Create in-app product

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

With no annotations, the description carries the full behavioral burden and discloses almost nothing: it does not say whether the product goes live immediately, whether an edit ID is required, what permissions/auth are needed, or what happens on SKU conflicts. Only the 'one-time purchase' trait is conveyed, which is arguably already implied by 'managed in-app product'.

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 front-loaded sentence with no filler or redundancy. It is efficiently structured, though the brevity is arguably a consequence of under-specification rather than disciplined editing.

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 complex mutation with 8 parameters (6 required), a nested object, 38% schema coverage, and no annotations or output schema, one sentence is not enough. Missing the edit/commit workflow context, required-field expectations, and the managed-vs-subscription distinction makes this incomplete 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 only 38% across 8 parameters, so the description is expected to compensate and does not. It says nothing about sku, packageName, defaultLanguage, the nested defaultPrice object (units/nanos/currency), or the status/purchaseType enums; the mention of 'one-time purchase' loosely implies purchaseType=managedUser but never states it, and in fact the enum also allows 'subscription', creating ambiguity.

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?

States a specific verb ('Creates') and resource ('managed in-app product'), and adds a clarifying parenthetical ('one-time purchase') that separates it from the sibling subscription tools (play_list_subscriptions, play_get_subscription). It does not explicitly name play_update_inapp_product or play_list_inapp_products as alternatives, so sibling differentiation is only implicit.

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 when-to-use guidance, no prerequisites, and no mention of alternatives such as play_update_inapp_product for existing products. Critically, it never mentions the Play edit-transaction workflow (play_create_edit / play_commit_edit) that most write operations in this family depend on, leaving the agent to infer it.

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