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

Annotations already carry the safety profile (readOnlyHint=true, idempotentHint=true, destructiveHint=false), so the description only needs to add content expectations, which it does by naming the kinds of links returned (sitemap, docs, contact, discovery documents). The openWorldHint aligns with 'every discovery document,' and there is no contradiction.

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?

A single, tight sentence with the core purpose ('What Ace is') front-loaded before the enumeration of included links. There is no filler, and the length is appropriate for a zero-parameter tool.

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 reference tool with no output schema, the description gives enough to know what to expect: a site overview plus links. The minor gaps — unspecified output format and no definition of 'discovery document' — are not material given the tool's low complexity.

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 takes zero parameters and the empty input schema fully documents this, so the baseline of 4 applies. The description adds nothing about parameters, but nothing is needed.

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 what the tool provides — information about what Ace (ace-bl.tech) is, plus links to sitemap, docs, contact, and discovery documents. The verb is implicit rather than explicit, but the resource and content scope are clear and it is readily distinguishable from the product/checkout/page siblings.

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?

When to use the tool is implied — an agent needing a site overview or navigation links would naturally select it — but the description never states this nor names alternatives such as search_pages or read_page. For a zero-parameter tool whose siblings are behaviorally distinct, the implied usage is adequate but not explicit.

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