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

No annotations are provided, and the description only says it 'provides detailed price movements and volume.' It does not disclose important behaviors such as whether the from/to parameters are optional, the default date range, or the exact output format, which is insufficient for a tool with no output schema.

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 two sentences long, with no redundant information. It efficiently states what the tool does and when to use it, making it well-structured and appropriately sized.

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?

Given the tool's simplicity (3 params, no output schema), the description covers the basic purpose and use case. However, it omits information about the optional date range parameters and the specific structure of the returned data (e.g., OHLCV), which would be necessary for full completeness without annotations.

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 coverage is 100% with clear descriptions for symbol, from, and to. The description adds no additional parameter meaning beyond calling it the 'Intraday 1-Hour Price Data API,' so the baseline of 3 is appropriate.

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 'Access 1-hour interval intraday data for stock indexes,' specifying the resource and interval. This distinguishes it from sibling tools like getIndex1MinuteData and getIndex5MinuteData by explicitly mentioning the 1-hour interval.

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?

Provides a clear use case: 'ideal for tracking medium-term market trends during the trading day.' However, it does not mention alternatives or when not to use this tool, so it falls short of a perfect score.

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