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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so safety is covered. The description adds useful behavioral context by explaining the return contents: actions ordered by impact, each with the gap and concrete steps, plus that the tool is free. It omits whether the latest check must exist, and the duplicated 'Free. Free.' is a blemish.

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 short and front-loads the core value: prioritized next actions from the latest check. It is slightly marred by the redundant duplicate 'Free. Free.' and an awkward colon-heavy construction, but overall it remains efficient.

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 low-complexity, single-parameter, read-only tool with no output schema, the description does well by explaining what the response contains and why it is useful. The only meaningful gap is that it does not clarify whether a prior visibility check is required or how stale results are handled.

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% for the single website parameter, so the schema already carries parameter semantics. The description does not mention the website parameter or add meaning about what happens if no prior check exists, so baseline 3 is appropriate.

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 that this returns prioritized actions from the latest visibility check, including the gap each action closes and concrete next steps. This is specific enough for an agent to understand the resource, though it does not explicitly name sibling tools like visibility_check or visibility_report to sharpen differentiation.

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 phrase 'actions from the latest check' and 'what to do next', suggesting this is used after a check exists. However, it never states prerequisites such as whether a previous visibility_check is required, nor does it name alternatives or when not to use this tool.

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