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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, so the safety profile is covered. The description adds value beyond annotations by disclosing access requirements ('Free to call, no wallet required') and scoping the content to payments, referrals, badges, and testimonials. No contradiction with 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?

Two sentences with no filler. The core value proposition is front-loaded ('Full algorithmic transparency: how we verify...'), immediately followed by the concrete scope and the access condition. Every word earns its place.

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?

The tool has no parameters, an output schema is present, annotations cover safety and idempotency, and the description names the specific content domains covered. An agent has everything needed to select and invoke this informational tool correctly.

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?

There are zero parameters, so parameter semantics are effectively moot. The input schema is empty and description coverage is 100%. Baseline for a no-parameter tool is high, and the description appropriately focuses on what the information payload contains rather than parameters.

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 clearly identifies the tool as an informational resource: 'Full algorithmic transparency: how we verify payments, referrals, badges, testimonials.' It names specific covered topics and is not a tautology. It could go further by explicitly contrasting itself with transactional sibling tools, but the purpose is clear enough.

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?

'Free to call, no wallet required' gives good access context and implies there are no prerequisites. However, it does not explicitly state when to choose this tool over alternatives like plaza.check_badge, plaza.claim_badge, or plaza.testimonial, nor does it list exclusions. Usage context is clear but not exhaustive.

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