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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, openWorld), so the bar is lower. The description adds genuinely new behavioral context: the return contents (platform agent, hosting network with abuse email and CDN flag, registrar) and a paywall model ('a few free samples a day, then $0.005 USDC per call via x402') that an agent must know before calling. Rate-limit and cost specifics are exactly the kind of disclosure annotations cannot carry.

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 compact sentences with no filler, and the core purpose is front-loaded ahead of the pricing caveat. The opening clause ('Everyone to send an abuse or takedown report to for a site') is slightly awkward syntactically, which keeps it from a 5.

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?

The tool takes one simple parameter, has a full output schema so return values need not be described, and carries annotations covering safety. The description supplies the two things structured fields cannot: what parties are returned and the free-sample-then-paid pricing model, which is essential for correct invocation.

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?

There is a single parameter with 100% schema description coverage ('Domain or URL'), so the schema already does the work and the baseline is 3. The description adds no format detail such as whether a bare domain, a full URL, or a subdomain is preferred, so it neither compensates nor detracts.

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 resource: the set of parties (platform agent, hosting network, registrar) to whom abuse or takedown reports for a site should be sent. This is clearly distinguishable from siblings like domains__dmca-agent or domains__facts, though it doesn't explicitly name an alternative. The verb is implied (retrieve) rather than stated, which keeps it just short of 5.

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 phrase 'to send an abuse or takedown report to for a site' implies the use case, and the pricing note signals a cost gate, but there is no explicit when-to-use versus when-not-to-use guidance nor a pointer to the related dmca-agent tool. Usage is inferable rather than stated.

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