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

Annotations already mark this as a non-readOnly, non-destructive, closed-world mutation, so the safety profile is covered. The description adds genuinely new behaviour: the backup completes "within minutes" rather than synchronously, and list_backups is the way to confirm it. It stops short of saying whether repeated calls create duplicate backups or what happens if the service is mid-operation.

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, zero filler, with the core action and the timing expectation front-loaded before the verification pointer. Every clause carries information an agent would otherwise have to guess.

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 one-parameter, no-output-schema mutation with annotations covering safety, the description supplies what an agent needs: when to invoke it, how fast it finishes, and how to check. The only gap is the return value of the call itself and any guard conditions on the service's state.

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 exactly one required parameter and schema description coverage is 100%; the schema already says "The service id, from list_services". The description adds nothing about the parameter, so baseline 3 applies — the schema does all the work here.

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?

"Take a backup now" states a specific verb (take a backup) and an implicit resource (the service referenced by id), matching the tool name. It is clearly distinct from restore_backup and list_backups, though it never explicitly names those neighbours as the paths not taken.

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?

"for example before a risky change" gives a concrete triggering situation for an on-demand backup rather than relying on a schedule. It also routes the agent to list_backups for verification. No explicit when-not-to-use or prerequisite (e.g. service state) is given, keeping it short of a 5.

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