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

No annotations exist, so the description carries the full behavioral burden. It usefully discloses the return behavior (a verification result or a new nonce) and the required well-known paths, but says nothing about auth requirements, what a failed verification looks like, or whether the nonce path is a distinct mode of calling.

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?

Two dense sentences with no filler, and the mechanism/paths are front-loaded before the return-value note. Slightly compressed (the two-path mechanism could be clearer), but efficient.

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 single-parameter tool with no output schema, the description covers the key missing piece by explaining what is returned (result or new nonce). The main residual gap is the absence of any guidance on failure handling or the distinction between the two verification paths.

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?

Only one parameter and schema coverage is 100%, so the schema already fully documents agent_key. The description adds no format or provenance detail beyond what the schema's 'returned once by agent_register' note already provides, so the baseline 3 applies.

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?

Names a specific verb (verify) and resource (this agent's endpoint ownership), and describes the two mechanism sources. It is clear enough to act on, but it does not explicitly differentiate itself from the similarly named siblings agent_contact_verify and agent_endpoint_set.

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 implies the flow (endpoint verification following registration/setup) but gives no explicit when-to-use, prerequisites, or when to prefer this over agent_contact_verify. The agent must infer the sequencing itself.

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