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

Annotations already declare read-only, idempotent, and non-destructive behavior. The description adds valuable behavioral context: it is free, accepts no credentials, raw prompts, arbitrary request bodies, or secrets, and returns no substantive authorization verdict. This goes beyond the annotations. However, it does not disclose what the tool does return (e.g., a validation status or error details), leaving some ambiguity.

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 concise with two sentences and front-loads the core purpose. There is no filler or redundancy. However, the brevity contributes to the lack of detail in other dimensions, so it is efficient but at the expense of completeness.

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?

This tool has complex inputs with nested objects, three parameters, zero schema descriptions, and no output schema. The description is far too sparse to cover these gaps. It omits return behavior, parameter semantics, and usage context, making it inadequate for an agent to correctly construct or interpret the call.

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 has 0% description coverage, so the description must compensate by explaining the parameters. It only hints at 'authority envelope' (likely mapping to the 'authority' parameter) but provides no explanation of 'action' or 'context'. No parameter names, data types, or construction guidance are given, leaving agents without the information needed to invoke the tool correctly.

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 clearly states a specific verb ('validate') and resource ('structured authority envelope'). It also clarifies that it returns no substantive authorization verdict, which distinguishes it from an authoritative check. However, it does not explicitly name sibling tools like check_action or verify_receipt, so it does not achieve full differentiation.

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 mentions it is free and returns no substantive verdict, implying it serves as a lightweight preflight check, but it never explicitly states when to use this tool versus alternatives. No alternative tools are named, and there is no guidance on conditions that would make this tool inappropriate.

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