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

With no annotations, the description carries the full behavioral burden, and it does disclose the returned content set (links to sitemap, docs, contact, discovery documents). It is a zero-parameter read-only call, so safety risk is minimal, but it says nothing about response format, authentication, or whether the URL/tenant is fixed versus configurable.

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 front-loaded sentence that opens with the resource identity and then lists the payload. Efficient with no filler, though the parenthetical host is a slight interruption and the phrase 'every discovery document' is vaguer than the rest of the enumeration.

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?

There is no output schema, so the description must carry return-value meaning, and it does list the main returned artifacts. For a trivial zero-param informational tool this is close to sufficient; only the exact response shape and how the discovery documents are keyed remain unstated.

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 rules set the baseline at 4 for parameterless tools. There is nothing further the description could realistically add on the parameter front; the parenthetical host name usefully pins down which site is described.

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 names a concrete resource (BL Sports site metadata) and enumerates the specific contents returned: sitemap, docs, contact, and discovery documents. It implicitly separates itself from read_page/search_pages by being a catalog rather than a content fetcher, though it never states that contrast.

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?

Usage is implied rather than stated: describing itself as a directory of 'every discovery document' suggests it is the entry/orientation call before drilling into read_page or search_pages. However, it never explicitly says when to call it instead of its siblings, and gives no exclusions or prerequisites.

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