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

The annotations (readOnlyHint false, idempotentHint false, etc.) only indicate side effects, but the description adds key behavioral context: alerts are suppressed while monitors keep running, and the window is one-time. This goes beyond the structured flags, though it does not mention issues like overlapping windows or permissions.

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 the purpose, followed by a usage hint. Every clause adds value and there is no redundancy or unnecessary detail.

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 create-style tool with 7 parameters, the description covers the core behavior, the temporal scope, and a common use case. The presence of a detailed input schema and output schema means the description does not need to enumerate return values or every constraint. It is complete for an agent to select and invoke correctly.

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 baseline is 3. The description references starts_at and ends_at, but the schema already explains each parameter in detail, including 'from list_projects' and 'Monitors whose alerts to suppress.' The description does not add significant meaning beyond the schema.

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 action and resource: 'Schedule a one-time maintenance window.' It further clarifies the effect by explaining that 'the listed monitors keep running but their alerts are suppressed between starts_at and ends_at,' which clearly distinguishes it from sibling tools like pause_monitor and create_monitor.

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?

It provides clear usage context with 'Use before deploys or planned downtime,' which tells the agent when to invoke this tool. It does not explicitly name alternative tools or exclusion scenarios, but the context is strong enough to differentiate from pausing or creating monitors.

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