Cancel Scheduled Email

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

Discloses return value behavior for edge cases. Annotations already provide safety profile; description adds context about canceling a pending email. No contradiction with 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, front-loaded, no wasted words. First sentence states purpose, second sentence clarifies return behavior and edge cases.

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 simple tool with one parameter, output schema, and annotations, the description sufficiently covers purpose, behavior, and edge cases.

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?

Only one parameter 'id' with schema description referencing schedule_email/list_scheduled_emails. Description does not add further semantics beyond what schema provides. Schema coverage 100% so baseline 3.

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?

Clear verb 'cancel' and resource 'scheduled email'. Distinguished from sibling tools like schedule_email and list_scheduled_emails.

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?

Specifies that it works on pending emails and returns false if ID not found or already sent. Does not explicitly list exclusions but provides clear context.

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