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

The annotations already establish read-only, idempotent, and non-destructive behavior, and the description does not contradict them. It adds useful behavioral context by disclosing that the score is a weighted composite of named government/climate/grid datasets and that a higher score means LOWER risk, which is non-obvious.

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 compact and front-loaded: the core purpose is in the first sentence, and each following sentence adds a distinct piece of value—data sources, scoring interpretation, profile tuning, and output. No filler or repetition exists.

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, the description compensates by stating the 0-100 score, the risk direction, the dependence on site_profile, and the underwriting_hint return. It leaves minor gaps around exact response shape and zip input format, but for a two-parameter read-only composite, the coverage is strong.

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 0%, so the description must carry parameter meaning. It does: 'US ZIP' clarifies the zip field, and the site_profile enum values are repeated with the explanation that they tune the risk weighting. It could add zip format details or profile effect specifics, but both parameters are meaningfully addressed.

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 by naming the resource and subject exactly: 'Physical-location risk composite for a US ZIP.' It then specifies the data sources, score range, profile tunings, and the underwriting_hint output, making its purpose unmistakable and distinguishing it from sibling geo/weather/address lookups.

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 description gives clear usage context by listing the four site profiles and noting that the result includes an underwriting_hint, implying underwriting and site-selection use cases. However, it does not explicitly name alternative tools or state when this tool should not be used, so it stops 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.