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

Annotations already declare readOnlyHint=true, and the description's GET endpoint is consistent with that. It adds modest value by clarifying results include build+deployment status and that both build and deployment service kinds are covered. It does not disclose pagination semantics (page vs cursor interplay) or result shape, but with a safety annotation present, the bar is lower and no contradiction exists.

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 tight sentences: the functional statement is front-loaded and the endpoint adds a compact verifiable detail. The endpoint is slightly redundant given readOnlyHint=true and the verb 'list', but it is a single low-cost clause, making the whole definition efficient.

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 list operation with fully documented parameters and a safety annotation, the description covers what is listed, the scoping project, the status payload, and the HTTP contract. With no output schema present, the agent still lacks explicit return-shape information, but the description hints at it adequately for a list tool of this complexity.

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 coverage is 100%, so per calibration the baseline is 3. The description's mention of 'in a project' and the endpoint path reinforce projectId's role as the scope identifier, but it adds no new meaning for page, cursor, or per_page beyond what the schema already documents clearly.

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), resource (services), and scope (in a project), plus informative detail on the three included types (build / deployment / combined) and that build+deployment status is returned. It is clearly a collection-read rather than a single-resource fetch, but it doesn't explicitly name siblings like get_service or list_service_builds to draw the boundary.

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 context of use is implied: listing services in a project, with pagination parameters documenting how to page through. However, there is no explicit guidance on when to choose this over northflank_get_service (single service) or northflank_list_service_builds (build history), nor any exclusion criteria. An agent must infer routing from sibling names.

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