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

Annotations already cover readOnly, destructive, and idempotent hints, so "Idempotent" earns nothing. The description adds what the annotations cannot: that disabling closes open Incidents, halts Cycles, stops Fuel/plan consumption, and that the returned summary carries a Dashboard link for re-enabling. There is mild tension between closing Incidents and destructiveHint=false, but since the action is reversible via enable_monitor this reads as a state change rather than a contradiction.

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?

Purpose and effects are front-loaded in the opening clause, and the later sentences carry prerequisites and the recovery path rather than filler. The closing clause about "the link the returned summary carries" is slightly convoluted but still informative.

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?

With no output schema, the description does at least hint at a returned summary containing a Dashboard link, and it covers side effects and permissions well. However, the two required identifiers are left completely unexplained, which is the one thing an agent must get right to call this tool successfully.

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 0% and neither monitorId nor projectId is mentioned anywhere in the description. For a two-parameter tool whose schema is entirely bare, the description should at minimum indicate that monitorId identifies the target Monitor and projectId scopes it. That gap is unmitigated.

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 ("Disable a Monitor") and immediately enumerates the consequences: scheduled Cycles stop, Fuel/plan usage stops, open Incidents close. It never distinguishes itself from the close-by sibling delete_monitor, which is the main ambiguity an agent would face, but the described effects are concrete enough to separate it from update_monitor or get_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?

Gives the reverse operation (enable_monitor) and, more usefully, the access-level prerequisite: the tool is only present at "Read+Write+Execute" and below that the user must act in the Dashboard. That is real routing guidance. It stops short of saying when a caller should prefer delete_monitor or update_monitor instead.

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