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

With no annotations provided, the description carries the full behavioral burden. It discloses the critical one-time-only return behavior ('returned exactly once' and 'save it'), and the typical claimable delay. For a redeem/claim operation this is important non-obvious behavior.

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?

Three sentences, about 33 words, with the core action stated first and each following sentence adding essential context. No filler or repetition — efficient and front-loaded.

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 single-parameter tool with an output schema, the description covers the essential logic: the action, the prerequisite timing, and the one-time return behavior. It could be more complete with a pointer to checking order status first, but overall it equips an agent to call it correctly.

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?

With 0% schema description coverage, the description must compensate, but 'Takes the claim token' only restates the parameter name. It does not clarify the token's format, origin, where to obtain it, or how a user connects it to a prior buy_key order — leaving the only parameter under-specified.

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 clearly states a specific verb ('Claim') and a specific resource ('API key for a paid buy_key order'), distinguishing it from sibling tools like buy_key and key_order_status. It immediately conveys the action and the object acted upon.

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 description gives clear prerequisites and timing context — payments become claimable within 30 minutes of confirming on chain — which tells an agent when this tool becomes applicable. It doesn't explicitly name alternatives or when-not-to-use conditions, but the timing guidance effectively implies do-not-use-before-payment-settlement.

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