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

Does far more than the annotations: discloses the $0.05 USDC cost, that a successful call settles an irreversible payment reducing the payer's balance, that a stored report is created, that the target site is unmodified, and that an x402-aware client is required. That is rich behavioral context beyond readOnlyHint/destructiveHint/openWorldHint.

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?

Front-loaded with the selection cue and scope, then exclusions, then cost/settlement behavior. Every sentence carries information, though it is fairly dense and slightly long; still no filler.

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?

Covers scope, exclusions, cost model, payment irreversibility, client prerequisite, side effects (stored report, site unmodified). For a paid, side-effecting single-param tool with no output schema, this is complete.

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% and the single url parameter is fully documented in the schema (HTTPS-only, rejects private/loopback/credentialed URLs). The description adds nothing about the parameter beyond the 'target website' reference, so 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?

States a specific verb (review) and resource (website release-security posture) with an enumerated scope: headers, cookie flags, mixed content, script integrity, server disclosure. It distinguishes itself from siblings like verify_page and check_page by naming exactly what it reviews and explicitly stating it does not run browser QA or probe the site.

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?

Opens with 'Choose this for...' and enumerates the negative cases ('does not run browser QA, probe the site, execute code, or replace a security audit'). It also names the required client prerequisite (x402-aware). This is explicit when/when-not guidance.

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