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

With no annotations, the description carries the full behavioral burden but only partly discharges it. It does disclose pagination behavior ('50 a page'), which is genuinely useful, and notes the optional service filter. It omits ordering, what an entity record contains, and any permission/auth context.

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 the resource stated first and the scoping/filter constraints following. It is compact with no wasted clauses, though the parenthetical and 'The Asbestos Survey Cost register entities' construction read somewhat awkwardly.

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 output schema, no annotations, and four parameters at 0% coverage, the description covers the essentials (region, optional service, pagination size) but leaves gaps around page navigation, return shape, and entity contents that an agent would need for full confidence.

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?

Schema coverage is 0%, so the description must compensate. It usefully clarifies that region accepts either an id or a name (a state or jurisdiction) and that service is an optional filter, covering two of four parameters. It says nothing about the 'page' parameter and only indirectly implies pageSize via '50 a page'.

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 the resource (register entities) and scope (one region, optionally one service), which distinguishes it from the broader entities_search and single-record entity_lookup siblings. The verb is implicit rather than explicit, and the awkward 'The Asbestos Survey Cost register entities' phrasing slightly obscures the action, but an agent can tell what it returns and for what locale scope.

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?

There is no explicit guidance on when to use this tool versus entities_search, entities_export, or entity_lookup. The region+optional-service framing implies a usage context, but no conditions, exclusions, or named alternatives are given, leaving the agent to infer when this is the right choice.

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