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

Annotations already declare destructiveHint=true, readOnlyHint=false and idempotentHint=true, so the lower bar applies. The sentence 'Its past history is kept' adds genuine non-obvious context by scoping exactly what destruction entails: the monitor goes away but recorded history survives, which an agent could not derive from the annotations alone. It does not cover behavior when no monitor exists for the URL, or permission requirements.

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 short sentences, front-loaded with the action and target, followed immediately by the one piece of non-obvious consequence. No filler, no restatement of the title.

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 single-parameter destructive toggle-off tool with an output schema and rich annotations, the definition covers what is needed: the action, the target, and the fate of history. The remaining gap is edge-case behavior (no existing monitor, auth/permission needs), which is minor but not zero.

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?

There is a single required parameter with 100% schema description coverage including format, examples, maxLength and a note on protocol inclusion. The description adds nothing beyond 'for a URL', so the schema does all the work and the baseline of 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?

The description pairs a specific verb ('Stop') with a specific resource ('score monitoring for a URL'), and the word 'score' implicitly separates it from the geo monitor siblings. It stops short of explicitly naming remove_geo_monitor or add_monitor as counterparts, so sibling 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?

There is no explicit when-to-use, when-not-to-use, or alternative routing. The agent must infer that this is the tool for ending score monitoring on a specific URL, and nothing tells it what to do instead when the target is a geo monitor or when the agent wants a temporary pause rather than removal.

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