option_cffex_zz1000_list_sina

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

The description adds a behavioral detail—the first returned contract is the main contract—beyond the readOnlyHint and idempotentHint annotations. It does not disclose potential quirks like pagination or data format nuances, but for a simple read-only list tool, the annotation coverage plus this detail is adequate.

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 description is short and front-loaded, but it repeats the resource phrase twice (once in the main sentence and again in the :return: line). The added note about available indices is useful context but could be trimmed. Overall, it is concise and structured with a clear return type.

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?

The tool is simple (no parameters, no output schema), and the description explains what is returned (all contracts, first contract is main) and the return type (dict). It does not detail the dict structure, but for a list-style endpoint, this is acceptable given the lack of output schema.

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 has zero parameters, so the schema trivially covers all parameters (100%). Per the baseline for 0-param tools, no further parameter explanation is needed, and the description appropriately focuses on output semantics.

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 clearly identifies the resource (CFFEX CSI 1000 index options from Sina Finance) and the action (returns all contracts), and notes the first contract is the main contract. This distinguishes it from sibling tools like option_cffex_hs300_list_sina by explicitly naming the index.

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 implies usage context by stating that only CSI 300 and CSI 1000 index futures/options are currently available on Sina Finance, which hints at when this tool is relevant versus the CSI 300 sibling. However, it does not explicitly name alternatives or state when not to use this tool.

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