option_cffex_sz50_list_sina

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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and non-destructive, so the safety profile is covered. The description adds genuine behavioral value beyond that by disclosing that the first returned contract is the main contract, which affects how the caller interprets the result ordering.

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 key scope and the main-contract ordering note are front-loaded, but the trailing ':return: 中金所-上证 50 指数-所有合约' and ':rtype: dict' simply restate the opening sentence and add little. Some redundancy blunts an otherwise tight description.

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 zero-parameter, no-output-schema listing tool, the description is complete: it names the source, exchange, underlying index and the ordering convention of the returned contracts. Nothing an agent needs to invoke it 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?

The tool takes zero parameters, so the baseline of 4 applies. There is nothing for the description to clarify about inputs, and it does not misrepresent the absence of 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+resource: lists all SSE 50 index option contracts from CFFEX via Sina. It also notes the first contract returned is the main contract, which sharpens the resource. However it does not explicitly distinguish itself from sibling variants like option_cffex_sz50_daily_sina or option_cffex_sz50_spot_sina.

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 when-to-use guidance is given. The remark that CFFEX currently offers SSE 50, CSI 300 and CSI 1000 indices hints that sibling variants exist, but the description never tells the agent when to pick this list tool over the daily/spot counterparts.

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