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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, but the description adds valuable behavioral detail: 'Read-only, no auth' and 'No dollars are required.' It also discloses the ranking logic and the specific return payload, going beyond the annotation baseline without contradicting it.

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 compact and front-loaded with the core topic, then explains the mechanism, then enumerates return values. Every sentence adds useful information, with no filler or repetition of schema details.

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?

With no parameters and no output schema, the description carries the full burden of explaining what the agent will get back, and it does: rules wording, smallest first bid in ET10, dollar worth, and the ET10 price. It also covers access requirements and cost, making it complete enough to invoke 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?

The tool has zero parameters and the schema is empty, so there are no parameter semantics for the description to clarify. The description appropriately focuses on output and behavior instead, making the baseline score of 4 correct.

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 states a specific topic ('Feature Leaderboard: how bidding works') and lists the exact return values: rules wording, smallest first bid in ET10 and its dollar worth, and the ET10 price. It also distinguishes itself from sibling bidding tools by explicitly noting it is read-only, requires no auth, and no dollars are required.

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 clearly conveys that this tool is for understanding how feature bidding works and what the leaderboard ranks by, which gives a clear usage context. It does not explicitly name alternatives or state when not to use it, so it stops short of full routing guidance.

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