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

No annotations are provided, so the description carries the full burden. It does disclose the price (0.003 USDC), the freshness requirement, the accepted proof methods, and the control-vs-legal-ownership distinction — useful behavioral context. It omits whether the call is read-only or mutating, what happens on failure, and what the caller receives.

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 dense sentence with no filler, and the cost and freshness constraint are placed up front. The phrasing 'Require a fresh ... challenge' is elliptical but compact.

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?

With no annotations, no output schema, and an undocumented nested evidence object, the description leaves too much for the agent to infer about inputs and outcomes. Given the tool's structural complexity, substantially more detail was warranted.

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 0% for two parameters, one of which is a nested object with five required subfields. The description maps loosely onto 'domain' and, via DNS-01/HTTP-01, onto the evidence method, but leaves challenge_sha256, verified_at, and independently_verified unexplained, so it does not compensate for the coverage gap.

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 identifies a domain-ownership verification via DNS-01/HTTP-01 challenges and distinguishes control from legal ownership, which is a meaningful resource-specific idea. However, the leading verb 'Require' is an odd framing for a tool call and never states plainly what the tool does (verify, attest, issue evidence, or gate an action). An agent knows roughly the subject matter but not the operation.

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 when-to-use guidance, no mention of alternatives among the many evidence sibling tools (rwa_sanctions_screening_evidence, agent_reputation_evidence, mcp_server_identity_evidence, etc.), and no preconditions stated beyond a fresh challenge. The 'freshness' hint is the only contextual cue.

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