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

Annotations already declare readOnlyHint=true, openWorldHint=false, and destructiveHint=false, so safety is covered without description help. The description still adds real context the annotations don't carry: the data scope is limited to Greater Accra and to confirmed providers, and the result is a coverage/count summary rather than provider records. Return shape is left to the output schema, which is appropriate.

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?

Two sentences, front-loaded with the use case and closing with the exclusion. Slightly wordy phrasing ('which trades and which districts of Greater Accra the list of confirmed service providers covers') but every clause carries information about scope.

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 parameters, a full output schema, and complete annotations, the only things an agent needs are when to call it, what it covers, and what to call instead — all present. No behavioral or scope gap remains for a discovery tool of this complexity.

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. The description correctly implies that no filtering input is needed or accepted, keeping it consistent with the empty schema.

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 the specific resource it returns: the trades and Greater Accra districts covered by the confirmed-provider list, plus the count of entries. It explicitly separates itself from services.find_providers. The only shortfall is that the verb is implicit ('use this when you need to know') rather than a direct statement like 'returns coverage metadata'.

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?

It gives both the positive condition (you need coverage/trades/districts/count, typically before searching) and an explicit negative instruction with the alternative named: 'Do not use it to find a provider: use services.find_providers for that.' Nothing is left to inference.

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