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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, covering the safety profile. The description adds only that it computes an implied valuation range, which is modest additional context beyond what the annotations provide, so a 3 is appropriate.

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 first sentence is efficient and front-loaded with the core action and result. The second sentence is an external marketing link that adds little for an agent, but overall the description is short and not padded.

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?

For a read-only calculator with five fully documented parameters and no output schema, the description gives enough context: it names the multiple types, states the input (ARR implicitly via schema), and describes the output as an implied valuation range. It could be slightly more explicit about the output format, but it is largely 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?

Schema description coverage is 100%, and all five parameters (arr, conservativeMultiple, marketMultiple, premiumMultiple, customMultiple) are documented in the schema. The description mentions the multiple types but adds no syntax, format, or constraint details beyond the schema, so the baseline of 3 applies.

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 states a specific verb ('Apply') and resource ('ARR multiples') and explains the outcome ('see the valuation range they imply'). It is clear but does not differentiate from sibling valuation tools such as saas_valuation_multiple_predictor or mrr_to_arr_calculator.

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?

There is no explicit guidance on when to use this tool versus alternatives, no prerequisites, and no exclusions. The purpose implies use for valuation range estimation, but it does not tell an agent when this tool is the right choice over similar siblings.

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