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

With no annotations, the description must carry the behavioral burden, but it only says 'Prompt discarded.' It fails to disclose that all seven input values are ignored after shape checks (only the schema hints at this), and it leaves the output/state-change behavior unspecified.

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 text is short, but it is under-specified rather than concise; the second sentence is a fragment that creates ambiguity. It could have earned a higher score if the few words were organized around what the tool returns and why the parameters exist.

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?

This is a seven-parameter tool with no annotations, no output schema, and an unexplained name. The description provides almost none of the context needed to call it correctly—neither the return shape, the role of each parameter, nor why 'Prompt discarded' matters. It is completely inadequate for the tool's actual complexity.

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 describes every parameter (100% coverage), so the baseline is 3. The description itself adds no parameter meaning beyond 'discarded', and the odd inclusion of seven unrelated fields is left unexplained.

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 names a concrete action ('Return a three-step thinking template') but does not define what that template contains or what 'Prompt discarded' means (there is no 'prompt' parameter in the schema). It does not clearly differentiate itself from the many sibling validation tools.

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?

No when-to-use context is provided; the description never mentions alternatives, prerequisites, or situations where this tool should be preferred. Given sibling tools like validate-json and geo-hint, an agent gets no routing signal.

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