sms_rental_quote

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. The duplicated '(free) (free)' hints that the call itself is free and non-mutating, but even that is ambiguous, and there is no mention of auth needs, rate limits, or whether inventory is checked live.

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 core clause is front-loaded and short, but the redundant '(free) (free)' repetition wastes space and creates confusion about what is actually free. It is compact but not clean, so it sits at the minimum-viable level.

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 should say more about what a quote returns (price units, availability format, currency). For a one-parameter pricing tool with no structured return contract, the single line leaves the agent under-informed.

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% and the single parameter is fully documented in the schema ('Omit to list every SKU'), so the schema already does the work. The description's '1 or 7 days' merely restates the enum values rather than adding format or pricing-tier meaning, so the baseline 3 applies.

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 a specific verb (quote) and resource (renting a US number) with a stated scope of 1 or 7 day terms, so the agent knows what it prices. However, it never distinguishes itself from close siblings like sms_quote, sms_pricing, or sms_rental_order, so an agent cannot route between them from this text alone.

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?

There is no explicit when-to-use guidance and no mention of alternatives. The presence of sms_quote, sms_pricing, sms_order, and sms_rental_order in the sibling list makes the absence of routing guidance a real gap, since only inference ('quote before order') suggests this tool.

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