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

Annotations already declare readOnlyHint, idempotentHint and closed-world, so the safety profile is covered. The description adds genuinely non-derivable behavior: the $1.00-per-call charge, the prepaid Agent Credits alternative with the 'Authorization: Bearer <key>' header, and an explicit scope disclaimer. It stops short of any rate-limit or latency detail, but the billing/auth disclosure is substantial value 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?

Three sentences, each doing work: cost/access, what is classified, what is returned plus scope limits. Front-loading the price is defensible for a paid tool an agent may call speculatively. Minor density cost in the long parenthetical enumeration, but no filler.

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 correctly steps in to say the response contains blocking controls and a remediation order. Cost, auth mechanism and scope boundaries are all present for a read-only assessment tool. The remaining gap is the undocumented 'workflow' parameter and the status/evidence value semantics.

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 only 33% and the schema is heavily nested, so the description carries more of the burden. It does enumerate the ten capability keys that populate the required 'capabilities' object, which adds real meaning, but it says nothing about the 'workflow' object (name, intendedUsers, targetEnvironment) or the status/evidence structure. Partial compensation only.

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 and resource: it 'classifies what you declare about ten capabilities of a payment workflow' and names those ten capabilities explicitly. The stated return ('the blocking controls and the order to fix them') makes the output shape concrete, and it is unmistakably distinct from siblings ai_visibility_check and list_paid_services.

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?

It establishes a useful negative boundary — 'It verifies nothing independently and authorizes no payment' — which tells the agent not to expect verification or payment execution. However, it never states when to reach for this tool versus the siblings, nor any prerequisite (e.g., that the workflow must already be declared), so usage is only implied.

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