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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds the 'CLaimed' filter and 'aggregate stats' detail, which is useful. However, it doesn't describe the output format or pagination for what could be a large directory. Given annotations cover the key behavioral aspects, 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, concise sentence that efficiently packs the core purpose, scoping, and key detail (aggregate stats). It's front-loaded with the main action and resource, and there's no wasted words.

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 zero-parameter, read-only, simple listing tool, the description is sufficiently complete. It states what will be returned (pages and stats), the scope (public), and the auth requirement (none). The lack of an output schema is compensated by the description's clarity. The only minor gap is no mention of ordering or size limits, but that's not critical for a directory browse.

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, so the schema is empty. The description correctly explains what the tool returns (a directory of builder pages with aggregate stats), which is the only parameter-relevant semantics needed. With no parameters, the description fully compensates for the lack of schema, earning a 4.

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 the tool's purpose: browsing all claimed public builder pages with aggregate stats over listings. It specifies the resource (builder pages) and the action (browse), making it distinct from similar page-related tools like page_get or page_me. The phrase 'All CLAIMED public builder pages' adds precision.

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 implies the tool is for directory-style browsing, but it doesn't explicitly state when to use it over alternatives like page_leaderboard or page_get. It mentions 'Public, no auth' which is useful context, but lacks explicit when-to-use or when-not-to-use guidance relative to siblings.

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