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

Annotations already disclose that the tool is not read-only, is open-world, is not idempotent, and is not destructive. The description adds important behavioral context by stating the $0.25 USDC cost on Base and the authority lifetime, retry, and postcondition binding scope. It stops short of describing the response shape or failure behavior, but meaningfully goes beyond 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?

The description is two dense, front-loaded sentences with no wasted text. It leads with the core purpose and pricing, then enumerates the binding scope.

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 is a complex paid verification tool with no output schema and eight parameters, so the description should do more to explain the resulting decision or workflow. It covers purpose, cost, and binding scope, and annotations cover safety hints, but return semantics and operational prerequisites remain unclear.

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 low at 38%, so the description must compensate. It does map several top-level concepts to parameters (subject, action fields, authority lifetime, retries, postcondition), but it omits key details for action_id, nonce, and the allowed-tools/operations/targets lists.

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 specific verification/preflight purpose for consequential agent tool calls and enumerates what it binds: subject, tool, operation, target, parameters, authority lifetime, retries, and postconditions. It is clear what the tool does, though it does not explicitly differentiate itself from the sibling verify_agent_payment_intent.

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 phrase 'for consequential agent tool calls' implies when to use the tool, but there is no explicit when-not guidance or routing to alternatives such as verify_agent_payment_intent or foxify_preflight_info. Usage is inferable but not fully specified.

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