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

Annotations already establish read-only/non-destructive, so the description only needs to add context, and it does: it enumerates the returned fields (useful since there is no output schema), notes that the displayed price is the service price adjusted at checkout, and states the Cotlet API key access requirement. No behavior contradicts the annotations.

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 first two sentences largely restate the same field list ('services, duration, address, notes, deposit requirement and confirmation' vs 'provider, date and time, service duration, services, address, notes, deposit requirement and appointment confirmation'), which is redundant. The useful caveats about pricing and the API key come last instead of being front-loaded.

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 read-only single-record fetch with one fully documented parameter and no output schema, the description supplies the field inventory and pricing caveat an agent would otherwise lack. The main omission is any link back to list_appointments as the source of the ID.

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 description coverage is 100% and the single appointment_id parameter is fully documented in the schema as coming from list_appointments. The description adds no format or sourcing detail beyond that, so the baseline of 3 is appropriate.

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 resource (a single appointment) and enumerates the fields returned, so an agent can tell it apart from glossgenius_list_appointments. It stops short of explicitly contrasting with its siblings, but the retrieval-single-record purpose is unambiguous.

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 when-to-use guidance and no alternative routing: it never says to call glossgenius_list_appointments first or how this differs from glossgenius_get_client. The only hint is indirect, via the schema note that appointment_id comes from list_appointments, which is not in the description.

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