yfinance_get_option_chain

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

Annotations already declare readOnlyHint, destructiveHint, idempotentHint, and openWorldHint. The description adds value by detailing the JSON fields returned (e.g., contractSymbol, strike, impliedVolatility) and the intended use case for options analysis, without contradicting annotations.

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 front-loaded with the purpose and then lists the JSON fields. It is moderately concise; the field list is helpful but could be slightly more condensed. However, it remains clear and well-structured.

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 description is sufficiently complete for a data-fetching tool: it explains what data is returned, how to use parameters, and references a sibling tool for dates. The presence of an output schema (though not provided) is compensated by the detailed field listing.

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 100% for all three parameters. The description adds semantic value by explaining the expiration_date parameter's relationship with yfinance_get_option_dates and by listing the fields in the output, which aids understanding beyond the 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?

The description clearly states the tool fetches option chain data (calls and puts) for a stock, with specific mention of strike prices and expiration dates. It distinguishes itself from sibling tools like yfinance_get_option_dates by explicitly referencing it for finding available dates.

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?

The description provides implicit usage guidance by referencing yfinance_get_option_dates to obtain expiration dates, but it does not explicitly state when to use this tool over others or when not to use it.

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