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

With no annotations provided, the description carries the burden of behavioral disclosure. It discloses that the tool is paid ('PAID (~$0.01)'), returns forward-looking data unavailable in training data, and only covers Epic Games Store. It does not detail failure behavior or the exact x402 payment proof mechanics beyond the schema, leaving minor gaps.

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 description is front-loaded with 'USE THIS when...' and packs triggers, return summary, storefront limitation, and cost into four sentences. The 'no training data' line adds useful context for an AI agent, and there is minimal fluff, though it is slightly longer than the most compact examples.

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?

There is no output schema, so the description needs to convey return content; it does so by stating the tool returns upcoming giveaways with claim dates and normal costs. It also covers scope ('Epic Games Store only') and cost, making it sufficiently complete for a simple query tool, though it omits explicit output structure and error behavior.

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 for the single parameter is 100%, as the schema already describes 'payment_proof' as 'x402 payment proof.' The description adds useful context that the tool is paid and cheaper than an alternative, explaining why payment_proof is needed, but it does not elaborate on the proof format or acquisition method, so it meets but does not exceed the baseline.

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 the tool's purpose: 'Returns giveaways already announced but not yet started, with the exact date each becomes claimable and what it normally costs.' It also provides explicit trigger phrases like 'what games will be free next' and distinguishes itself from siblings by noting 'Epic Games Store only.'

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 opens with 'USE THIS when asked what games will be free next, what is free next week, or what giveaways are coming up,' giving explicit usage triggers. It also provides an exclusion ('Currently Epic Games Store only') and a comparative alternative ('cheaper than get_free_games'), helping the agent choose between tools.

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