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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the agent knows this is a safe external read. The description adds the verdict framing but says nothing about live fetching, rate limits, behavior when robots.txt is absent or unreachable, or whether results are cached. With annotations carrying the safety profile, this is adequate but thin.

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?

A single tight sentence with the resource and the verdict scope front-loaded; every word earns its place and there is 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?

For a simple two-parameter read-only audit tool with no output schema, the description is minimally sufficient, but it leaves gaps an agent would care about: what a verdict result looks like, and how missing/unreachable robots.txt is reported. 'allow/deny verdicts' hints at the return shape but does not define 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 url and path are fully documented in the schema, including the default '/' for path. The description adds no extra meaning (e.g. how path interacts with wildcard rules or whether it must be URL-encoded), 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 (Check), a specific resource (a public site robots.txt), and the output scope (AI crawler allow/deny verdicts), which lets an agent distinguish it from the calc_* siblings and from agent_readiness_score. It does not explicitly contrast itself with the closest sibling (agent_readiness_score), so it stops short of a 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 'a public site' implies a precondition (the target must be publicly reachable), but there is no statement of when to use this versus agent_readiness_score or agent_ready_fix_pack, and no exclusions such as non-public/intranet sites. Usage is implied rather than guided.

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