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

No annotations exist, so the description carries the full burden. It does disclose one genuinely useful behavioral fact: the 5-free-trial-calls-per-wallet quota, which signals cost/rate-limit behavior an agent must consider. However, it leaves key operational traits unstated: whether wallet registration is a prerequisite, how the wallet is identified/authenticated, and what happens once the trial is exhausted.

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 short and front-loads the core purpose ('Scan Polymarket events'), appending the trial-quota note after. It wastes a little space repeating the tool name as a prefix ('x402-polymarket-scan:') when the name is already in the metadata, and the emoji is decorative, but overall it is compact.

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?

Despite being a simple two-optional-param read tool, there are no annotations and no output schema, so the description must carry safety, return-shape, and prerequisite coverage itself. It does not explain what the scan returns, whether a registered wallet is required upfront, or how this differs from the many sibling Polymarket tools — notable gaps given it mentions 'registered wallet' without explaining that linkage.

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 100% (both limit and minVolume have descriptions), so the baseline of 3 applies. The description adds no parameter context, and the schema descriptions are terse ('Limit to process', 'MinVolume to process') with no format guidance — notably both typed as strings, which is unusual for a limit/volume filter and could mislead an agent about the expected value format.

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 uses a specific verb ('Scan') with a specific resource ('Polymarket events'), so an agent can tell this is a read/list operation over Polymarket data. It does not differentiate from siblings like x402-polymarket, x402-poly-markets, or x402-polymarket-odds, which plausibly cover overlapping territory, so it misses the top score.

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 when-to-use guidance or mention of alternatives. With several Polymarket-related siblings (x402-polymarket, x402-poly-markets, x402-polymarket-odds, x402-poly-signals, x402-poly-volume), an agent has no criteria for choosing this tool over them. The '5 free trial calls per registered wallet' note is a quota disclosure, not a routing criterion.

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