purchases_products_acknowledge

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

With no annotations, the description carries the full behavioral burden. It does disclose a valuable, non-obvious trait — unacknowledged purchases are refunded by Play after 3 days — but says nothing about auth requirements, idempotency of repeated acknowledgements, or failure modes for an invalid/already-consumed token.

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?

Two sentences, zero filler, with the action first and the consequence second. Every clause earns its place.

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 mutation tool with no annotations and no output schema, the description establishes purpose and the key business risk but omits authentication/permission context, idempotency behavior, and what the call returns on success. Adequate but with clear gaps.

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 75% with token, productId, and packageName documented in the schema; the description adds no parameter-level meaning. developerPayload remains undocumented in both schema and description, so the description does not compensate for the gap.

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 (acknowledge) and resource (one-time product purchase), and the qualifier 'one-time product' implicitly separates it from purchases_subscriptions_acknowledge. It stops short of naming the sibling or the consume alternative explicitly, so differentiation requires light inference.

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 refund-after-3-days consequence strongly implies urgency and why an agent should call this, but there is no explicit when-to-use guidance, no mention of purchases_products_consume for consumables, and no stated prerequisites. Usage is implied rather than directed.

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