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

Annotations already declare the operation is non-read-only, idempotent, and non-destructive. The description adds the zip-related condition but does not explain what setting the entry affects (e.g., which version/page users see) or what happens when the provided path is invalid. With annotations covering the safety profile, a 3 reflects adequate but limited extra behavioral context.

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 no wasted words. The key condition for use is stated immediately and nothing is repeated unnecessarily.

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 mutation tool with three parameters, no output schema, and low schema description coverage, the description is too thin. It omits important context such as the role of 'version' and 'key', what happens if 'entry' is not one of the offered paths, and how this affects the experience. Annotations cover safety but not the operational details an agent needs.

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 only 33%, and only the 'entry' parameter is documented in the schema. The description adds no information about 'key' or 'version', nor does it clarify how 'entry' relates to the paths offered by the upload result. With low coverage, the description should compensate but does not.

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 a specific action (naming the start page) and ties it to the experience entry point, which distinguishes it from siblings like set_cover and set_trailer. The condition 'when a zip had several and no index.html' further narrows its purpose. It is clear, though the verb 'name' is slightly less direct than 'set'.

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 gives an explicit precondition: use this when the uploaded zip had several pages and no index.html. This tells the agent when the tool is relevant, and implicitly when it is not needed. It does not name an alternative tool, but the condition is specific enough to guide selection.

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