option_commodity_contract_table_sina

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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, so safety is covered by structured data. The description adds the return payload ('合约实时行情' as a pandas.DataFrame) and the valid symbol choices, which is useful context beyond the annotations, but does not mention coverage, rate limits, or what 'all contracts' actually spans. Adds some value on top of annotations, hence 3.

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 opening line is front-loaded with the resource being returned, and the Sphinx param/return lines are compact and non-redundant. The raw URL line is mild clutter but not misleading. Nothing is meaningfully wasted.

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 read-only 2-param call with annotations covering safety and no output schema, the description documents both params and the return type, which is mostly sufficient. The gap is that it never resolves how 'symbol' and 'contract' interact or what scope '当前所有' covers, which leaves the agent unsure whether the contract param filters the table or the symbol selects a market.

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?

Schema description coverage is 0%, so the description carries the burden and does so reasonably: it lists the 14 valid 'symbol' choices (豆粕期权, 玉米期权, ... 黄金期权) and gives a concrete 'contract' example ('au2012'). This compensates for the empty schema well. It loses a point for not clarifying that the contract code must belong to the chosen symbol's underlying (e.g. au for 黄金期权).

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 names the resource ('当前所有期权合约' including calls and puts), so the agent can tell roughly what is returned. However it is a noun fragment without a verb phrase, and there is a near-identical sibling 'option_commodity_contract_sina' plus 'option_commodity_hist_sina' with no differentiation at all. The agent cannot distinguish this table tool from those siblings from the text alone.

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?

There is no when-to-use statement, no prerequisites, and no named alternative. The raw Sina URL is the only extra context and does not tell the agent when to pick this tool over option_commodity_contract_sina or option_commodity_hist_sina. Usage must be inferred entirely from the name.

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