Send Newsletter Test

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

Annotations declare destructiveHint=true and idempotentHint=true. The description does not mention any side effects or idempotency behavior. It adds the condition of user approval but lacks disclosure about real send actions or potential costs. Annotations partially cover safety, but description misses an opportunity to clarify destructive nature.

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 efficiently state the action and when to use it. No redundancy—every word adds value.

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 description covers the basic purpose and usage condition, but omits behavioral details like side effects (destructive) and error cases. Output schema exists, so return values are not required. However, for a test send tool, more context about its real impact would improve completeness.

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 coverage is 67%, with 'recipient_email' lacking description. The tool description does not explain parameters beyond implying a single recipient. It adds no format or syntax details, leaving the agent dependent on the schema alone.

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 states the action: 'Send a newsletter test email to one recipient.' It specifies the resource (newsletter test) and scope (one recipient), distinguishing it from sibling tools like shipmail_send_message or shipmail_schedule_newsletter.

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?

The description explicitly says 'Use only after the user has approved the exact draft and recipient.' This provides clear when-to-use guidance. Although it doesn't mention alternatives, the context implies test-only usage.

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