stock_quote

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

Annotations already declare readOnlyHint=true, idempotentHint=true, openWorldHint=true, and destructiveHint=false, so the safety profile is covered. The description adds that results are real-time and vendor-backed (Alpha Vantage), which implies external API dependencies and possible rate limits, but it never states them explicitly.

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?

A single front-loaded sentence with no filler, so the purpose is clear at first read. However, its brevity borders on under-specification for a tool with two undocumented parameters.

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?

There is no output schema and no parameter documentation, so the description must carry the burden of explaining what a quote returns and what symbol format is required. It does none of that, leaving the agent to guess both the input format and the response shape.

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 neither 'symbol' nor 'api_key' is documented anywhere; the description does not say that symbol expects a ticker string (e.g. AAPL) or that api_key is an optional/alternative credential. With two undocumented parameters, the description fails to compensate for the coverage gap.

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?

States a specific verb and resource ('Get a real-time stock quote') plus the data vendor (Alpha Vantage), which is more informative than the bare name. It does not distinguish itself from closely related siblings such as stock_intraday, stock_daily, or stock_search, leaving the agent to infer the difference.

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 gives no guidance on when to use this tool rather than stock_intraday, stock_daily, or stock_search, and names no alternatives or exclusions. 'Real-time' is the only hint of the selection condition, and it is implicit.

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