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

Annotations already communicate that this is read-only and non-destructive; the description adds useful context about what the response includes. It does not disclose error behavior, not-found cases, or how the optional lang parameter affects the result, so the transparency is adequate but not rich.

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 description is a single, front-loaded sentence with no filler. Every part is informative: the action, the resource, the lookup method, and the expected response contents.

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 straightforward two-parameter getter, the description is sufficient: it names the resource, the required ID, and the main response contents. It lacks explicit language-behavior or error-handling detail, but the schema and annotations cover the remaining essentials.

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 both id and lang are already documented. The description itself only restates the 'by ID' aspect and adds no new parameter-level detail; the baseline of 3 is appropriate when the schema carries the parameter documentation burden.

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 clearly states a specific retrieval verb ('Get'), a precise resource ('PCP catalog service'), and the identifying key ('by ID'). It also names the two relevant response contents — available personal data types and processing places — which distinguishes it from list_pcp_services and get_site_pcp_service.

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 description implies the usage through the resource type and ID, and the schema's id description ('from list_pcp_services') gives a helpful workflow hint. However, there is no explicit when-to-use or when-not-to-use guidance, nor a pointer to a site-scoped sibling like get_site_pcp_service.

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