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

No annotations are provided, so the description carries the full burden. It discloses a key behavioral trait: the tool offers a free preview but requires a $1 USDC payment via x402 to unlock the full picture. This is important context. However, it does not mention other behavioral aspects such as rate limits, data freshness guarantees, or the exact difference between preview and full output, which are relevant for an agent.

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 concise, with two sentences covering purpose, supported periods, and pricing. It is front-loaded with the core function. However, the phrase 'and the insights you'd miss looking at raw data' is somewhat promotional and adds less factual substance, preventing a perfect score.

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?

Given the tool's simplicity (one parameter, no output schema), the description provides a reasonable picture: what it returns, the configurable time periods, and the payment model. It does not fully explain the structure of the response or the exact mechanics of the preview/full transition, but for a snapshot tool this is moderately complete. The gaps are not large enough to drop below a 4.

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 coverage is 100% for the single parameter 'period', which has an enum and description. The description redundantly repeats the enum values ('1d, 7d, 14d, 30d, or all') without adding extra semantic detail beyond what the schema already provides. The baseline of 3 applies because the schema fully documents the parameter.

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 states the tool provides a real-time snapshot of the agent economy with specific content: top earners, revenue, hottest categories, total volume, and insights. This goes beyond a simple restatement of the name. However, it does not explicitly differentiate from the sibling tool 'market_overview', so it doesn't fully distinguish between alternatives.

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 implies the tool is used for getting a quick, high-level market pulse rather than deep raw-data analysis, but it lacks explicit when-to-use guidance or comparisons with sibling tools. No exclusions or alternatives are mentioned. The usage context is inferred from the 'snapshot' and 'insights you'd miss' phrasing.

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