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

With no annotations provided, the description fully carries the transparency burden. It discloses the free tier, no payment required, and that the returned data is wash-filtered using the same v2.0 algorithm as paid endpoints. It also notes pagination and stats/label mix, adding valuable behavioral context beyond the schema.

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 three sentences with all information front-loaded. Every sentence contributes: purpose, return content, use case, and free/wash-filtered behavior. No redundancy or 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?

The tool has 6 parameters and an output schema, but the description covers the core function, use context, cost (free), data quality (wash-filtered), and pagination. The output schema handles return structure details, so the description is sufficiently complete for an agent to decide when and how to call it.

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%, so the baseline is 3. The description adds some alignment by mentioning filters for topic, chain, and seller wallet, which maps to the search, chain, and category parameters, but it doesn't provide new semantic detail beyond what the schema already explains.

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 opens with a specific verb 'Search' and clearly identifies the resource: 'the index of 36k+ x402 services'. It also mentions filters and the types of matching ('by topic, chain, or seller wallet'), which distinguishes it from sibling tools like get_service or get_trends.

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?

Explicitly states when to use: 'Use this to find services by topic, chain, or seller wallet.' It doesn't explicitly name alternatives or exclusions, but the context makes clear this is for discovery/search rather than singular lookups or trends, providing sufficient guidance.

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