Tạo giao dịch thử (sandbox, không tốn tiền)

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

With no annotations provided, the description carries the full behavioral burden and does so thoroughly. It discloses auto-creation of a sandbox VA, recording of the transaction, sending a signed webhook, delivering Telegram/email/Zalo notifications, matching checkouts like real money, and not counting toward limits.

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 main Vietnamese sentence is dense but every clause carries useful behavioral information. The English summary is somewhat redundant, but it provides a concise cross-language anchor and helps agents recognize the tool's core purpose quickly.

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 low-complexity tool with all-optional parameters and no output schema, the description covers the trigger, side effects, bank-link behavior, and checkout impact well. The main gap is that it does not describe what the caller receives in response, but that is not critical for safe invocation given the strong behavioral disclosure.

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 67%, and the schema already documents `description` and `virtual_account_number` well, including the auto-VA behavior. The tool description adds little parameter-specific meaning beyond what the schema provides, and `amount` still lacks an explicit semantic description, though its default and bounds are present.

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 the action and resource with 'Tạo một giao dịch tiền vào GIẢ' and 'Create a fake incoming transaction in the sandbox.' It also differentiates itself from real-payment transaction tools by emphasizing sandbox, fake, and no-cost behavior, making it distinct from siblings like monapay_retry_transaction and monapay_list_transactions.

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 the tool is for testing incoming payments: it explains that without a linked bank, MONA Pay auto-provisions an SBX sandbox VA, and that the transaction matches a checkout like real money. However, it does not explicitly state when to use this tool instead of other MONA Pay tools, nor does it give any exclusion criteria.

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