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

The description uses 'Xem' (view) and 'Đọc' (read), clearly indicating a read-only operation, which aligns with the readOnlyHint annotation. It also mentions checking status 'trước khi trừ tiền', suggesting no side effects on billing. No contradiction with the destructiveHint or openWorldHint annotations is present.

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 somewhat cluttered with mixed-language jargon like 'kho thật' and 'instantReady', and the final clause about reading before deducting money feels slightly out of place. It conveys the main idea without excessive verbosity, but the structure could be cleaner.

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?

Given that there is no output schema, the description provides useful context about the contents (plans and terms) and hints at its role in a purchase flow. However, it does not explain what 'instantReady' means or what the returned data structure looks like, leaving some ambiguity for an agent.

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 describes none, so there is nothing for the description to clarify. The baseline for zero parameters is 4, and the description does not introduce any parameter-related ambiguity.

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 clearly states this is a price list viewer ('Xem bảng giá') and enumerates the specific plans (Mach 1-6) and durations (1/3/6/12 months), giving concrete detail about the resource. It distinguishes itself from sibling tools like list_vps or list_apps by focusing on plans/pricing, though the inclusion of 'kho thật' and 'instantReady' adds some jargon.

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 implies a usage context: 'Đọc instantReady trước khi trừ tiền' suggests checking availability before payment, but it does not explicitly state when to use this tool versus alternatives like list_vps or list_apps. No direct comparison or exclusion criteria are provided, so the guidance is more implicit than explicit.

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