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

Annotations already declare readOnlyHint and idempotentHint, so safety is covered. The description adds valuable behavioral details: the sort order (newest first) and the fields returned (what it watches, what it does, last fired time). It does not contradict annotations, and the auth/scope requirement is disclosed, going beyond the structured hints.

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?

The entire description is one concise sentence that front-loads the core purpose and immediately lists key output attributes. There is no fluff, and every word earns its place. The format is ideal for an agent to quickly parse and act on.

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?

Given no parameters and no output schema, the description is sufficiently complete: it states what is returned, the order, and the required scope. It does not mention pagination or limits, which might be expected for a list tool, but that is a minor gap and not critical for correct invocation.

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?

This tool takes zero parameters, so the schema coverage is trivially complete and there is nothing for the description to explain about parameters. The baseline for zero parameters is 4, and the description appropriately avoids filler; it also hints at output semantics without needing param-level details.

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 clearly states the tool lists saved monitors (standing watches) with explicit output details: what each watches, what it does, and when it last fired. It uses a specific verb (list) and resource (monitors), distinguishing it from sibling tools like create_monitor or delete_monitor by its read-only listing purpose.

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 description provides clear context for when to use this tool (to see saved monitors) and notes the prerequisite of authentication and the monitors:read scope. However, it does not explicitly name alternatives or exclusion conditions, so it falls short of the highest rating which requires explicit when-not or alternative routing.

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