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

Goes well beyond the annotations by disclosing the price ($25 USDC on Base or Arbitrum One), the x402 payment handshake, the required header, and that link verification is HEAD-with-GET-fallback, 8s timeout, redirects not followed. The meaning of 'leaks scanned' is left vague, and the idempotentHint/readOnlyHint semantics are only explained in the schema, not here.

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 value proposition and deliverable are front-loaded, which is good, but the price is stated twice ($25.00 at the start and again in the 'Paid tool — $25.00' clause) and the docs URL plus paid URL stack up at the end. Redundant price restatement and trailing link boilerplate cost it a point.

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 an output schema present, the description needn't enumerate return fields, and it still names the deliverables. Payment flow, auth header, token/network, and the paid URL are all covered; only the vague 'leaks scanned' claim and the absence of any failure/timeout behavior for the paid call leave small gaps.

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 parameters are already fully documented; the description only adds 'register sets the voice,' which mostly restates the enum already in the schema. No additional syntax, interaction, or constraint information is added for draft, links, required_terms, or idempotency_key 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?

Names a concrete verb+resource (a $25 correction pass on a draft) and enumerates what it does — formatting, live link verification, required-term checks, leak scanning — plus the deliverable (corrected copy + signed report). It does not distinguish itself from any sibling, though no sibling in the list offers copy correction, so confusion risk is low.

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?

Usage is implied by the deliverable description rather than stated; there is no 'use this when' or 'use X instead' guidance relative to the 23 sibling tools. The description does give solid invocation guidance (POST JSON to the paid URL with an x402 v2 PAYMENT-SIGNATURE header), which is helpful but is not the same as when-to-use guidance.

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