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christianGRogers

yahoo-finance-mcp-server

get_option_expirations

Get a list of available option expiration dates for a stock symbol, enabling retrieval of call and put options data.

Instructions

List the available option expiration dates for a symbol.

Pass one of these dates to get_option_chain to get the calls/puts table.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
symbolYes
Behavior2/5

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

No annotations provided; description does not disclose any behavioral traits such as side effects, rate limits, or response format. Bare minimum.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two concise, front-loaded sentences with no extraneous words. Clearly structured.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the simple single-parameter input and list output, the description effectively conveys the tool's role and relation to another tool. Lacks output format details, but acceptable for a list endpoint.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema has 0% description coverage for the 'symbol' parameter; description adds no extra meaning beyond the parameter name.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Description clearly states verb 'List' and resource 'available option expiration dates for a symbol'. It distinguishes from sibling tools by referencing get_option_chain as a downstream use.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Description explains when to use the tool (to list expiration dates) and indicates a common next step (pass date to get_option_chain). Could be more explicit about when not to use.

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

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