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

With no annotations provided, the description carries the full burden for behavioral disclosure. It usefully reveals that the tool is free, requires no payment, and returns wash-filtered data using the same algorithm as paid endpoints. It does not discuss error handling or rate limits, but these are less critical for a simple read operation.

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 efficiently structured: a main verb and resource, a colon-enumerated list of returned fields, and a clear usage statement. Each sentence provides distinct value—what it does, when to use it, and key constraints (free, no payment, wash-filtered).

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 single-record retrieval tool, the description is complete: it defines the scope, lists the payload, explains the usage context, and discloses cost/algorithm behavior. Since an output schema exists, detailed return-format documentation is unnecessary, and the one required parameter is fully covered by the schema.

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 schema covers the single parameter 'service_id' with 100% coverage, including a description of what it is. The tool description does not add additional semantic detail about the parameter beyond what the schema already provides, so the baseline score of 3 applies.

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 uses a specific verb ('Get') and clearly identifies the resource ('full detail record for one x402 service'), enumerating the exact fields returned. It distinguishes itself from sibling tools by emphasizing a single service and traffic composition, which is not the focus of search, trends, categories, or check_wash.

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 explicitly states when to use this tool: 'Use this to evaluate a single service's traffic composition.' It provides clear context and intent, though it does not explicitly mention alternatives or exclude other tools, which would warrant a 5.

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