get_service_purchases

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

No annotations are provided, so the description carries the full behavioral burden. It helpfully discloses the return shape ({ items, total, limit, skip, hasMore }) and the page-size ceiling, but says nothing about permissions, invalid serviceId behavior, or whether an empty result is an error.

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?

Three short sentences with the purpose front-loaded, followed by return shape and limits – no filler. The limit defaults are repeated from the schema, a minor redundancy.

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 simple three-parameter read tool with no output schema, the description compensates by declaring the exact response fields and pagination behavior. Only edge-case behavior (invalid serviceId, empty results) is left unspecified.

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%, so all three parameters are already documented in the schema, and the description merely restates the default/max limit values. Baseline 3 applies since the schema does the heavy lifting and the description adds no new parameter semantics.

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 (Get) and resource (purchase orders) scoped to a service, which distinguishes it in substance from the sibling get_project_purchases. It does not name that sibling or otherwise explicitly differentiate, so it falls short of a 5.

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 statement of when to use this tool versus get_project_purchases or any other sibling, and no prerequisites or exclusions are given. Usage is only inferable from the tool name and the 'for a service' scoping phrase.

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