create_iap

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

With no annotations, the description carries the full burden of behavioral disclosure. It mentions idempotency, which is a useful trait, but omits critical details such as required permissions, side effects (e.g., does it submit for review?), reversibility, and expected response. This is a significant gap for a mutation tool.

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?

A single, tightly worded sentence conveys the core purpose and key constraints with zero waste. It is front-loaded with the action and resource, making it easy to scan.

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?

The tool is complex (10 parameters, 7 required, no output schema, no annotations), yet the description is minimal. It does not explain return values, prerequisites, approval flow, or behavior on duplicate calls beyond 'idempotently'. The description is insufficient for an agent to confidently invoke the tool without further information.

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%, so baseline is 3. The description adds meaning beyond the schema by clarifying that 'price_usd' is the USA store price and 'one-time purchase' reinforces the meaning of the type enum. This adds value without redundant repetition.

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 states a specific verb ('Create'), a precise resource ('in-app purchase'), and scoping details (idempotent, non-consumable or consumable, USA price). It clearly distinguishes from sibling tools like create_subscription, making the tool's purpose unambiguous.

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?

No explicit guidance is given for when to use this tool over alternatives such as create_subscription or set_iap_review_screenshot. The only contextual hint is 'Pro feature', which is too vague to guide usage decisions.

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