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

The annotations already declare readOnly, idempotent, non-destructive, and closed-world behavior. The description adds useful context: the output is approximate rather than authoritative, and the user should verify the date on their own notice. It does not cover permissions or rate limits, but those are less relevant for a read-only lookup.

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 front-loaded with the core purpose, followed by intent examples and a caveat. It is reasonably tight, though it repeats the title verbatim in the first sentence and spends a sentence on a reminder that could be folded in.

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?

With no output schema and only three optional parameters, the description does enough by stating it returns an approximate file-by date and decision timeframe. It does not detail the exact output shape, but for a simple read-only lookup the conceptual return description is adequate.

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%, so the schema already documents urgent, plan_type, and denial_date in detail. The description only reinforces that denial_date comes from the denial notice and that it yields an approximate file-by date, adding little beyond the structured fields.

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 computed output — appeal filing deadlines and the plan's decision timeframe — which is distinct from the sibling tools (rights, letter drafting, denial code explanation). It gives plain-language example questions so an agent can recognise the intent.

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 concrete trigger phrases ('how long do I have to appeal?', 'when is my appeal due?', 'how fast does my insurer have to answer?') and notes that a denial notice date should accompany the call. It does not name alternative tools or state when not to use this one, so it falls short of full routing guidance.

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