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

No annotations are provided, so the description carries full burden. It discloses the external service (Nominatim) and the return values (latitude and longitude), which is helpful. However, it omits behavioral traits such as rate limits, authentication or payment requirements (the x402 prefix suggests payment), and error behavior.

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?

A single, front-loaded sentence with no wasted words, though it starts with a redundant 'Geocode: Geocode' prefix. It is appropriately sized for the tool's simplicity.

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 no annotations, no output schema, and four ambiguous parameters, the description is insufficient. It fails to clarify parameter aliases, usage context, or service constraints (e.g., Nominatim usage policy). An agent would need more to invoke confidently.

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%, but the schema descriptions are uninformative ('Q to process', 'Input to process', etc.). The description mentions only 'query or address', leaving 'q' and 'input' unexplained. It does not clarify that these four parameters are likely aliases for the same input, nor which are required.

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 verb ('Geocode') and resource ('place name or address to coordinates'), and names the external service (OpenStreetMap Nominatim). However, it does not distinguish from sibling tools like x402-reverse-geocode or x402-geo-distance, so it lacks sibling differentiation.

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 explicit when-to-use guidance or alternatives. 'Provide query or address' is a simple instruction but doesn't tell the agent when to choose this over reverse-geocode or other geo tools. No exclusions or prerequisites.

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