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

Annotations already provide readOnlyHint, idempotentHint, and destructiveHint, so the safety profile is known. The description adds valuable behavioral context beyond annotations: it explains that Monitors are scheduled low-volume checks, that each execution is a Cycle, and that rows are summaries without thresholds/engine ids. It also directs to documentation for lifecycle behavior, which is useful. No 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?

Three sentences with no redundancy. The core action is front-loaded, the domain context is concise, and the pointer to get_monitor and documentation is placed at the end. Every sentence adds value.

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 simple list operation with one parameter and no output schema, the description is nearly complete: it covers scope, summary-level result, and how to get more detail. It does not describe pagination, sorting, or the exact fields returned, but those are typically minor for such a tool and the pointer to get_monitor fills the main gap.

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?

The single parameter projectId is obvious from the description ('in a project') and the required field name is self-explanatory. However, schema description coverage is 0%, and the description does not specify the format or constraints of projectId (e.g., is it a UUID or name?). Since there is only one parameter and its role is clear, the 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 ('List the Monitors in a project'), defines the domain concept (Monitor/Script/Cycle), and clearly distinguishes itself from get_monitor by noting each row is a summary. This differentiates it from sibling tools like list_monitor_cycles and get_monitor without ambiguity.

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 clearly implies when to use this tool: when you need a summary list of Monitors in a project, and explicitly points to get_monitor for full configuration. However, it does not explicitly state when not to use it (e.g., for cycles or incidents), though the context makes this reasonably clear.

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