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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so safety is covered; the description goes beyond that by disclosing the returned shape (site_url as website, backends as per-service URLs) and the terminal states. With no output schema, this return-value context is genuinely additive. It stops short of stating failure modes or whether backends is absent while building.

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 short sentences, front-loaded with purpose and followed by field semantics; nothing is wasted. The telegraphic 'site_url is the website' phrasing is terse but readable.

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 two-parameter read tool with solid annotations this is close to sufficient, and the return-field gloss helps given there is no output schema. However, it never explains how to obtain deployment_id or how this differs from list_deployments/get_status, which an agent needs in order to call it correctly.

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 only 50%: project_id is documented in the schema (including the use_project session alternative) while the required deployment_id has no description anywhere. The description discusses response fields but says nothing about either input, so it fails to compensate for the coverage gap on the one mandatory parameter.

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 and resource ('Get deployment status') plus the status transitions it reports (BUILDING → LIVE / FAILED), so an agent knows exactly what comes back. It never names list_deployments or get_status, so differentiation from closely related siblings is left to inference.

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 status lifecycle hint implies a polling/verification use case, but there is no explicit statement of when to call this versus list_deployments (find a deployment) or get_status. No prerequisites, no note on where deployment_id comes from, and no when-not guidance.

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