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

The annotations already establish that this is a read-only, non-destructive operation. The description adds useful behavioral detail about what is returned: when visits occurred, how long they lasted, the order of sections read, and clicks/copies. It does not mention pagination or privacy constraints, but it meaningfully supplements the annotations.

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 efficient sentence with the scope front-loaded and no wasted language. Every listed item helps the agent understand what the tool returns.

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?

With two required parameters, read-only annotations, and no output schema, the description does a good job naming the returned fields. It remains silent on pagination or volume limits, which is a minor gap for a visit-history 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?

Schema description coverage is 100%, so both required parameters are fully documented by the schema itself. The description reinforces that the result is scoped to one reader and one link, but adds no parameter syntax or format details beyond what the schema already provides.

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 specifies the resource and scope: every visit by one reader of a link, including timing, duration, reading order, clicks, and copies. It is more specific than the title alone, though it does not explicitly contrast itself with sibling tools such as recent_activity or website_visits.

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 scope implies when to use it—when you need activity for a specific reader on a specific link—but the description gives no explicit when-to-use guidance, exclusions, or alternatives such as recent_activity for broader activity.

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