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

The annotations already declare destructiveHint=true and openWorldHint=true, so the basic risk profile is covered. The description adds real value beyond them by disclosing the external side effect: subscribers of status pages showing the monitor are notified. It stops short of stating whether notifications can be suppressed or what permissions are required.

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, no waste. The primary action is front-loaded and the example and notification consequence follow in priority order.

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 non-idempotent mutation with an external notification side effect and no output schema, the description covers purpose, a canonical use case, and the notification consequence. Minor gaps remain: nothing on the returned identifier, on required permissions, or on what happens when a similar incident is already open.

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% with four documented parameters, including an enum for severity, so the schema carries the detail. The description only implies the monitor linkage ("for a monitor") and adds nothing about the title/description length limits or severity semantics. 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?

States a specific verb and resource ("Open an incident") plus the scope qualifier "by hand," which separates manual creation from the auto-generated incidents the rest of the vs_incidents_* family operates on. An agent can tell this apart from vs_incidents_update or vs_incidents_mark_resolved 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 "problem a customer reported that the checks have not caught" clause gives a concrete triggering scenario, which is useful implied guidance. However, it never says when not to use this tool or routes the agent to alternatives (e.g. vs_incidents_update to modify, vs_incidents_post_update to add updates to an existing incident) among the many incident siblings.

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