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

With no annotations provided, the description carries the full burden of disclosing behavioral traits, but it fails to mention pagination, default limit behavior beyond the schema, output format, authentication, or rate limits. It states the tool allows users to 'view ratings and key financial metric scores' but gives no indication of the response structure or any side effects (though likely read-only).

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, but the first sentence is somewhat marketing-like and repeats the tool's name. The second sentence provides more detail but still contains redundancy (e.g., 'financial ratings' and 'ratings'). It is not overly verbose, but it could be more direct 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?

Given that there is no output schema and no annotations, the description should provide more context about the return structure, how limit affects results, and what 'key financial metric scores' entails. The description is too thin to fully understand the tool's behavior, especially for selecting the correct parameter values or interpreting the response.

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 provides 100% coverage for both parameters (symbol and limit), including a description of limit's default and max values. The description adds minimal semantic value by mentioning 'specific dates' but does not explain how those dates are specified (e.g., via limit). Baseline 3 is appropriate since the schema already documents the parameters clearly.

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 this tool provides access to historical financial ratings for stock symbols, with a specific focus on viewing ratings and metric scores for specific dates. It distinguishes itself from sibling tools like getRatingsSnapshot through the word 'historical,' though it does not explicitly name alternatives.

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 'Track changes in financial performance over time' implies a use case, and the historical nature suggests it is for time-series analysis. However, there is no explicit guidance on when to use this tool instead of related tools like getRatingsSnapshot or getHistoricalStockGrades, nor any mention of exclusions or prerequisites.

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