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

readOnlyHint=true already establishes this as a safe read, so the description's contribution is mainly the return content, which overlaps with the output schema. It does not say what happens when no deploy exists, whether the phase is a snapshot or live state, or whether polling is expected.

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 with no filler; every clause describes distinct return content. The phrasing is slightly list-like but earns its length.

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?

With an output schema present, the description needn't detail return structure, and a single fully-documented parameter plus a readOnly annotation keeps the surface small. The only real gap is the absence of failure/empty-state or usage context, which is minor at 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?

Only one parameter exists and the schema documents it fully (100% coverage, uuid format, 'id of a service on this account'). The description's 'of a service' aligns with the schema but adds nothing beyond it, so the 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?

The description names the resource (a service's current deploy phase) and enumerates the payload: live URL, plain-language failure reason, launch checklist. An agent can tell this apart from generic siblings like logs or action_status. It lacks an explicit verb phrase ('Get/Retrieve'), which keeps it from 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 guidance on when to call this versus related siblings such as logs, action_status, preflight, or redeploy. The agent must infer that this is the post-deploy verification call. No prerequisites or exclusions are stated.

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