captcha_solve

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

No annotations are provided, so the description carries full burden. It mentions cost and free tier limits but does not disclose behavioral traits such as whether the tool returns the solved text, what types of CAPTCHAs it handles, error handling, or rate limits. The minimal description fails to provide necessary behavioral context.

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 very short (one line), which is concise but at the expense of completeness. It lacks essential information about usage and behavior. While it is not verbose, it does not earn its place as it omits critical details.

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 the tool's simplicity (one parameter, no output schema), the description should still explain what the tool returns (e.g., the solved CAPTCHA text). It does not address return values or error conditions. The free tier note is helpful but insufficient for completeness.

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% with one parameter 'imageUrl' described as '验证码图片URL'. The description adds no further semantic details about the parameter, but the schema itself is clear. The baseline of 3 is appropriate as the description does not degrade or enhance the schema's information.

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 '验证码识别' (CAPTCHA recognition), which clearly identifies the tool's purpose as solving CAPTCHAs. It is a specific verb+resource combination that distinguishes it from sibling tools like 'image_analyze' or 'web_crawl'.

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 provides no guidance on when to use this tool versus alternatives. It only mentions pricing and an API URL, without specifying contexts or exclusions. Sibling tools like image_analyze could potentially also handle some captcha tasks, but no differentiation is given.

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