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

Beyond the read-only/idempotent annotations, the description discloses the payload contents (标题/发文单位/日期/亮点/信源) and the default all-cities behavior. This adds meaningful behavioral context that the annotations do not provide, though ordering and pagination are not addressed.

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 description is compact and well-structured: a one-line resource definition, a short when-to-use section, and the optionality behavior. Every sentence earns its place, and the key filter behavior appears early.

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 simple read-only list tool with one optional parameter and no output schema, the description is complete: it names the return fields, the filtering behavior, and typical usage contexts. No critical information for invoking the tool correctly is missing.

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 100%: the city parameter already documents '城市过滤，不传返回全部'. The description repeats this behavior and adds example queries but no substantive parameter semantics beyond what the schema provides, so it stays at the baseline 3.

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 identifies the resource as city/district entrepreneurial policy benefits and lists the returned fields (标题/发文单位/日期/亮点/信源). It is unambiguous about what the tool returns, though the verb '列出' is only implied by the title and it does not explicitly differentiate itself from sibling list tools, so it does not earn a 5.

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 【何时用】 section provides concrete example queries ('深圳 OPC 有什么政策红利', '入驻前看看当地政策') that clearly signal when an agent should call this tool. It does not mention when not to use it or name alternative tools, so it falls short of the highest bar.

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