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

Annotations already declare readOnlyHint=false, destructiveHint=false, and idempotentHint=false, so the safety profile is known. The description adds valuable context: the per-environment manual backup limit, the failure mode ('request fails and nothing is deleted'), and the returned operation_id. It stops short of explaining that the operation is asynchronous or how to poll for completion, but it goes well beyond the annotations.

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 description is tightly written and front-loaded with the operation type and purpose. The quota constraint, return value, and HTTP endpoint follow logically, with no redundant sentences. Every sentence 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 simple two-parameter write tool with no output schema, the description covers purpose, key behavioral constraints, return value, and endpoint. The only minor omission is guidance on using the returned operation_id, but the essential information for correct invocation is present.

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?

Schema description coverage is 100%, so both parameters are fully documented in the schema. The description mentions an optional note (the 'tag' parameter) but adds no syntax or format details beyond the schema. Baseline 3 is appropriate.

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 states a specific verb ('start a manual backup') and resource ('one environment'), with an optional note. It distinguishes itself from the read-only sibling kinsta_list_backups by explicitly labeling the operation as WRITE. An agent can identify the action without opening the schema.

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 does not say when to use this tool versus alternatives, such as whether a manual backup is preferred over automatic backups or how to check existing backups. It only describes the action and its quota constraint. There is no explicit when/when-not guidance or named alternative, so it is minimal.

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