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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so safety is covered. The description adds the premium API status and cost ($0.25 USDC via x402), which is useful operational context, but it does not disclose response behavior, rate limits, or data coverage.

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 crisp sentences with no filler. The first sentence states action and input scope; the second adds the ownership-hierarchy outcome and the cost. Every sentence earns its place.

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 low-complexity, single-parameter tool with full schema coverage and safety annotations, the description is largely complete: it states what the tool does, what input it accepts, and that it costs money. It could be stronger by naming sibling tools that cover other company data angles, but nothing essential to calling the tool is missing.

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 description covers the lookup parameter 100% already, so the baseline is 3. The description adds that the input can be a company or subsidiary, which is mildly helpful, but it does not meaningfully expand on what the schema already states.

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 names a specific verb and resource ('Retrieve parent company information') and clarifies the domain with corporate ownership hierarchies and holding company relationships. It does not explicitly differentiate itself from sibling tools like interzoid_business_info or interzoid_company_verification, so it stops 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 gives a clear use context: it applies to a company or subsidiary and answers parent/ownership questions. It does not mention exclusions or explicitly route to alternatives among the many sibling tools, so it is clear but not fully explicit.

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