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

Annotations already cover the safety profile (readOnlyHint=true, destructiveHint=false, openWorldHint=false), so the bar is low. The description adds two useful things annotations cannot convey: an auth requirement (X-Agent-Key in the server-to-server header) and response redaction (webhook URLs and signing keys omitted), which tells the agent what it will not receive.

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 short sentences, zero filler, with the identifying scope front-loaded and the auth/response caveats following. Every sentence carries distinct information.

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?

There is no output schema, and the description compensates by noting which sensitive fields are withheld from the response. Combined with the auth requirement and the exact scope of the list, this is sufficient for an agent to call it correctly, though the shape of a returned watch record is still unspecified.

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 tool takes zero parameters, so there is nothing for the description to disambiguate and the baseline of 4 applies. The description correctly spends no words on parameter semantics.

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 (List) and a precisely scoped resource (this active agent DID's persisted Atlas incident watches), which separates it from the mutation siblings watch and watch_delete. It does not explicitly name those siblings or contrast with them, so it falls short of the top band.

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?

Use is implied: an agent needing to see its own persisted watches calls this. There is no explicit when-to-use, no statement of when this is preferable to watch_delete or watch, and no prerequisites beyond the header requirement.

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