start_monitoring_signup

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

Annotations already indicate readOnlyHint, idempotentHint, and destructiveHint false, and the description richly expands on this by stating that nothing is created, no email is sent, the domain is only carried over after the human signs in, and monitoring starts only after TXT ownership proof. It also clearly instructs how to relay signup_url and message, with no contradiction to annotations.

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 description is long but front-loaded with clear usage conditions and each sentence carries important operational detail, especially the verbatim signup_url printing instruction. It could be tightened slightly, but the density is justified by the security-sensitive nature of handing off to a human.

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 one-parameter tool with rich annotations and no output schema, the description is fully sufficient: it states when to trigger it, what the call returns, what the call does not do, what the agent must relay, and the ownership-verification flow. No critical operational information is missing.

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 coverage is 100% and the parameter description already explains domain format, punycode normalization, and that schemes/paths/ports are invalid. The tool description adds the fact that the domain is carried over to the dashboard later, but this is not needed to invoke the single parameter correctly.

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 names a precise set of user intents (DMARC monitoring, RUA report monitoring, new-sender monitoring, alerts, DNS monitoring, DNS Doctor trial) and states that the tool returns a sign-up link for a human domain owner. This clearly distinguishes it from sibling tools that scan, validate, or manage DNS records.

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 explicitly says when to use it: when the user wants monitoring or at the end of a scan that found issues on a user-owned domain. It also clarifies what the tool does not do (creates nothing, sends no email, does not sign in), but it does not name alternative sibling tools or give explicit conditions for choosing them instead.

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