Create domain expiry monitor

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

The description adds meaningful behavioral context beyond annotations by disclosing the WHOIS data source and the registration-vs-certificate distinction. It aligns with readOnlyHint=false (creating a monitor) and does not contradict annotations, though it doesn't detail side effects beyond creating the monitor.

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 three sentences, front-loaded with the central purpose, and every sentence earns its place: it states the function, explains the unique value, and distinguishes from the closest sibling. No wasted words.

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 presence of a full input schema, output schema, and annotations, the description provides sufficient context for selecting the tool and understanding its domain. It could mention the alerting/expiry threshold behavior, but that is not essential 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?

The input schema provides 100% coverage with descriptive parameter documentation, so the description doesn't need to add param-specific details. It adds no extra parameter semantics beyond what the schema already supplies, justifying the baseline score.

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 uses a specific verb ('watch') and resource ('domain registration'), explicitly states it reads from WHOIS, and clearly distinguishes it from create_ssl_monitor by contrasting registration vs certificate expiry.

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 provides explicit guidance on when to use this tool: to monitor domain registration expiry, and explicitly names the alternative (create_ssl_monitor) with a clear rationale for why both may be needed. It also explains why uptime checks are insufficient.

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