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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so the safety profile is covered. The description adds the useful scope of what is verified, but says nothing about what a failed/expired mandate does or what the caller receives, leaving behavioral disclosure thin 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?

A single sentence with no filler, and the core purpose is front-loaded before the enumerated checks. The comma-chained triple check is dense but each clause carries information, so size is appropriate for the tool's complexity.

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?

With no output schema, the description should ideally hint at the return (pass/fail, expiry, limit breach reason) so an agent knows how to consume the result; instead it only describes what is inspected. It is adequate but leaves a real gap for a verification tool whose value is in its verdict.

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%, so agentId, chainId (default 8453) and transactionAmountUsd are already documented in the schema. The description only loosely echoes transactionAmountUsd via 'within corporate limits' and adds no format, unit, or chain-selection nuance beyond what the schema provides; baseline 3 applies.

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 verb (Verify) and a precisely named resource (agent's Know Your Agent corporate liability mandate), then enumerates the three things checked: mandate existence, active validity, and transaction-amount limits. It is clearly distinguishable from check_reputation and escrow_x402_call by resource, though it never names those siblings explicitly.

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?

Usage is only implied: the phrase 'proposed transaction amount' suggests this is a pre-transaction gate, but the description never states when to call it versus the reputation or escrow siblings, nor any prerequisite (e.g., must the agent ID be registered first). No exclusions or alternatives are given.

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