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

There are no annotations, so the description must disclose behavior. It implies a read-only operation ('View') but does not state output details, default scope (e.g., all industries if no filters are provided), or any limitations such as date requirements or data availability.

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 and front-loaded with the action, but the second sentence largely restates the first ('Analyze valuation levels' vs 'View P/E ratios'), making it slightly redundant yet still concise.

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 (3 params, 1 required) and the schema covers parameters, but with no output schema or annotations, the description leaves gaps around default behavior, response format, and usage context. It is adequate for a basic read tool but not fully complete.

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 schema already has full parameter descriptions (100% coverage), so the baseline is 3. The description adds no additional parameter semantics beyond referring to industries and valuation levels.

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's function with a specific verb ('View') and resource ('P/E ratios for different industries'). It distinguishes from sector-level tools by focusing on industries, though it does not explicitly contrast with historical industry P/E or sector P/E siblings.

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?

No usage guidance is provided. The description does not explain when to use this snapshot over alternatives like getHistoricalIndustryPE or getSectorPESnapshot, nor does it mention any exclusions or prerequisites beyond the schema.

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