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

With no annotations provided, the description carries the full burden of behavioral disclosure. It only vaguely mentions 'price movements and trading volume' but does not disclose response format, date range constraints, pagination, or any limitations. This is a significant gap for a tool with no annotation support.

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 relatively concise at two sentences. The first sentence is direct; the second adds context but includes some filler ('crucial insights') that could be trimmed. Overall, it is appropriately sized and front-loaded.

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 tool is simple with three well-documented parameters and no output schema. The description conveys the purpose and a use case, but lacks explicit usage guidance and response details. It is minimally viable but has room for improvement.

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%, so the schema already documents all parameters (symbol, from, to) with example values. The description adds no parameter-specific meaning beyond the schema, meeting the baseline but not exceeding it.

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 retrieves 5-minute interval intraday price data for stock indexes. It uses a specific verb ('Retrieve') and resource ('stock index 5-minute price data'), distinguishing it from sibling tools like getIndex1MinuteData and getIndex1HourData by interval and asset class.

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 indicates it is ideal for traders requiring short-term data, providing clear context for when to use it. However, it does not explicitly mention alternatives or when-not-to-use cases, so it stops short of full usage guidance.

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