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

With no annotations, the description carries the full burden, and it does this well: it discloses the scope limit (up to 20 pages), the operations performed (link/form/image tests), and the free-tier quota (one free check per site without a key). It does not describe side effects or latency, but for an audit-style tool the disclosure is strong.

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 purpose, then scope, then return values, then cost — a sensible order with little waste. It is somewhat dense (long enumerated list) but each clause conveys distinct capability information.

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?

There is no output schema, but the description fully explains the return contract (verdict as literal 'pass'/'fix', score out of 100, sub-scores, fix list, public report URL). Combined with the scope and quota notes, an agent has everything needed to call and interpret it.

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 parameters are already documented in the schema. The description reinforces the 'brief' semantics ('compares the brief with the pages'), but adds no syntax/format detail beyond the schema, so the 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?

The description names a specific verb+resource ('Check a website') and enumerates exactly what the check covers (up to 20 pages, links, forms, images, brief comparison, speed, security). An agent can tell precisely what this tool produces without opening the schema.

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 purpose, and the description notes a practical precondition ('One free check per site without a key'), which hints at quota/key requirements. However, there are no explicit when/when-not statements or alternatives (none exist among siblings), so guidance is only implied.

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