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

Annotations already declare readOnlyHint=false, idempotentHint=false, destructiveHint=false, and openWorldHint=true, so the mutation/write nature is known. The description adds genuine context beyond that — no email required, the exact well-known path to serve, and the downstream benefit — but omits token expiry, whether re-calling invalidates prior tokens, and how verification is completed.

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 tight sentences with zero filler; the mechanism (token + serve path) is front-loaded and the payoff is stated last. Every clause earns its place.

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 output schema, the description carries the return-value burden and does so adequately by saying a token is returned and where to serve it. It leaves the completion step (verify_domain_check) and token lifetime unstated, a minor but real gap.

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 both 'domain' and 'api_key' are already documented in the schema, establishing a baseline of 3. The description reinforces the domain requirement via the well-known URL template but adds no syntax or format detail beyond the schema.

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 states a specific verb+resource: it issues a verification token for a domain the caller controls, and names the exact artifact (a file served at /.well-known/anansi-haven-verify.txt). It is clearly distinct from read-oriented siblings, though it never names verify_domain_check as the complementary step.

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?

'Self-serve operator verification (no email needed)' and 'A verified operator can post in the Commons' imply when to use it and why. However, no alternative or prerequisite is stated explicitly (e.g., that verify_domain_check must follow), so usage must be inferred.

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