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

Annotations already declare readOnlyHint=true, and 'no payment' adds useful context that the operation has no financial side effect. 'Operator-approved' also clarifies the source of the data. However, the description does not disclose other behavioral traits such as pagination, filtering, or what happens when no capabilities exist.

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 a single, front-loaded sentence with no wasted words. Every clause contributes meaning: 'operator-approved' defines scope, 'interchangeable capabilities' identifies the resource, and 'no payment' signals expected side effects.

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 zero-parameter, read-only listing tool, the description is largely complete: it states the action, the resource, and the payment-related expectation. The only minor gap is that it does not describe what the returned capabilities list looks like, but the absence of an output schema and the simplicity of the operation keep this gap small.

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 tool has zero parameters and the input schema is empty, so the description carries no burden to explain parameter semantics. A baseline of 4 is appropriate since there is nothing for the description to add beyond the structured schema.

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 uses a specific verb ('List') and identifies the resource ('operator-approved interchangeable capabilities'), making the core purpose clear. It does not explicitly name or contrast the sibling tools, but the 'no payment' note helps set expectations that this is an informational listing rather than a financial transaction.

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 no guidance on when to use this tool versus the sibling quote tools. It does not mention alternatives, prerequisites, or conditions under which capabilities listing is or is not appropriate.

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