Run Newsletter Preflight

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

Annotations already provide readOnlyHint=false, destructiveHint=false, idempotentHint=true. Description adds no further behavioral context beyond stating 'run preflight checks', which aligns with annotations. No contradiction.

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?

Single sentence of 10 words that immediately conveys purpose. No wasted words; optimally concise and front-loaded.

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 that output_schema exists, the description need not cover return values. The brief description suffices for a straightforward preflight check tool with clear timing and no complex behavior.

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?

Input schema fully documents both parameters (id and idempotency_key) with descriptions. The tool description adds no additional meaning beyond the schema, achieving baseline score.

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 states 'Run preflight checks for one newsletter before test sending or scheduling.' Specific verb (run preflight checks) and resource (newsletter), with contextual timing (before test sending/scheduling) that distinguishes from siblings like send_newsletter_test.

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?

Explicitly mentions when to use ('before test sending or scheduling'), implying it's a prerequisite step. Does not list alternatives or exclusions, but the context is clear among siblings.

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