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

With no annotations, the description carries the behavioral burden. It usefully discloses that the cap-rate band is modeled and lists the returned data categories, but it does not describe permissions, data freshness, error behavior for invalid zips, or response structure.

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 question and then compactly lists the profile contents. It is appropriately sized for a one-parameter lookup tool with no wasted language.

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 no annotations, the description does a good job enumerating the return categories and the canonical URL. It stops short of explaining response format, data sources, or error conditions, but it is sufficiently complete for an agent to understand what the tool returns.

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%, so the single zip parameter is already fully documented in the schema. The description adds no syntax or format detail beyond what the schema provides, making the baseline score appropriate.

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 and scope: a full rental-market profile for a single US zip code, and it enumerates the included data categories. It is clearly distinguishable from multi-zip or trend-focused siblings by the 'single US zip' scope, though it does not explicitly name any alternative tool.

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 implied use case is clear from the opening question and the single-zip scope, but the description gives no explicit when-to-use or when-not-to-use guidance. It does not mention compare_zips, rent_trend, search_markets, or top_markets as alternatives.

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