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

Annotations already mark the tool as read-only and open-world, covering the safety profile. The description adds that entry counts are live and that review dates are included, but it does not disclose return format, ordering, pagination, or other runtime behavior. There is no contradiction with the annotations.

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 sentence that conveys the resource and the returned information without unnecessary detail. It is front-loaded with the key subject and contains no filler.

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 listing tool with no output schema, the description adequately conveys what will be returned: sites with live entry counts and review dates. It lacks explicit guidance about choosing among sibling tools, but for such a simple read-only list operation this is a minor 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 input schema declares zero parameters, and the schema description coverage is 100% trivially. With no parameters to document, the description does not need to add parameter semantics, so the baseline of 4 applies.

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 precisely identifies the resource: sites in the .wiki finance canon. It also states the key returned information: live entry counts and review dates. It is distinct from siblings like canon_get_entry or canon_search, which clearly target different resources or operations.

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 intended use is implied by the title and description: the agent should call this when it needs an overview or enumeration of canon sites. However, it does not explicitly state when to use this tool instead of a sibling, nor does it mention any exclusions or prerequisites.

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