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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only restates the purpose and does not mention return format, pagination, rate limits, or what data fields are included in the historical record, which is a significant gap.

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 just two sentences and is easy to scan, but the second sentence largely restates the first ('comprehensive record' vs. 'track historical changes'). It is still appropriately sized and avoids true filler.

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?

With no output schema and no annotations, the description should explain what the analyst grade record contains and how the limit parameter behaves, but it does not. It is complete only for conveying the high-level purpose, not for setting expectations about the response or edge cases.

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?

The input schema already provides descriptions for both parameters (symbol and limit) with 100% coverage. The tool description only adds the phrase 'specific stock symbols,' which does not go beyond what the schema already states, 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 that the tool accesses historical analyst grades and tracks rating changes for specific stock symbols. However, it does not distinguish itself from closely related siblings like getHistoricalRatings, getStockGrades, or getRatingsSnapshot, so it falls short of a 5.

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 implies use for tracking historical analyst rating changes for a symbol, but it does not explicitly say when to use this tool versus alternatives, nor does it mention exclusions or prerequisites. Given the large number of sibling rating/grade tools, more explicit guidance would be helpful.

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