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 behavior: null means unknown, the output is a summary/header (not the record list), cost is 0.011 USDC per call, pagination needs separate requests, and there is no completeness/safety certification. Authentication or rate-limit details are absent, keeping it short of a 5.

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 purpose sentence is appropriately front-loaded, but the body is dominated by repeated boilerplate disclaimers about certification, completeness, and safety. Several of these clauses ('No completeness or safety guarantee', 'No independent entity identity...') overlap and add length without new information.

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 an opaque single-parameter schema, the description still conveys the key operational facts: return shape (header/summary), null semantics, cost, pagination, and the company_id source. What remains thin is the argument contract, mitigated only by the pointer to get_cn_data_tool_schema.

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% with a single opaque 'arguments' object (additionalProperties: true), so the description must compensate. It partially does by naming company_id and directing the agent to get_cn_data_tool_schema("v3_news_header") for the argument shape, but it does not enumerate or explain the actual parameters.

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 ('查询企业新闻来源统计' – query enterprise news-source statistics) and clarifies this is a summary/header rather than the underlying record list. It distinguishes itself from record-list tools conceptually, though it never names a specific sibling such as the news list/count tools, so the differentiation is only partial.

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?

Gives one concrete prerequisite ('Use company_id from cn_data_v3_company_detail') and a pagination note ('Additional pages require separate requests'), which imply how to call it. However, it offers no explicit when-to-use vs when-not, and no guidance on choosing this over the many sibling count/header tools.

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