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

With no annotations, the description carries the full burden and does disclose meaningful traits: provider returns only the first page (up to 5 rows), no pagination input, additional pages need separate requests, per-call cost of 0.011 USDC, and an explicit disclaimer that the list does not attest identity or completeness. These are non-obvious operational constraints that go well beyond the name, though the two 'no completeness/safety' statements are near-duplicative rather than additive.

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-loading is weak (the cost and schema-pointer sentences sit mid-paragraph), and 'No completeness or safety guarantee' largely repeats 'does not independently attest entity identity or completeness'. 'One selected Chinese company data tool call' adds nothing. Some sentences earn their place, but several do not.

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 no output schema, no annotations, and a featureless arguments object, the description does cover what an agent minimally needs: prerequisite ID, page-size cap, no pagination, cost, and how to resolve the argument schema. The gaps are mostly in output shape, which is arguably out of scope here.

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 0% on a single opaque 'arguments' object, so the description must compensate; it does so partially by naming the required company_id, its source tool, and pointing to get_cn_data_tool_schema for the real argument contract. It still never documents the actual argument keys or types itself, leaving the agent dependent on an external lookup.

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 names the resource ('Recorded registration changes') but no clear verb or scope beyond that, and it never distinguishes itself from close siblings such as cn_data_v3_register_header or cn_data_v3_termination_overview. An agent can guess it returns change records for a company, but must infer the distinction.

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 supplies a real prerequisite ('Requires the Jinghai company_id from cn_data_v3_company_detail') and a route to argument discovery via get_cn_data_tool_schema, which is genuine usage guidance. However, it never says when to prefer this over the register/termination siblings, so the selection decision is left implied.

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