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christianGRogers

yahoo-finance-mcp-server

get_sustainability

Retrieve ESG sustainability scores for a stock symbol, including environmental, social, and governance risk ratings.

Instructions

Get ESG / sustainability scores (environment, social, governance risk).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
symbolYes
Behavior2/5

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

No annotations are provided, so the description must fully convey behavioral traits. It only states that the tool 'gets' scores, but does not disclose whether it is read-only, rate limits, data freshness, or the structure of the returned data. This is insufficient for safe use.

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?

The description is a single sentence with no fluff. Every word contributes to the purpose, making it highly efficient for quick parsing.

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

Completeness3/5

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

For a simple tool with one parameter and no output schema, the description provides the core purpose but lacks details on return format, possible values, or error conditions. It is minimally adequate but leaves gaps for an agent needing to process the output.

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 description coverage is 0%, and the description adds no information about the 'symbol' parameter beyond its existence. Although the parameter name is self-explanatory in context, the description fails to clarify format or constraints, requiring the agent to infer.

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

Purpose4/5

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

The description clearly states the tool retrieves ESG/sustainability scores and explicitly lists the components (environment, social, governance risk). It is specific and distinguishable from sibling tools that focus on other financial data.

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

Usage Guidelines2/5

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

No guidance is provided on when to use this tool versus its siblings. The description does not indicate any prerequisites or criteria for use, leaving the agent without decision support for tool selection.

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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