Tạo giao dịch thử (sandbox, không tốn tiền)

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

With annotations only covering the generic safety profile (write, non-idempotent, open-world), the description discloses the real side effects: auto-provisioning a sandbox VA, recording the transaction, firing a signed webhook, sending Telegram/email/Zalo notifications, and matching checkout sessions as paid. It also states the quota behaviour ('không tính hạn mức'), which no annotation conveys.

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?

Front-loaded with the sandbox nature, then the behaviour chain, then a compact English gloss. Dense but nearly every clause carries information; only the 'GIẢ/fake sandbox' idea is mildly repeated across both languages.

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 mutation tool with no output schema, the description covers preconditions, side effects and quota behaviour well. It stops short of describing what is returned (e.g. transaction id or VA number), which would help an agent chain a follow-up call.

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 coverage is 67% and the schema already explains the 'description' order_code trick and the blank virtual_account_number auto-VA behaviour. The description largely restates those semantics ('bỏ trống = tự cấp VA sandbox SBX') without adding format or constraint detail, 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?

States a specific verb and resource (tạo giao dịch tiền vào) plus the critical scope qualifier (GIẢ / sandbox), and immediately clarifies it is the fake-money path that behaves like the real one. This lets an agent separate it from real transaction/checkout siblings without opening a schema.

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?

It gives a usable precondition ('chưa nối ngân hàng thì MONA Pay tự cấp VA sandbox SBX') and implies the testing context, but never explicitly says when to pick this over monapay_create_checkout or monapay_list_transactions, and names no alternative. Usage is inferable rather than stated.

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