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

No annotations provided, so the description carries full burden. It does not disclose whether this is a read-only operation, data source, update frequency, rate limits, or error behavior. The mention of free trial calls is a minor cost hint but not substantive behavioral context.

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 English description is relatively concise, but the inclusion of Chinese text and emoji/marketing ('🆓 5 free trial calls per signed wallet') adds noise. The structure is front-loaded with the core function, which is good, but the bilingual repetition and promotional elements reduce efficiency.

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?

With no output schema and no annotations, the description should fully explain the tool's behavior, required inputs, and return format. It lists some output fields but does not clarify input format, error handling, or data sources. For a financial data tool, this is insufficient.

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 input schema is empty (0 parameters) and the description says 'Pass a code' without defining the parameter. This is a critical omission: an agent cannot know what format the code should be (e.g., ticker symbol, numeric ID) or whether other parameters are accepted. Schema coverage is 100% but for zero params, so baseline is 4, but the description fails to specify the required input despite mentioning it.

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 a specific purpose: returning PE/PB historical percentile, percentile value, historical range, and peer comparison for an A-share given a code. However, the name 'a-pe-pb-----mrj23i7f' is opaque and the purpose is mixed with marketing copy. The core function is clear enough but not sharply differentiated from siblings like x402-pe-ratio or price-to-book.

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?

No explicit guidance on when to use this tool versus alternatives. It implicitly requires passing an A-share code but does not specify the format or conditions. The '5 free trial calls per signed wallet' hints at cost but not usage context.

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