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

No annotations are provided, so the description carries the full behavioral burden, yet it only discloses the returned fields. It says nothing about whether this is a read-only operation, whether ids are ordered or paginated, what a 'verification state' value looks like, or what an empty result means. For a zero-parameter list tool the risk is low, but the disclosure gap is real.

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 with no wasted wording and the domain tag placed at the end. It is efficient, though the parenthetical domain marker reads as an internal label rather than agent-facing prose.

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?

With no annotations and no output schema, the description is the only source of behavioral context, and it covers the return shape only partially via 'fact ids + verification states'. The simple zero-parameter contract keeps this from being inadequate, but 'verification states' is left undefined and no next-step routing is given.

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 schema has zero parameters, so there is no parameter meaning to add and the baseline of 4 applies. The description correctly spends no words on inputs.

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 a specific verb and resource ('List fact ids + verification states') and scopes it to the maternityuk domain, which distinguishes it from the ~30 sibling domain list_facts tools. It is telegraphic rather than a full sentence, but an agent can tell what it does without opening the (empty) schema.

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 only implied by the naming convention: list_facts for ids, get_fact to expand one, changes for updates. The description never names maternityuk_get_fact or maternityuk_changes as the follow-on or alternative, so an agent must infer the workflow from sibling names alone.

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