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

Annotations already declare readOnlyHint=true, openWorldHint=true and destructiveHint=false, so safety is covered. The description adds auth context beyond the annotations ('Needs the user's Cotlet API key with access to this app'), which the agent cannot infer from structured fields.

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 opening two sentences are near-duplicates ('Services from your services menu, with their saved prices' vs. 'Returns the services on your services menu with their saved prices'), so a full sentence of the description is redundant. The remaining sentences (downstream usage, auth requirement) are useful and front-loaded well.

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?

There is no output schema, so the description must convey the return shape: it does say services are returned with their saved prices. Combined with the auth note and the book_appointment cross-reference, an agent has enough to call and use this tool, though filtering/pagination behavior is unstated.

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 and there is nothing for the description to compensate for. The mention of the 'name' field refers to returned data rather than an input, so it does not mislead.

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: it lists the services on the user's services menu along with their saved prices. It also implicitly distinguishes itself from the write-side sibling thryv_book_appointment by positioning itself as the source of the service name that tool consumes.

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 concrete downstream context: 'Use the name as the service parameter of book_appointment,' telling the agent exactly why and when this list is needed. It does not, however, state any exclusions or alternatives for listing services.

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