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

Annotations already cover read-only, non-destructive, idempotent behavior. The description adds valuable context beyond annotations by clarifying that the tool generates a similarity key, works across international formats, and explicitly discloses a cost of $0.01 USDC via x402. This helps the agent anticipate side effects and expectations.

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 at three sentences, front-loaded with the core action, then the behavioral scope, and finally the cost detail. Each sentence earns its place with no redundant filler or repetition of schema content.

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?

For a single-parameter tool with full schema coverage and annotations describing safety, the description covers purpose, international scope, and cost. The absence of an output schema means the exact return shape is not described, but 'similarity key' sufficiently implies the output for correct invocation.

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%, with the single parameter 'address' already documented as a 'Full international address string' and an example provided. The description adds no further parameter-specific semantics, so the baseline of 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?

The description uses a specific action ('Generate') and resource ('AI-powered similarity key') with an explicit scope ('global/international address matching'). This distinguishes it from siblings like interzoid_address_match_advanced and interzoid_address_parse, and the title 'Global Address Match Key' reinforces the unique focus.

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 phrase 'Handles international address formats and variations across countries' clearly signals when this tool is appropriate—for non-domestic or cross-country address comparison. It does not explicitly name alternatives or exclusions, but the global/international framing provides sufficient context for selection.

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