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

Since no annotations are provided, the description fully discloses the tool's behavior: it compares daily snapshots to derive new listings, returns specific fields (service, network, price, seller address), and states the cost of $0.003/call via x402. This is comprehensive and transparent for a read-only query tool.

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 sentence that is front-loaded with the core purpose, followed by the method and cost. It is concise, with no filler or redundant information, and every phrase adds value.

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?

Even without an output schema or annotations, the description provides enough context to understand the tool's behavior, including the exact selection algorithm and output fields. For a simple tool with no parameters, this is a complete and self-explanatory description.

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 provides no additional meaning. The description compensates by explaining what the tool does and what it returns. According to the baseline for zero parameters, this is a high score.

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's function: identifying resources newly listed on the x402 Bazaar. It specifies the exact resource (x402 Bazaar), the verb (just listed), and the scope (everything in the latest daily snapshot missing from the prior one), which distinguishes it from sibling tools like bazaar_delta or bazaar_category_heat.

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 makes the intended use clear by phrasing it as a question ('Which resources just listed...'), indicating it is used to discover new listings. However, it does not explicitly mention when not to use the tool or suggest alternative sibling tools, so it falls short of a perfect score.

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