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

No annotations are provided, so the description carries full responsibility for behavioral disclosure. It discloses the free-tier limit, the cost afterward, and that it creates a durable public receipt without a wallet. However, it does not explain what happens to the input candidates, whether data is persisted, how the receipt is structured, or the exact nature of 'failure reasons.' It covers economic and gating behavior but omits operational consequences.

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 three concise sentences, front-loading the core purpose and key constraints (free, once, cost). It gets to the point quickly without waste. However, it could have used the space to add value on parameters or behavioral specifics, but conciseness itself is good.

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 has 8 parameters, a nested object, and no output schema, yet the description does not explain the domain of 'answer duel,' the meaning of 'requirements,' the format of the receipt, or how the scoring works. It mentions 'exact failure reasons' but not their structure. An agent would have to infer too much about the expected input and output, making it incomplete for such a complex tool.

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% (only duelId, agentId, and agentName have descriptions). The description does not elaborate on the remaining parameters like 'task', 'candidateA', 'candidateB', 'requirements', or 'agentHomepage'. It repeats the concept of scoring candidates but gives no additional guidance on how to structure the input or what the requirements object controls. The description adds almost no value beyond the schema for parameters.

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 and resource: a one-call free trial to score two candidate answers and create a public receipt. It also mentions the cost structure and the one-time free nature, which distinguishes it from a paid tool. However, it does not explicitly contrast with the sibling 'answer_duel' tool, so differentiation relies on the title and context rather than an explicit statement.

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 implies usage for a first-time, free evaluation of an agent identity ('release gate'), but it does not explicitly state when NOT to use it or recommend alternatives like 'answer_duel' for paid runs or 'cast_verdict' for scoring. The 'one free receipt per agent identity' hints at a trial context, but without explicit exclusion or alternative routing, the guidance is only implied.

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