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

With no annotations provided, the description carries the full behavioral disclosure burden. It does disclose a critical trait: 'Paid via x402' informs the agent of a monetary cost. However, it does not mention whether it is read-only, any rate limits, failure modes, or response format. This is a modest disclosure but incomplete for an unbounded API call.

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 a single, front-loaded sentence that packs in the resource, data types, and payment status with zero filler. It is efficiently structured and immediately conveys the essential information without redundancy.

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 parameterless tool with no output schema, the description sufficiently covers what the tool does and the notable requirement (payment). It might be slightly more transparent if it clarified whether the data is real-time or aggregated, but the term 'live market data' hints at that. Overall, it is adequately complete for its simplicity.

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, so the schema fully covers the input space (100% coverage). The description correctly adds no parameter syntax because there is nothing to add. Per the rubric, a baseline of 4 is appropriate for tools with no parameters.

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 resource ('market activity, daily stats, and live market data') and names the data sources. It implies a retrieval operation, but it does not explicitly differentiate from sibling tools like get_onchain_sales, so it misses the explicit sibling distinction. Still, the purpose is unambiguous and specific.

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 guidance on when to use this tool versus the alternatives (get_bot_status, get_onchain_sales). No mention of scenarios, prerequisites, or exclusions. The description only lists what the tool returns, leaving the agent to guess appropriate usage contexts.

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