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

With no annotations provided, the description carries the full burden, and it does a good job by disclosing the paid nature ('$0.01 USDC per call via x402') and indicating that results are ranked matches with specific fields. It does not explicitly state read-only behavior, rate limits, or failure modes, but for a search tool the main behavioral risk—cost—is clearly flagged.

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 tightly written sentence that front-loads the core action, summarizes the result shape, and appends the essential pricing warning. No words are wasted, and the paid-call notice is critical information rather than filler.

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 search tool with three well-documented parameters and no output schema, the description is adequately complete: it states the search target, the result fields an agent should expect, and the cost. Minor gaps remain around authentication setup, rate limits, and empty-result behavior, but these are secondary for a read-style search operation.

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 input schema already documents all three parameters with 100% coverage, including the query semantics, kind enum, and limit bounds. The description adds no additional parameter-level meaning beyond the schema, so the baseline score of 3 is appropriate.

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 a specific verb and resource: 'Search the largest machine-readable CC0 database.' It also gives a sense of the response shape with 'ranked matches (slug, title, kind, license, contract).' However, it does not explicitly differentiate from sibling tools like cc0pedia or cc0pedia-verify, so the distinction is left to the name and context.

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 when to use the tool (whenever a CC0 database search is needed), but it does not state when not to use it or point to alternatives such as cc0pedia-market, cc0pedia-verify, or cc0-daily-brief. The paid-call notice adds a practical consideration but is not a usage guideline.

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