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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered; the description reinforces it with 'Read-only; plans can't be changed through this server.' With no output schema, the description is the only source describing the returned payload (plan, quota, dates, sync status/error, key expiry), which is genuinely useful behavioral context. It omits auth requirements and any freshness/caching behavior for sync status.

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?

The content is front-loaded on the resource and compressed into two sentences with no filler. The first sentence is a long enumerated list, but each item is payload the agent cannot otherwise learn because no output schema exists, so the density earns its place.

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 zero-argument, read-only account tool with annotations covering safety, the description supplies the full set of fields returned and explicitly rules out mutation. Nothing essential is missing, though the absence of any note on when the account must be inspected (e.g. before publishing) leaves a small gap.

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 and the input schema is an empty object, so there are no parameter semantics to document. Per the baseline for a 0-param tool, a 4 is appropriate; the description correctly spends its words on return content instead of non-existent inputs.

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 concretely enumerates what get_account returns — plan state (trial/active/past_due/expired), publish quota, trial/billing dates, and Partner Center connection details. That establishes the resource far better than the bare name, but it never contrasts itself with app-level siblings like get_app_settings or list_apps, so differentiation 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?

There is no statement of when to call this versus alternatives, and no prerequisites (e.g. whether it must be called before sync_now to check connection health). The only routing signal is 'plans can't be changed through this server', which is a negative capability note rather than usage guidance.

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