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

With no annotations, the description carries full behavioral burden. It does disclose one useful trait: the check uses live SES and DNS observations, implying external calls, latency, and possible failure if DNS is misconfigured. However, it does not state whether 'Refresh' mutates stored state, whether it is idempotent, or what happens on failure.

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?

A single efficient sentence with zero filler; verb, resource, and data source are all front-loaded. The phrasing 'real ... observations' is slightly awkward but every word earns its place.

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 2-param tool with 100% schema coverage and no nested objects, the input side is complete. However, with no output schema, no annotations, and a sibling set containing the similar-sounding domain_smoke and domain_report, the description leaves the agent uncertain about expected return values and how this differs from nearby domain tools.

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%, with both domain_id and organization_id clearly described. The description adds no parameter-level meaning, but the baseline of 3 applies because the schema already documents both inputs adequately.

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 specific verb ('Refresh'), a specific resource ('domain readiness'), and a distinguishing source ('real SES and DNS observations'). This separates it from siblings like domain_get (fetch stored data) and domain_report (generate a report). The noun 'readiness' is slightly vague, keeping this from a 5.

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?

No explicit when-to-use guidance, exclusions, or named alternatives. Given the crowded domain-tool sibling set (domain_get, domain_report, domain_smoke, domain_deliveries), an agent gets no help choosing this over a smoke test or a readiness report. Usage is only weakly implied by the word 'Refresh'.

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