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

readOnlyHint=true already declares the safety profile, and the trailing 'Read-only' merely repeats it. The real added value is the inventory of returned fields (kind, severity, cluster, source, filters, destination, priority, mode, stop-on-match, enabled), which matters because no output schema exists to convey the return shape.

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?

One front-loaded sentence that leads with verb and resource, then lists fields. No filler beyond the redundant 'Read-only' clause, which duplicates the annotation rather than adding information.

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 read tool with no output schema, the field enumeration is exactly the missing piece — it tells the agent what a successful call returns. Only the lack of guidance about error behavior for an unknown route_id keeps it from being fully complete.

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?

With schema description coverage at 100% for the single required parameter, the schema already documents route_id as a UUID sourced from list_notification_routes. The description adds nothing about the parameter, so the baseline 3 applies.

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 and resource ('Read one notification route') and enumerates the configuration fields that constitute the record, so an agent knows this is a single-record fetch rather than the sibling list_notification_routes. It never names the sibling explicitly, so differentiation is inferred rather than stated.

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 phrase 'Read one notification route' plus the schema note that route_id comes from list_notification_routes implies the lookup-by-id use case. There is no explicit when-to-use guidance, no mention of when to prefer this over list_notification_routes, and no prerequisites (e.g. existence checks) stated.

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