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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so safety is covered. The description adds value beyond that by disclosing pagination ('paged') and the shape of the returned records, which matters since no output schema exists.

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?

Two compact fragments with zero filler, the resource and return fields front-loaded before the endpoint. It is a noun phrase rather than a sentence, but nothing could be cut without losing 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?

With no output schema, the description compensates by naming the three returned fields and confirming paged retrieval. Remaining gaps — sort order, behavior on an unknown price_book_id, whether prices reflect overrides — are minor for a simple read getter.

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% and every parameter carries its own description, including the paging contract ('Pass the previous reply's next_item'). The description adds nothing parameter-specific, so the baseline 3 holds.

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 resource and scope: the product prices belonging to a single price book, with the returned fields enumerated (product id, code, price). This distinguishes it implicitly from kiotviet_list_price_books, but the sibling is never named, so isolation relies on the reader inferring the plural/singular split.

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 never says when to reach for this over kiotviet_list_price_books or kiotviet_get_product, nor that a price_book_id must come from the list endpoint. The only usage signal is the implicit 'one price book' scoping, which leaves the agent to infer the call sequence.

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