Cancel Newsletter

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

Annotations already mark destructive and idempotent. Description adds the specific cancellable states and the irrevocability for sent messages, providing useful behavioral context beyond 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, no redundancy, every word earns its place. Extremely concise yet complete.

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?

Given the output schema exists, description doesn't need to detail return values. Covers core action, limitations, and states. No prerequisites mentioned, but not critical for this simple cancellation.

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 has 100% coverage with descriptions for both parameters. The tool description adds no additional meaning, meeting baseline expectations.

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 uses a specific verb ('Cancel') and resource ('newsletter'), clarifies the allowed states (scheduled, paused, sending), and explicitly excludes already sent messages, fully distinguishing it from other newsletter tools.

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?

Clearly states when to cancel (scheduled, paused, sending) and when not to (already sent). Lacks explicit mention of alternatives like 'resume' or 'schedule', but the context is sufficient.

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