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

Annotations already establish this is a non-read-only, non-destructive mutation, so the safety profile is covered. The description adds that the operation is a daily-schedule toggle but says nothing about side effects of disabling (are existing backups kept? does the schedule resume from today?), which is the main behavioral question for a toggle.

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?

A single efficient sentence with no filler, and the core action is front-loaded. It is appropriately sized for a simple toggle, though it leaves room for one clarifying clause about sibling scope.

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?

The tool is simple, params are fully documented in the schema, and there is no output schema to explain. Still, for a mutation tool the definition omits whether disabling affects existing backups and how it relates to the manual backup/restore siblings, leaving meaningful gaps an agent would want closed.

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 the schema already documents enabled, serviceId, and the retentionDays floor/default behavior. The description adds no parameter detail at all — notably it never mentions retentionDays, which is the one parameter with non-obvious constraints. Baseline 3 applies when the schema carries the load.

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 pair ('Enable or disable') and resource ('daily automated backups for a database service'), which is more precise than the name alone. However, it does not distinguish itself from closely related siblings like nexusai_db_backup (on-demand backup) or nexusai_db_restore, leaving the agent to infer the schedule-vs-manual 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?

No when-to-use or when-not-to-use guidance. It never says when an agent should toggle the schedule versus taking an on-demand backup with nexusai_db_backup, nor mentions any prerequisites (e.g., service must exist, must be running). The 'daily' cadence is the only implied usage context.

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