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

No annotations are provided, so the description carries the burden. It discloses read-only behavior, no api_key required, in-stock filtering, public-fields-only output, and price in VND. It does not mention pagination or what happens when no products match, but the core behavioral traits are clearly stated.

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 compact and front-loaded with the core behavior, followed by routing guidance and optional scoping. The bilingual Vietnamese repetition adds some redundancy, but it is not excessive and may serve multilingual users.

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 read-only list tool with no output schema and no annotations, the description covers the essential context: what is returned, ordering, filtering, and authentication. It lacks explicit pagination details and a note about empty results, but the tool is simple enough that these are minor gaps.

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?

Schema description coverage is 100%, so the schema already documents all three parameters. The description adds context by mentioning category_id comes from list_categories and that keyword filters by product name, but this is marginal value beyond the schema.

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 states a specific verb ('List'), a resource ('newest in-stock public products'), and a clear ordering ('recently added first'). It also distinguishes itself from siblings by naming the exact use case ('new arrivals / just added') and explicitly listing which sibling to prefer for other intents.

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 explicit WHEN TO USE and PREFER INSTEAD guidance, naming four sibling tools and the conditions that select them. It also notes optional scoping via category_id or keyword, giving an agent clear decision rules.

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