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 does not mention what input it expects semantically, what output it produces, whether it mutates anything, or any side effects. The description provides no behavioral information beyond the bare name.

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 it is under-specified rather than concise. The six-word tautology occupies the entire description without earning its place, since it only repeats the tool name.

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 specialized relation-extraction tool with four string parameters, no output schema, and no annotations, but the description gives no information about expected input format, semantics of the parameters, or return value. An agent has essentially no idea how to invoke this tool correctly.

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 even though the tool description adds nothing about parameters. However, the schema's parameter descriptions ('Input to process', 'Label to process', etc.) are generic placeholders and do not clarify how input, label, labels, and content relate to relation extraction.

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 pure tautology: 'Relation Extract: Relation Extract' simply restates the tool name and provides no verb, resource, or behavior. It fails to state what the tool actually does or how it differs from similarly named siblings like x402-ner-extract or x402-entity-link.

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 whatsoever about when to use this tool or when to prefer an alternative. The description contains no context, conditions, or exclusions, leaving the agent with no basis for selecting this tool over its many siblings.

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