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

Annotations already declare idempotentHint=true, openWorldHint=true, non-destructive and non-readOnly, so the safety profile is covered. The description adds no behavioral context beyond repeating 'start watching' – it doesn't say what resuming affects, whether alerts/notifications restart, or what side effects occur.

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, front-loaded sentence with zero waste. It is concise, though it could trade some brevity for the missing precondition and side-effect 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?

Against an output schema and full annotation coverage, the description is adequate only in the narrowest sense. It omits the paused-state precondition, side effects of resuming, and routing to sibling resume/pause tools, leaving real gaps for a state-changing tool.

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 coverage is 100% and the itinerary_id parameter is fully documented in the schema, including where to obtain it, so the description needn't repeat it. Baseline 3 applies; the description adds no additional parameter meaning.

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 ('Start watching ... again') and resource ('a paused route'), distinguishing it from pause_itinerary and resume_alert by naming the paused-route scope. However, it conflates 'route' with 'itinerary' terminology used by the schema and siblings, which blurs the object it acts on.

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 guidance, no prerequisites, and no reference to alternatives like resume_alert or resume_all_alerts. It also fails to state that the target must currently be paused, which is the essential precondition.

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