option_cffex_zz1000_list_sina

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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description adds one genuinely useful behavioral fact — that the first returned contract is the main contract — but discloses nothing about return structure, ordering beyond that, or rate/coverage limits.

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 and short, but the ':return:' line restates the same CSI 1000 contract information already given in the opening sentence, adding redundancy rather than new content. Rtype 'dict' contributes little.

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?

No output schema exists, so the description should ideally describe the shape of each contract in the returned dict; instead it only says 'rtype: dict'. It covers source, scope and main-contract convention, but leaves the return structure underspecified for a list tool.

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 there are no argument semantics to explain. Baseline of 4 applies for a no-argument tool; nothing in the description contradicts or confuses the empty schema.

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: listing all CSI 1000 index option contracts from Sina/CFFEX. It even enumerates the index universe Sina covers (HS300 and ZZ1000), which helps distinguish the resource scope. However it does not differentiate itself from close siblings like option_cffex_zz1000_daily_sina or option_cffex_zz1000_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?

Gives implied usage by describing what the endpoint returns and that the first contract is the main contract, but never states when to choose this over the daily/spot sibling tools. The 'when' is left to inference.

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