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

With no annotations, the description carries the full load. It usefully discloses the pricing/auth model ('one-time trial, tier allowance, or x402 $0.002') and the verdict vocabulary, but as a state-writing tool it says nothing about idempotency, whether re-judging overwrites prior judgments, or what 'binding' means operationally (e.g., does STOP-SOURCE halt further ingestion?).

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 tight sentences, front-loaded with the action and output vocabulary, followed by billing. Nothing is wasted, though the billing phrase assumes prior context the reader may not have.

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 6-parameter stateful tool with no annotations, no output schema, and zero schema descriptions, the definition is thin. It substitutes for the missing output schema by naming verdict values, but two parameters and the mutation semantics are undocumented, and the relationship to futility_verdict/futility_receipt is unstated.

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 0%, so the description must compensate. It explicitly maps only run/source/domain and implies label's allowed values ('useful / useless / partial'), leaving 'query' and 'tokens' completely undefined and no format guidance for the required IDs.

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 and resource ('Record one usefulness judgment') with the allowed label values spelled out, plus the return artifact ('binding verdict'). It is clear what the tool does, but it never names how it differs from the sibling futility_verdict or futility_receipt, so sibling differentiation is left to 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?

There is no explicit when-to-use guidance: no mention of when a judgment should be recorded versus fetched via futility_verdict or receipted via futility_receipt. The billing sentence describes cost mechanics, not usage conditions, so the agent must guess the workflow context.

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