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

With no annotations, the description carries the full behavioral burden and does so thoroughly: it discloses the x402 payment gate (X-Payment header, 0.02 USDC per minute-block on Base), the FREE 404 refusal for unknown matches before the gate, and fail-soft audio where text always ships. These are exactly the auth, cost, and failure behaviors an agent needs.

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?

Front-loading is good ([FREE] and the free endpoint come first), but the entry is dense with four URLs and mixes the access model, pricing, audio behavior, landing page, and facilitator into one block. Useful, yet it reads like a README dump that could be tightened without losing information.

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?

An output schema exists, so return values need not be explained, and the description fully covers the access model an agent must understand before calling. What remains thin is what the tool itself returns versus what the referenced endpoints return, but the coverage is otherwise sufficient.

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 takes zero parameters, so there is nothing for the description to disambiguate. Baseline 4 applies; no parameter meaning is missing.

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 clearly identifies the resource (AIARENA live/paid commentary) and states it bundles live-match info with purchase instructions. No sibling tool covers commentary, so no explicit differentiation is needed. However, it reads partly as endpoint documentation rather than stating plainly what invoking this tool returns.

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?

It distinguishes the FREE live endpoint (live games and newest replays) from the PAID per-block endpoint and names the condition selecting each. It stops short of explicit when-not-to-use guidance, but the free/paid split is a genuine routing decision.

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