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

With no annotations, the description must cover behavioral traits itself. It discloses the key self-destruct-on-read behavior and the one-time read URL, but it does not explain the 'days' parameter (likely expiry), access control, or what happens if the URL is not used. This is basic disclosure but lacks depth.

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, concise sentence that directly conveys the core functionality and the return type. Every word adds value; there is no fluff or redundancy.

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 is relatively simple with only two parameters and no output schema, but the description still leaves gaps: the 'days' parameter is undocumented, and there is no usage guidance or mention of prerequisites. It covers the main purpose and return but is not fully self-sufficient.

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?

All parameter descriptions are empty (0% schema coverage), so the description must compensate. It implicitly covers 'value' by saying 'store a value', but the 'days' parameter is completely unexplained. The description fails to clarify the meaning or purpose of the second parameter.

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 tool's function: storing a value that self-destructs on first read and returns a one-time read URL. The verb 'store' and the unique self-destruct/one-time URL behavior clearly distinguish it from sibling tools like create_vault or create_link.

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 does not provide explicit when-to-use or when-not-to-use guidance, nor does it mention alternatives. Usage is only implied by the described behavior; there is no direction on when this tool should be chosen over related tools.

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