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

Annotations already declare readOnlyHint=true and idempotentHint=true, covering safety and repeatability. The description adds meaningful behavioral detail by specifying the verification logic: IBAN checksum validation, country alignment, and a pre-viewing flag. It does not contradict annotations and gives agents a clearer idea of what the guard evaluates.

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 a single compact sentence, front-loaded with the rental deposit context. Every element maps to a parameter or check, and there is no wasted wording.

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 read-only three-parameter tool with full schema descriptions, an example, and an output schema, the description and structured fields are largely sufficient. The main gap is the lack of explicit guidance on when to choose this over related rental or validation siblings.

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 already met. The description adds value by linking deposit_iban to checksum validation, property_country to country alignment, and deposit_before_viewing to the pre-viewing flag, clarifying how each parameter participates in the tool's logic.

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 names the domain and the specific checks performed: IBAN checksum, property/deposit country alignment, and pre-viewing flag. It distinguishes this from generic IBAN validation by tying it to rental deposit safety, though it lacks an explicit verb like 'validates' or 'assesses'.

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 'Rental deposit safety' gives clear domain context, and the listed components imply the conditions it evaluates. However, it does not explicitly say when to prefer this tool over siblings like iban_check, rental_listing_risk, or rental_verdict, so routing is partly left to inference.

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