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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered. The description adds the set of attributes returned, which is genuinely useful behavior context, but says nothing about auth requirements, freshness/caching, or what happens if no account is configured.

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 compact fragment with no filler, and the most identity-bearing attribute (name, plan) is front-loaded. It is slightly clipped as a sentence fragment, but nothing in it is wasted.

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?

There is no output schema, so the description bears the burden of explaining what comes back; it names five fields but gives no types or formats, and 'whether it can send email yet' is left as a vague condition. For a parameterless read tool that is minimally adequate but not fully self-contained.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate; the baseline for a parameterless tool applies. The field list in the description is the closest thing to input guidance and it confirms no scoping arguments are needed.

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 is a noun phrase enumerating return fields ('name, plan, contact count, sending domain and whether it can send email yet') rather than a verb+resource statement; the verb 'get' exists only in the title. It does convey that this returns account-level attributes, which separates it from contact/campaign siblings, but the agent must infer the action from the title.

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 guidance, no preconditions, and no mention of any alternative. With zero parameters the invocation itself is unambiguous, but nothing tells the agent when account data is the right thing to fetch versus calling list_campaigns or get_contact.

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