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

Goes well beyond the annotations by disclosing the rate limit (once a day), the async answer states ('done' with a stamp, or 'running' for a big site that joins the backup points on landing), and six distinct refusal modes. What it does not explain is why destructiveHint=true applies — whether the backup consumes quota, affects the live site, or overwrites anything — leaving one annotation unilluminated.

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?

Front-loads the action, then the outcome semantics, then the refusal list — a logical order with almost no filler. The refusal enumeration is telegraphic but each token earns its place as a distinct failure mode.

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, return-value detail is optional, yet the description still summarizes the two answer states, which is helpful. Coverage of purpose, rate limit, async behavior, and refusals is strong; the only omission is any note on prerequisites or why the call is flagged destructive.

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?

There is a single required parameter (serviceId) with 100% schema description coverage, so the schema already carries the semantics. The description never references serviceId or adds constraints such as what makes a service eligible (must be live WordPress), 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?

States a specific verb and resource: 'Take a backup point of a live WordPress site.' The scope qualifiers (live, WordPress, once a day) make the operation precise. It does not explicitly distinguish itself from siblings like list_backups or rollback, so it falls just short of 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?

Gives clear operating context: once per day, only for a live site, and enumerates the exact refusal conditions (too-soon, busy, not-live, migration-open, deploy-open, failed) that tell the agent when the call will not succeed. However, it never names an alternative tool (e.g., list_backups to inspect existing points or rollback to restore), so routing guidance is implied rather than explicit.

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