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

The annotations already state readOnlyHint, idempotentHint and destructiveHint=false, and the description adds useful behavioral context: the 1–365 day window, the default of 90 days, and the exclusion of health-related policies. Return format is not described, but that is a minor gap for this simple read tool.

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 tight sentence that front-loads the resource, scope, date range and exclusion with 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?

For a one-parameter read-only tool with no output schema, the description supplies the key operational facts: scope, date window, default, and exclusion. It lacks output details such as whether renewal dates include policy identifiers, but nothing critical to correct invocation is missing.

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 coverage is 0%, so the description must compensate. It does so well by explaining that 'days' is a 1–365 range with a default of 90 and by stating what the window means. It does not elaborate on behavior when omitted beyond the default, but the parameter is simple and fully usable.

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 ('List') and resource ('renewal dates') and scopes it to home, car and business policies, with an explicit exclusion for health-related policies. It does not explicitly differentiate itself from the sibling list_policies tool, which keeps it 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?

The intended use is clearly implied by the focus on renewals and the health exclusions, but there is no explicit guidance on when to choose this over list_policies or when not to use it.

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