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

Annotations already declare readOnlyHint, idempotentHint and openWorldHint, so the safety profile is covered. The description adds that reading is free and scopes the content to terms/policies, which is mild additional context, but says nothing about authoritative freshness or how it relates to sibling read tools.

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?

A single compact sentence enumerating the covered topics, so it is efficiently sized. The decorative adjective '奇妙生产力' adds no retrievable meaning and slightly buries the core 'service rules' framing.

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?

Return values are covered by the existing output schema and there are no inputs to document, so the remaining burden is disambiguation. The description lists the policy topics but never tells an agent why to pick this over get_service_overview, leaving a meaningful gap.

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?

The tool takes zero parameters, so the schema is trivially complete and the description need not explain inputs. Baseline of 4 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?

The description names a read-only action ('免费阅读') and enumerates the content covered (platform/capability summary, fees, delivery, storage, retrieval, after-sales terms). However it never frames this as a 'service rules/terms' tool in a way that clearly separates it from the sibling get_service_overview, and the marketing phrasing ('奇妙生产力') dilutes the signal.

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?

There is an implied two-step order ('再查看'), but no statement of when to call this versus get_service_overview or the order/payment tools. No prerequisites, no exclusions, no alternatives are named despite a dense sibling set.

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