Everything needed to place a bid: the endpoint, the exact payload, the price of the rank you want, and the spend-cap trap that blocks most agents. Call this before bidding. This server never handles private keys — your own x402 client signs the payment.
| Name | Required | Description | Default |
|---|---|---|---|
| agent_name | No | ||
| target_rank | No |
Changes observed during successful MCP inspections.
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the burden of behavioral disclosure. It adds meaningful context: the server never handles private keys, and the agent's x402 client signs the payment. It also hints at a known pitfall ('spend-cap trap'), which is valuable behavioral guidance, though it does not fully describe returns or side effects.
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?
Three sentences, no wasted words, and the critical guidance is front-loaded. It conveys scope, timing, and security posture efficiently.
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 no output schema and no annotations, so the description must explain both inputs and behavior. It covers the tool's purpose, key trap, and security model, but leaves parameter semantics unexplained and does not describe what the tool returns. This is adequate for a how-to guide but has clear gaps.
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 0%, so the description must compensate. It only loosely maps to one parameter via 'the price of the rank you want' (target_rank), while agent_name is entirely unaddressed. No parameter formats, optionality, or usage examples are provided.
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 immediately states the tool's purpose: 'Everything needed to place a bid.' It is specific about the resource (bidding) and what it provides: endpoint, exact payload, rank price, and spend-cap trap. It also distinguishes itself from siblings by explicitly positioning itself as the pre-bidding guide.
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 instruction 'Call this before bidding' gives a clear, explicit usage trigger. It does not name alternatives or say when not to use it, but among the arena_* siblings it is clearly the informational precursor, so the context is largely unambiguous.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
