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

Discloses that cancellation schedules deletion of ALL databases (destructive), and that a two-step confirmation is required. No annotations exist, so description carries the full burden and does so excellently.

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, front-loaded with the key effect and procedural requirement. No wasted words.

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?

Despite lacking output schema, description mentions the response spells out consequences with concrete dates. For a destructive action, this provides sufficient completeness for an agent to use 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?

Schema already describes both parameters (confirm with const, pro_token optional). Description adds value by clarifying the confirm parameter's usage in the two-step flow and noting pro_token optionality.

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?

Clearly describes the action as canceling the Pro subscription, and elaborates that it schedules deletion of all databases. Distinct from sibling tools which are creation, retrieval, or other operations.

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 explicit step-by-step instructions: call without confirm first, show consequences to user, then retry with confirm='cancel' after approval. Leaves no ambiguity about when to use the tool.

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