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

Annotations already declare readOnlyHint and openWorldHint, so safety profile is covered; the description adds genuinely new behavioral context: upstream data sources (Census geocoder, FEMA NFHL, NOAA) and pay-per-call pricing ($0.03 USDC via x402, charged only on success). It omits failure behavior (e.g., unmatchable address) and latency, so not a 5.

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?

Front-loads the deliverable, then the sources, then the pricing in three compact clauses with no filler. Every sentence carries information an agent or caller needs.

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 correctly carries the burden of describing returns (flood zone, SFHA flag, active alerts) and adds cost and provenance. It is nearly complete but says nothing about partial results or behavior when the address cannot be geocoded.

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?

Only one parameter and schema coverage is 100%, so the schema already documents format and gives an example. The description reinforces the US-only constraint on the address but adds no syntax or validation detail beyond what the schema provides; baseline 3 is 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?

Names a specific verb+resource (hazard snapshot for a US street address) and enumerates exactly what is returned: FEMA flood zone with Special Flood Hazard Area status plus active NWS alerts. This is clearly distinguishable from every sibling (recalls, VIN, SEC filings, contractor lookups, provider verification).

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 'US street address' scoping gives clear context for when this tool applies and implicitly excludes non-US addresses, which is the main routing decision here. It stops short of naming when-not-to-use cases (e.g., non-US properties, or when only weather alerts are wanted) or any alternative tool.

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