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

With no annotations, the description carries the full burden of behavioral disclosure. It provides no operation, side effects, return values, or limitations; it is a noun phrase rather than a statement of behavior. An agent cannot infer whether this tool reads, computes, filters, or generates something.

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 short, but the brevity is under-specification rather than efficient structure. It is an incomplete sentence fragment that does not convey an action, and there is no front-loaded usable information.

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?

Even for a zero-parameter tool, the description must state what the tool does and what the agent can expect. With no annotations, no output schema, and no behavioral content, the definition is not complete enough for an agent to select or invoke this tool correctly.

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 tool has zero parameters, and the schema confirms this, so there is no parameter meaning for the description to clarify. Baseline 4 is appropriate for a parameter-less tool.

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 subject—'criteria and any filters of the Routes from a Chinese factory into Amazon US comparison'—but it lacks a verb and does not state what the tool actually does. It is closer to a restatement of the title 'What is compared' than a functional definition, so it does not distinguish compare_criteria from siblings like compare_options or compare_table.

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 guidance is given for when to use this tool versus alternatives such as compare_options, compare_table, or enquiry_describe. The domain is vaguely implied by the description, but there are no explicit conditions, exclusions, or selection criteria.

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