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

Annotations already indicate readOnlyHint=true and destructiveHint=false, but the description adds the PRO tier access requirement, which is a critical behavioral constraint not captured in annotations. This additional context goes beyond what annotations provide, enhancing transparency.

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 short sentences, immediately stating the tool's output and access requirement. It is front-loaded with the most critical information and contains no filler or redundancy.

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 low complexity (one parameter, no nested objects) and the presence of an output schema, the description is largely complete. It specifies the data provided, the horizons, and the tier requirement. A minor gap is the lack of detail on what exactly the binary targets represent, but the output schema likely covers return structure.

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%, and the description does not mention the 'ticker' parameter at all. While the parameter name is self-explanatory, the description fails to compensate for the lack of schema documentation, leaving the agent without additional semantics or format details.

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 provides forward-return labels (1d/5d/20d) and binary targets for backtesting. This is a specific, resource-focused purpose that distinguishes it from sibling tools like get_features or get_market_context, which serve different data needs.

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 phrase 'for backtesting' provides clear context on when to use this tool, implying it is for obtaining target labels in backtesting workflows. It does not explicitly exclude alternatives, but the context is sufficiently clear to guide selection.

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