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

With no annotations and no output schema, the description carries the full behavioral burden. It discloses the cost (1 credit) and the score range (0-100+), which is useful, but says nothing about the return structure, accuracy, read-only nature, side effects, or failure behavior.

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 extremely compact and front-loads the core purpose, score range, input shape, and cost. Every fragment carries information, though the terseness borders on under-specification for an agent unfamiliar with 'proxy-kd'.

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?

Given two parameters, 0% schema description coverage, no annotations, and no output schema, the description is not complete enough. It omits the meaning of the 'keyword' parameter, the response structure beyond a score range, and any limitations or error conditions.

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 description coverage is 0%, so the description must supply parameter meaning. It helps by specifying the input shape for the required 'results' array as [{url,domain?}], indicating url is required per item and domain is optional. However, the optional 'keyword' parameter is completely unexplained in both schema and description.

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 states a specific action and resource: scoring the composition of the SERP top ten as a proxy keyword-difficulty metric on a 0-100+ scale. The verb and subject are identifiable despite the terse Chinese phrasing and the 'proxy-kd' jargon. Sibling tools are unrelated enough that explicit differentiation is unnecessary.

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 alternatives, no prerequisites, and no exclusions. The phrase 'SERP 前十构成打分' implies a keyword-difficulty scoring context, but the agent must infer that entirely.

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