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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds that the tool includes 'rules to respect' and 'other machine-readable surfaces,' which is mildly useful context but not a full behavioral disclosure.

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 description is one efficient sentence plus a direct call-to-action. It front-loads the purpose and avoids redundancy, though the phrasing is slightly vague and could be tightened with more concrete terms.

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?

Given zero parameters, a read-only/idempotent annotation profile, and no output schema, the description covers the essential purpose and when to call it. It could say more about what kind of answer the agent will receive, but it is adequate for a meta-orientation tool.

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?

The tool has zero parameters and the schema is an empty object with 100% coverage, so there are no parameter semantics for the description to explain. The baseline of 4 applies here.

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 that the tool returns an overview of what the site does, which services are available, and rules to respect. This gives agents a clear sense of the resource being described, though it does not use a direct verb like 'returns' and is somewhat abstract.

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?

'Call this first if you are unsure whether this site can answer the question' gives explicit guidance on when to invoke it. It does not mention alternatives or exclusion conditions, but the instruction is actionable and sufficient for routing decisions.

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