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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint=false, which cover the safety profile. The description adds the specific behavior of returning links to site documents, which is useful but not deeply detailed. It does not mention what the actual output format is (e.g., a list of URLs, HTML, etc.) or whether there are any rate limits, but with annotations covering safety, this is acceptable.

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, compact sentence that is front-loaded with the core purpose and then enumerates the types of links provided. It is concise and to the point, though the phrasing 'what Mags Tack is' is a bit informal.

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?

Given that the tool has no parameters, no output schema, and its annotations already cover safety and idempotency, the description is complete enough for an agent to know what to expect: a collection of links to site resources. It does not describe the output format in detail, but for a zero-parameter discovery tool, this is not a major gap.

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 0 parameters, and the schema is empty, so the description carries no burden to explain parameters. A baseline score of 4 is appropriate since there is nothing to compensate for.

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 the tool provides information about the site (Mags Tack / magstackonline.com) and lists the types of documents it links to (sitemap, docs, contact, discovery documents). It distinguishes itself from the sibling tools (read_page and search_pages) by focusing on top-level site metadata, not page content or search.

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 that this tool is for getting an overview of the site, such as when an agent needs to understand the site's structure or find links to documentation. However, it does not explicitly state when to use this tool versus 'search_pages' or 'read_page', nor does it mention any alternatives or exclusions.

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