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

Annotations already declare readOnlyHint, idempotentHint and openWorldHint, so the safety profile is covered. The description adds real behavioral context beyond that: it is free, takes no inputs, hits a fixed example endpoint, and results are cached up to 10 minutes.

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?

Front-loaded with 'Free.' and the payload identity, and every clause carries information (scan scope, output shape, caching, cost). The two sentences are long and parenthetically dense, but little is wasted.

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?

No output schema exists, so the description must cover return values and it does: the signal summary (checks_passed / review_advised / checks_failed), reasons, and per-check methods. What remains unspecified is the concrete result format and whether the cached copy ever refreshes, which is minor for a fixed-example demo.

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?

Zero parameters, so the baseline is 4. The description confirms 'No inputs', which is consistent with the empty schema and prevents an agent from hunting for arguments.

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 returns a full Pay Radar scan (pre-flight payment conditions report) for a fixed example URL. It also explicitly contrasts itself with the paid sibling, noting it is the preview 'before you pay for the paycheck tool on another URL', so an agent can distinguish it without opening a schema.

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?

Gives clear context: use it free to see what the Pay Radar result looks like before paying for paycheck on another URL. It names the alternative tool and the condition selecting it, but does not address the other similarly named sibling payradar_demo, so the routing picture is not fully closed.

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