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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered. The description adds one useful behavioral fact not in the annotations: the payload includes a starting price per service. It says nothing about ordering, pagination, or what happens for a center with no services.

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 short sentences with zero filler; the capability statement is front-loaded and the parameter prerequisite follows. Nothing is repeated or padded.

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 carry the return contract, and it only sketches it ('a starting price each') without indicating other service attributes, result shape, or ordering. Combined with the missing sibling differentiation, it is adequate but leaves gaps for a tool with no output schema.

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?

With one parameter at 100% schema description coverage, the baseline is 3. The description's note that centerId is 'the numeric id from find_centers' restates the schema's own parameter description almost verbatim, so it adds no meaning beyond the structured field.

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 (list) and resource (services offered by a center) plus the scope qualifier 'with a starting price each'. An agent can distinguish this from sibling tools like find_centers or get_center_details, though the boundary with get_center_details (which may also surface services) is never addressed.

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?

The second sentence tells the agent where the id comes from ('the numeric id from find_centers'), which is real prerequisite guidance. However, there is no statement of when this tool is preferable to get_center_details or other siblings, and no exclusions or call-ordering beyond the id source.

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