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

Annotations already declare readOnly/idempotent/non-destructive/openWorld, so the description's job is to add nuance, and it does: it is free of charge and performs no order creation. It does not mention call volume, rate limits, or whether 'full' is a strict superset of 'compact', which is the remaining ambiguity.

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-loaded with the purpose, then the mode recommendation, then the scope exclusion in a single dense but well-ordered passage. Every clause adds information; the only cost is that the mode guidance and the 'what full mode contains' clause are packed together in one long sentence.

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?

An output schema exists, so return format need not be described. Given a single optional enum parameter and full annotation coverage, the description supplies everything an agent needs: what it is, which mode to pick, where to go next, and the fact that it has no write side effects.

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?

With 0% schema description coverage, the description carries the weight and succeeds: it names both enum values, explains what 'compact' returns (grouping + delivery summary) versus 'full' (inputs, live pricing, examples, connection methods), and states the default. It stops short of clarifying whether full mode also includes the compact summary.

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 states the resource clearly ('了解奇妙生产力当前的文件制作与实用工具') and frames the tool as a free overview whose output is a grouping and delivery summary, so an agent can tell it apart from get_tool and search_tools. It never says the explicit noun 'catalog/list of services', which keeps it one step short of 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?

It gives an explicit recommended path — use mode=compact first, then go deeper with search_tools/get_tool — plus the default (full mode) if detailed inputs, pricing and examples are needed. It also states the boundary '不创建订单', ruling out the order-creating siblings (create_order, prepare_task) unambiguously.

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