Get Monitoring Signup Link

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

The description adds substantial context beyond the readOnly/idempotent annotations: it states the call creates nothing, sends no email, the domain is filled in on the dashboard after sign-in, and monitoring starts only after DNS ownership proof. It also instructs the agent to show the returned signup_url as a link with the message.

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 front-loaded with usage and exclusions, and every sentence carries useful information. The first sentence is quite long and enumerates many monitoring categories, but it remains purposeful rather than redundant.

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 one-parameter signup-link tool with annotations covering the safety profile, the description supplies everything needed: when to use it, what it returns, that it has no side effects, and what the user must do next. No output schema is present, but return fields are explained.

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 100%, so the schema already defines the only parameter in detail. The description adds only the ownership framing ('a domain they own') and no additional syntax or format guidance 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: get a signup URL for ongoing monitoring. It distinguishes the tool from one-off check tools by explicitly excluding 'a one-off question about whether a site is down right now.' An agent can tell what this tool does and how it differs from the check_* siblings.

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?

It gives clear when-to-use conditions (ongoing DMARC, RUA, new-sender, email-auth, DNS, or uptime monitoring) and an explicit when-not condition (one-off site-down question). It does not name a specific alternative sibling for the one-off case, so it stops short of full alternative routing.

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