that coordinates are longitude/latitude and addresses must be geocoded first.

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 composed of three information-dense sentences: capability, use cases, and input requirement. Every sentence contributes utility, and the most important scoping information (what the tool computes) is front-loaded. It is slightly dense but not bloated.

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?

For a tool with 10 parameters, nested origin/destination objects, and no output schema, the description covers the essential behavioral contract: route variants, supported modes, route attributes, and coordinate format. Less obvious parameters like waypoints, include_steps, and include_geometry are fully documented in the schema, so nothing critical is missing from the overall tool definition.

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 100%, with each parameter already including a meaningful description and enums where applicable, so the description does not need to compensate. It does add a small amount of contextual meaning—such as that toll/highway avoidance applies to motorcycle trips and coordinates need geocoding—but the schema carries the main parameter-semantics weight.

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 states a specific verb ('Computes') and a precise resource: up to three route variants between two points in Europe, across six modes, with concrete route attributes such as cycle lanes, unpaved surfaces, climb, and turn-by-turn steps. This makes the tool's purpose unmistakable even without comparing it to siblings.

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 'Use it to' sentence provides explicit scenarios: planning a safe cycling commute, comparing safe vs fast options, checking wheelchair accessibility, and planning motorcycle trips avoiding tolls or motorways. There are no sibling tools to contrast with, but the use cases give clear context for when to invoke this tool.

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