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

No annotations exist, so the description carries the full burden; it does disclose the geographic scope of the check and the two possible outcomes (inside launch area vs. waitlist-eligible), which is real behavioral context. However, it says nothing about the response shape, error behavior for malformed or out-of-state addresses, or whether the call has side effects (e.g., actually adding someone to a waitlist).

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?

One front-loaded sentence with the decision criterion and the geography stated immediately. No filler or repetition.

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 annotations and no output schema, the description should say what a result contains and whether the call is read-only or has side effects. It covers the input question well but leaves the return value and resolution status of out-of-area addresses unexplained, which is exactly what a caller of an eligibility gate needs.

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 100% and the single parameter carries its own format examples, so the description adds no parameter-level detail. Baseline 3 applies when the schema does all the work.

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?

States a specific verb ('Check') and resource ('street address') with the precise decision being made: in-area vs. waitlist-eligible, naming the geography (Hamilton County, TN / Chattanooga). It does not explicitly contrast with the closely related siblings join_waitlist or suggest_addresses, so it falls short of full sibling differentiation.

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?

Usage is only implied by the phrase 'eligible to join the expansion waitlist,' which hints that join_waitlist is the follow-up action, but the description never says when to call this versus join_waitlist or suggest_addresses. An agent must infer the workflow ordering.

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