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

Annotations already declare readOnlyHint, idempotentHint, and non-destructive, so the safety profile is covered. The description adds genuinely new context beyond them: the Pro-feature gating, the browser-based OAuth consent requirement, and the exact fields reported. That is real added value for a status tool.

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 sentences, front-loaded with what the tool reports, then the prerequisite. Every clause carries information; the inline URL is functional rather than filler. Slightly dense but no waste.

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 no output schema, the description carries the burden of describing return values and does so by enumerating all four reported facts. It also covers feature gating and the setup prerequisite, so an agent has everything needed to call it and interpret the result.

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; baseline for a parameterless tool is 4. No misleading parameter claims are present.

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?

Names the resource precisely (daily backups of the person's spaces to Google Drive) and enumerates exactly what the status report contains: connection state, on/off, hour, last result. An agent can tell this is a read-only status read, though it never names the sibling write tools (set_backups, disconnect_backups) to sharpen the distinction.

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 description gives clear context for when this is the right call (checking backup configuration state) and an actionable prerequisite: if Drive isn't connected, that is an OAuth consent the person performs in a browser at the given URL. It stops short of explicitly contrasting with set_backups or disconnect_backups.

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