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

Annotations already declare readOnly, idempotent, non-destructive and open-world, so the safety profile is covered. The description adds genuinely new behavioral facts beyond them: the input is a fixed sample sentence, results are cached, and the call returns representative output shape rather than translating the caller's content.

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?

A single sentence with no filler, front-loading the 'free demo' qualifier and ending with the payoff (output shape). Nothing is redundant with the title.

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 zero-parameter, read-only demo with rich annotations and no output schema, the description covers everything needed: what it runs on, that it is cached, and that it returns illustrative output. Only a note on demo limitations (e.g., single fixed sentence, no rate/quality guarantees) is missing.

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 takes zero parameters, which is the baseline-4 case. The description reinforces this by making clear the sentence is fixed, so an agent won't expect to supply text.

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?

States a specific action (demo translation) on a specific resource (a fixed sample sentence) and explicitly names the tool it demonstrates, translate_text. An agent can distinguish it from the real translate_text and from the other *_demo siblings without opening any schema.

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 word 'demo' plus 'free' and the reference to translate_text imply the intended use: previewing behavior before calling the real tool. It does not explicitly say 'use translate_text for actual content' or state any exclusion, so the routing signal is clear but left implicit.

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