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

Annotations only cover readOnlyHint and openWorldHint; the description adds genuinely new behavioral facts an agent cannot get elsewhere: a $0.002 USDC charge over x402 and no charge on failure. It does not disclose what the scan detects or what it returns, which limits it below a 5.

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?

Very short and front-loaded: capability first, cost second. The run-on between the purpose clause and the pricing sentence and the redundant 'Privacy Guard:' prefix are minor blemishes on an otherwise tight description.

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?

There is no output schema, so the description carries the burden of explaining return values, yet it never says what a scan yields (a findings list? which entity types?) or how the optional redacted_text behaves. Pricing is covered, but the core output contract an agent needs before paying is missing.

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 all three parameters (text, names, redact) are already documented in the schema with constraints like maxLength, maxItems, and default. The description adds no parameter-level detail, so the 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 and resource: scan text, optionally redact it. That is enough to distinguish it from all listed siblings (chess, email, lockbox, marketplace, etc.). It stops short of naming what the scan looks for (PII, operator/client names), which the schema supplies instead.

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?

No when-to-use or when-not-to-use guidance, and no alternatives are named. The only decision-relevant context is the price, which helps an agent judge cost but says nothing about which situations call for this tool.

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