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

With no annotations, the description carries the disclosure burden. It discloses pagination, the accepted keyword forms, the full set of returned listing fields, and the important behavioral exception that an address/building returns a single property card and ignores `type`. Rate-limit and error behavior are absent, but the core behavioral surface is well covered.

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?

Four dense, front-loaded sentences with no filler: action and pagination first, then location semantics, return fields/exception, and use cases. It is well sized for a 59-parameter tool because the schema carries the detailed filter documentation.

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?

Despite no output schema and no annotations, the description compensates by naming the main returned fields and explaining the single-property-card case. For a large search tool, the use cases and sibling routing make it reasonably complete, though it omits pagination-count/default behavior and error-handling expectations.

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 baseline is 3. The narrative mostly re-states the `keyword` semantics and the `type` exception that already exist in the schema, and it adds no new information about `page`, `sort`, or the other filter parameters. It therefore earns no bonus beyond the well-documented schema.

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 opens with a specific, verb-driven statement: 'Searches Redfin for-sale, for-rent, or sold listings with pagination,' and enumerates the location forms and return fields. This makes the listing-search scope unmistakable and differentiates it from the single-property sibling endpoint.

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 gives concrete use cases ('real-estate market research, lead generation for agents, price/DOM trend analysis') and points to the 'Redfin Property endpoint' for deep-dive details, effectively routing an agent to the sibling after this search step. It does not phrase this as a hard when-not-to-use rule, but the guidance is unambiguous enough.

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