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maxscheijen

MCP Yahoo Finance

by maxscheijen

get_company_overview

Retrieve a normalized company overview for a stock symbol, returning key profile details from Yahoo Finance for analysis.

Instructions

Get a normalized company overview for one stock symbol.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
symbolYesStock symbol in Yahoo Finance format.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Addedv0.2.0

TDQS

C2.9/5.0
Behavior2/5

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

With no annotations, the description carries the full behavioral burden. 'Normalized' hints that values are standardized across sources, which is useful, but nothing is said about data freshness, rate limits, auth requirements, or what 'overview' actually contains.

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

Conciseness4/5

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

One tightly written sentence with the resource and scope front-loaded and no filler. It is appropriately sized for a simple single-parameter read tool, though it is arguably too terse to be maximally useful.

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 one-parameter read tool with full schema coverage, the description is adequate but thin. With no annotations and no output schema, it leaves the return contents ('overview' of what fields?) and safety profile undefined.

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

Parameters3/5

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

Schema coverage is 100% and the single parameter is documented as Yahoo Finance format, so the baseline is 3. The description only reinforces that exactly one symbol is accepted (no batch/multi-symbol use), adding marginal value beyond the schema.

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?

States a specific verb ('Get'), resource ('company overview'), and scope ('for one stock symbol'), so the agent knows this returns a broad profile rather than a single financial statement. It is distinguishable from most siblings by resource, though it does not name which sibling to prefer when a narrower metric is wanted.

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 on when to use this versus the many sibling tools (get_rich_quote, get_income_statement, get_symbol_comparison, etc.). The agent must infer that 'overview' means a summary profile, and there is no stated exclusion or prerequisite.

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