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

With no annotations, the description carries the full behavioral burden. It discloses that settlement is two-part, involves a 15% share, and that replay is refused (idempotency), which is useful. But it omits permissions, side effects, reversibility, and the meaning of '15% share', leaving significant 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 single sentence is front-loaded with the core action and contains no filler. The parenthetical is dense and slightly cryptic, but it is not wasteful.

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 tool whose behavior is complex enough to involve two-phase settlement, a share mechanism, and replay refusal, the description is far too brief. With no annotations and no output schema, it should explain prerequisites, side effects, and expected outcomes, but it does not.

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?

The tool has zero parameters and an empty input schema, so there is nothing for the description to clarify. Per the baseline rule for 0 params, a 4 is appropriate.

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 ('Settle') and resource ('event'), making the basic action clear. However, it does not differentiate from sibling tools such as 'open_event', leaving the agent to infer the lifecycle relationship.

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 prerequisites, and no named alternatives. The parenthetical 'two-part, 15% share; replay refused' describes behavior but does not help an agent decide when to select this tool over siblings.

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