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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint=false, and destructiveHint=false, covering the core safety profile. The description adds the scope of returned data (totals, statuses, inquiries, etc.) but does not disclose behavioral traits like permissions, failure modes, rate limits, or whether historical licences are included.

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 purpose is front-loaded, but the description is a single long sentence with a dense colon-separated list of return fields. Because an output schema exists, enumerating those fields here is largely redundant and reduces conciseness.

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 one-parameter, read-only tool with rich annotations and an output schema, the description gives enough to invoke it correctly: it states the required input, identifies the company scope, and summarizes the returned data. The main gap is the lack of explicit guidance on when to use it versus sibling tools.

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 already includes the same examples of Companies House numbers. The description repeats the example and says 'by Companies House number' but adds no format constraints, validation details, or semantics beyond what the schema provides.

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?

States a specific resource ('All operator licences held by one company or organisation') and keying mechanism ('by Companies House number'). It clearly distinguishes itself from get_licence by returning all licences for a company, but does not explicitly name or contrast with any sibling tool, leaving some differentiation to inference.

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 when-to-use or when-not-to-use guidance. The description never mentions alternatives such as search_operators or get_licence, nor does it state the context in which this tool should be chosen.

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