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

With no annotations provided, the description carries the full burden of disclosing behavior. It states nothing about whether the tool is read-only, what data source it queries, what side effects exist, what authentication is required, or what the response format is.

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 extremely short, but this is under-specification rather than purposeful conciseness. Every word simply echoes the tool name and provides no distinct information.

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?

This is a two-parameter tool with no annotations, no output schema, and a completely uninformative description. An agent has no way to know what the expected inputs mean, what the tool does, or what it returns, making correct invocation impossible.

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%, so the baseline is 3. The parameter descriptions are generic ('Input to process', 'Domain to process') and the main description adds no parameter meaning, but the schema does at least document the parameters.

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 is a tautology: 'Soa Lookup: Soa Lookup' merely restates the tool name. It provides no verb, no resource definition, and no explanation of what 'soa' refers to, leaving the tool indistinguishable from the thousands of other x402 lookup tools.

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 about when to use this tool versus alternatives. There is no mention of scenarios, prerequisites, sibling tools, or exclusions, so an agent cannot decide when this lookup is the correct choice.

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