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

With no annotations, the description must carry the safety burden, and it does: immediate $2 charge, 30-day period, monthly renewal while credits last, insufficient_credits error, key requirement. It even names the remediation path (buy_credits) for the failure mode.

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 earn their place: action, cost/renewal behavior, and error remediation. The key behavior is front-loaded, and there is no filler or repetition of schema text.

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?

For a simple toggle with no output schema and no annotations, the description covers inputs, cost, renewal, failure mode, and prerequisite action. It does not describe the success response or refund behavior on early disable, but neither is essential for correct invocation.

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 descriptions already cover all three parameters (100% coverage), so the baseline is 3; the description adds value by explaining the financial consequences of the boolean and the relationship between key, name, and ownership.

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 concrete action ('Turn the boomurl banner off/on') and binds it to the enabled parameter and an owned site, making the tool's role immediately obvious. This clearly differentiates it from siblings like publish_site or delete_site.

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?

Provides clear context: use it to toggle banner suppression for a key-owned site, and explicitly orders buy_credits first if an insufficient_credits error might occur. It does not spell out when not to use it, but the purpose is narrow and unambiguous.

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