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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds the concrete transport detail 'GET /services' confirming the read path, and, with no output schema present, partially discloses the returned shape (name, duration, price, locations, resources, category structure), which is genuinely useful behavioral context the structured fields do not provide.

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 plus the endpoint reference; no padding or repetition. The trailing 'GET /services' is mildly redundant with readOnlyHint but is cheap and useful for agents that reason about REST paths.

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 7-parameter, zero-required list tool with no output schema, the description supplies the resource definition and a reasonable sketch of returned fields, and annotations carry the safety profile. It stops short of covering pagination behavior or the filter/parent-category relationships, but nothing critical for invoking it is missing.

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 86%, so the schema already documents nearly every parameter (q, limit, parent_id, is_category, location_id, start_after). The description's field list refers to returned data rather than query inputs and does not explain the undocumented external_id parameter or filtering composition, so it adds little beyond baseline.

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 and resource ('List services') and immediately clarifies the domain concept ('what customers book or queue for'), then enumerates the return fields. A reader can distinguish it from waitwhile_get_service by the list-vs-single semantics, though the description never names that 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 when-to-use guidance, no prerequisites, and no mention of alternatives such as waitwhile_get_service for a single record or the filter parameters for narrowing results. Usage is only inferable from the verb 'List', which is not stated guidance.

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