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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds no extra behavioral details beyond the operation itself (e.g., no mention of pagination or rate limits), but it is consistent with the annotations. With strong annotation coverage, a 3 is appropriate.

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 a single, front-loaded sentence with zero filler. It states the action, the output, and the purpose in under 30 words, making it highly scannable.

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 tool with two parameters (one required) and no output schema, the description adequately explains what the tool does and what the output will contain ('list every outbound link...'). It doesn't address edge cases like the limit parameter's effect or pagination, but for a simple read-only tool this is minor. The output format is implied clearly enough.

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 (page_url and limit) are already documented in the schema. The description adds no additional parameter semantics; it simply restates the action. 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 clearly states a specific action ('Fetch one referring page') and a specific output ('list every outbound link with its anchor text and dofollow/nofollow classification'). It distinguishes itself from sibling tools like 'link_audit' or 'referring_domain_summary' by focusing on a single page's outbound links.

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 description provides a clear use case ('so you can see how a site links out before requesting a link change') but does not explicitly mention alternative tools or when NOT to use it. It gives contextual guidance but lacks exclusions or comparison to siblings.

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