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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds useful behavioral value by naming the returned data (status, amount received, matched transactions) since no output schema exists, but it omits error/not-found behavior and any pagination or expansion options.

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 short clauses, front-loaded with the action and followed by the returned fields; nothing is padded. Length is doubled by the Vietnamese/English duplication, but that appears to be a house convention rather than filler.

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 single-ID read tool with one fully documented parameter, the definition covers what an agent needs: what it fetches and what comes back. The absence of an output schema is partly offset by enumerating the returned fields, leaving only not-found behavior unspecified.

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?

Only one parameter and schema coverage is 100%, with the schema itself documenting the pr_… pattern. The description adds nothing about the ID beyond what the schema already states, so the baseline 3 applies.

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 opens with a specific verb+resource ("Xem một yêu cầu thanh toán" / "Get a payment request") and enumerates what the response covers (status, received amount, matched transactions). The singular article "một" implicitly distinguishes it from list_payment_requests, though no sibling is named explicitly.

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?

Usage is only implied: fetch one request by ID rather than listing. There is no explicit when-to-use versus list_payment_requests, no prerequisites, and no note on what to do when the record is missing or cancelled (cancel_payment_request is a sibling).

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