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

With no annotations, the description carries the full behavioral burden. It conveys a read-only price snapshot and defines the two returned values, but it never explicitly states that the call has no side effects and does not address edge cases or response shape.

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?

A single sentence, front-loaded with the core question ('What a rank costs right now') and no filler. Every phrase contributes either the timing or the definition of the prices.

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 zero-parameter read-only tool, the description explains the main output values well enough to know what the call returns. It leaves exact output formatting and the relationship to bid_for_rank to inference, but no invocation arguments are needed.

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 schema coverage is 100%, so the no-argument requirement is already clear. The description adds meaning by defining the price semantics, which satisfies the 0-parameter 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 names a concrete query: the current cost of a rank, specified as the cheapest bid that enters the Board and the bid at the top. This distinguishes it from action-oriented siblings like bid_for_rank, though it does not explicitly call out the distinction.

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?

No usage guidance is provided. The description does not state when to use this tool versus bid_for_rank, dry_run, or get_leaderboard, so the agent must infer its role as a pre-trade price check.

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