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

Annotations already declare the profile (readOnlyHint=false, idempotentHint=false, openWorldHint=true, destructiveHint=false), which is consistent with a generative non-repeatable call and creates no contradiction. The description adds genuinely new behavioral context not present in structured fields: the output includes a compliance score and follows Circular 39/2018. However it omits any warning that the text is machine-generated/not legally authoritative, what happens with an invalid or mismatched HS code, and nothing about latency or failure modes.

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 content is front-loaded in two short sentences, but the Vietnamese sentence is a verbatim translation of the English one, so half the text is redundant for an agent rather than earning its place. It is not bloated, but it wastes tokens on duplication while omitting parameter detail.

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 non-idempotent, open-world generative tool with 8 undocumented parameters and no output schema, the description is thin. It never explains the shape of the return (beyond 'a description and a compliance score'), the scale/meaning of the score, or how the HS code and product attributes are combined, leaving the agent unable to predict results or validate inputs.

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 0% across 8 parameters, so the description carries the full documentation burden, yet it only alludes to 'an HS code and product details' generically. It does not map to any specific field (maHs, tenHang, xuatXu 2-letter code, chatLieu, congDung, thuongHieu, thongSo) nor explain formats or which fields drive the compliance score. The Vietnamese parameter names are partially self-describing, but that is schema-level, not description value.

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?

Names a specific verb+resource (generates a Vietnam customs declaration product description) and anchors it to a legal standard (Circular 39/2018 / TT 39/2018) plus a compliance score output. It is clearly not the same as siblings like phan_loai_hs or tra_cay_hs, but it never names or contrasts with them, so it stops short of full sibling differentiation.

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: 'from an HS code and product details' hints that an HS code must already be known (possibly obtained via tim_ma_hs or phan_loai_hs) and that the tool is for producing a declaration description. There is no explicit when-to-use, when-not-to-use, or named alternative, so the agent must infer the workflow position.

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