start_monitoring_signup

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

The description fully discloses the tool's read-only behavior, aligning with annotations (readOnlyHint, idempotentHint). It details the sequence: returned URL leads to sign-in page, domain is carried over after sign-in, monitoring starts after TXT proof. No contradiction with 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 well-structured and front-loaded with the tool's purpose. While it is somewhat lengthy due to the step-by-step explanation, every sentence serves a purpose and no content is 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?

Given the simplicity (1 parameter, no output schema, clear annotations), the description is complete. It covers the return value (signup_url and message), the process, and important caveats, leaving no ambiguity for an AI agent.

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 description adds valuable context to the 'domain' parameter beyond the schema: it shows examples, explains accepted forms (bare registrable names and subdomains), and explicitly excludes scheme, path, or port. It also mentions Unicode normalization.

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 clearly states the tool returns a sign-up link for a domain owner to start monitoring, distinguishing it from siblings that perform scanning or record checks. It specifies 'Nothing is created and no email is sent', clarifying it initiates a human-led process.

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 instructs the agent to hand the URL and relay the message to the human, and warns 'never sign in on their behalf'. It explains the flow after the URL is used, providing clear when-to-use context.

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