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

Annotations already declare destructiveHint=true and the title flags infrastructure mutation, so the safety profile is covered. The description adds the specific mechanism (scale to zero instances), which is useful, but says nothing about reversibility, whether configuration/state is preserved, or that resume_service is the inverse. With annotations carrying the main burden, this 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?

Two compact sentences with the mutation warning and effect front-loaded. The raw endpoint string is somewhat redundant metadata but is not disruptive and gives useful API context.

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 two-parameter mutation with no output schema, the essentials are present: mutation warning, behavioral effect, and endpoint. Missing only reversibility/preservation notes, which are minor for this operation.

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% for both parameters (projectId, serviceId), so the schema fully documents them. The description only implies them via the endpoint path and adds no format or constraint detail. Baseline 3 applies.

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 (pause) and resource (service), plus the concrete effect of 'scaling it to zero running instances', which distinguishes it from siblings like resume_service, restart_service, and scale_service. It doesn't explicitly name those siblings, so it falls just short of the top score.

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 explicit when-to-use or when-not-to-use guidance and no named alternative. The implicit intent (stop running instances) can be inferred from the effect statement, but the agent gets no criteria for choosing pause over scale_service or restart_service.

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