tmall_screenshot

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

With no annotations provided, the description carries the behavioral disclosure burden. It states the core action and the login requirement, but does not mention what happens on failure (e.g., if not logged in) or what the tool returns or saves. For a simple read-only screenshot action, the minimal disclosure is acceptable but not thorough.

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, front-loaded sentence that conveys the action and the key prerequisite without any waste. It is appropriately concise for a simple utility, and every word earns its place.

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 tool with one optional parameter and no output schema, the description covers the core operation and the login requirement. However, it does not mention what happens with the saved file (e.g., return path) or error behavior, leaving minor gaps. Given the tool's simplicity, this is acceptable but not fully complete.

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 has 100% description coverage for the single optional 'path' parameter, which explains its purpose and default. The tool description adds no additional meaning beyond the schema, so it sits at the baseline for high schema coverage.

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 the action (截取/截取截图) and the resource (当前页面截图), specifying exactly what the tool does. It uniquely identifies the screenshot operation among siblings like tmall_navigate and tmall_get_content, making it unambiguous.

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 a clear prerequisite ('需要先登录' – login required) that tells the agent when it is valid to call. While it doesn't explicitly list exclusions or alternatives, the sibling set has no other screenshot tool, so the usage context is clear enough.

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