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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world, so the safety profile is fully covered and the description correctly does not restate it. It adds useful disclosure about the payload (three counts plus a last-modified timestamp), but says nothing about whether counts reflect only published records consistently, caching/staleness of the timestamp, or response shape — relevant since there is no output schema.

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 filler — it names the resource domain first and the change-timestamp detail last. Every clause carries information an agent would otherwise have to discover by calling the 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 counter tool, the description covers what is returned well enough to call it blind, and annotations cover the safety profile. The only gaps are return-format specifics and the freshness semantics of the 'last changed' value, which are minor given the tool's simplicity.

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, so the baseline is 4; there is no parameter meaning to add or omit, and the description does not introduce confusion about 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?

States a specific verb (get) and precisely enumerates the resources being counted — published heating contractors, places, and categories — plus a last-changed timestamp. This implicitly distinguishes it from list_categories/list_places (counts vs. listings), though it never names a sibling explicitly.

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 when-to-use guidance, no stated preconditions, and no routing to alternatives such as list_categories or search_listings. An agent must infer that this is a cheap overview/summary call before drilling into the list tools.

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