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

The description goes well beyond the annotations by disclosing that API-created monitors are always disabled, that nothing on this surface can enable them, that enabled monitors consume fuel on a schedule, and that the returned summary carries the Dashboard link for enabling. These are non-obvious behavioral traits an agent needs to know.

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 dense sentences, each earning its place: the first states the core behavior, the second explains the fuel consequence and where enabling happens, and the third directs the agent to prerequisite knowledge. No filler or repeated schema content.

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 complex 9-parameter tool with a nested thresholds object and no output schema, the description covers the key cross-cutting behaviors, mentions the important returned artifact (the link in the summary), and points to the monitoring topic for nuanced choices. Combined with the detailed schema descriptions, nothing essential is missing 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?

Schema description coverage is 89%, so the input schema already documents the parameters thoroughly. The description's only parameter-related contribution is advising the agent to read the 'monitoring' topic before choosing frequency or thresholds, which adds a small layer of guidance but does not materially improve parameter understanding beyond the schema.

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 states a specific verb and resource — 'Create a Monitor in a project' — and immediately adds the defining qualifier that the monitor is always disabled, which clearly distinguishes it from update_monitor, delete_monitor, and disable_monitor. This leaves no ambiguity about what the tool does.

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 gives clear context that this tool creates monitors in a disabled state and that enabling can only happen through the user's Dashboard act, which prevents an agent from trying to enable a monitor after creation. It does not explicitly name sibling alternatives like update_monitor, but the context is sufficient to guide correct use.

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