update_email_zone

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

With no annotations, the description carries the full burden of behavioral disclosure, but it only restates the tool's name (a tautology). It fails to mention side effects, how partial updates work, permission requirements, or error handling for a mutation tool, which is a significant gap.

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?

The description is a single, efficient sentence with no filler language. While it lacks richness, it is appropriately concise and front-loaded, containing the core action and resource.

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 tool's complexity (9 parameters, nested objects, no output schema), the one-sentence description is severely inadequate. It does not explain return values, update semantics (merge vs. replace), or any constraints, leaving the agent without essential operational context.

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?

The input schema provides complete descriptions for all 9 parameters, including types, enums, and nested object structures. The description itself adds no parameter-level information, but the schema's 100% coverage ensures parameters are sufficiently self-explanatory.

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 identifies the action ('Update') and the resource ('existing email zone'), distinguishing it from create/delete email zone tools. It also differentiates from the generic 'update_zone' by specifying 'email', though it doesn't explicitly state that this is for email zones only.

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 gives no guidance on when to use this tool versus alternatives like update_zone or vast_update_zone. It doesn't state any prerequisites, exclusions, or scenarios where this tool is preferred, leaving the agent without clear selection criteria.

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