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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is fully covered and the description's bar is lower. The description usefully discloses the substantive content returned (rate-setting mechanism, payer of the owner's policy, a sample premium), but says nothing about error behavior or what happens for unsupported states.

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?

Compact and front-loaded: jurisdiction marker first, then the three content points, then coverage limits. Every clause carries information, though the covered-states list would read better as an explicit constraint on the `state` argument.

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 single-parameter read tool with no output schema and full annotation coverage, this is adequate: it says what data comes back. The unresolved conflict between "any of the 50 states" in the schema and the four-state coverage list is the main gap an agent would hit at call time.

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% for the single `state` parameter, so the baseline is 3. The description does add genuine scope information ("Covered states: Florida, Iowa, New Mexico, Texas"), but that directly tensions with the schema's claim of "any of the 50 states," leaving the agent unsure which states actually work rather than resolving the ambiguity.

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 resource (US title insurance rate-setting) and enumerates the exact questions answered: promulgated vs. filed rates, who pays the owner's policy, and a premium example. It is clearly distinguishable from sibling tax tools like transfer_tax_us or closing_costs_us, though it never names a sibling explicitly, which keeps it at a 4 rather than 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?

Scope is implied rather than stated: the leading "UNITED STATES." marker and the covered-states list tell the agent this is a US-specific lookup, but there is no when-to-use/when-not-to-use guidance and no pointer to alternatives for non-covered states or for related cost questions (closing_costs_us, transfer_tax_us).

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