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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds no behavioral context beyond the status filter—no mention of default behavior, pagination, empty results, or what happens if status is unspecified. It earns only minimal credit for not contradicting the annotations.

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?

A single short sentence with no filler, and the key filtering dimension is front-loaded. It is concise but verges on under-specification because it omits operational details; still, for pure conciseness and structure it is well-formed.

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?

Although an output schema is present and annotations cover read-only/idempotent behavior, the description fails to explain the crucial status dimension: what values are valid, whether the parameter is required, or how to specify it. Since the schema has no parameters, the description is the only place this could be clarified, and it leaves a critical gap.

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?

With zero parameters in the schema, the description's 'by status' is the only hint that a filter should exist, but it provides no way to supply it, no allowed values, and no syntax. The description introduces semantic meaning the schema does not support, leaving an agent unable to actually invoke the intended filter.

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 clear verb-resource pair ('Finds Pets') and a specific filter ('by status'), which distinguishes this from siblings like findPetsByTags and getPetById. However, it mostly restates the tool name and provides no detail on what statuses exist, so it stops short of a fully informative 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?

Usage is only implied by the tool name and the phrase 'by status': an agent can infer this is the tool to use when filtering pets by lifecycle status. There is no explicit guidance about when to prefer this over findPetsByTags or other sibling tools, nor any mention of exclusions.

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