create_inbox

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

No annotations are provided, so the description bears full responsibility for behavioral disclosure. It only states the creation action but does not mention side effects, permissions required, rate limits, or what happens if the address already exists. A mutation tool should disclose potential consequences.

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, front-loaded sentence that efficiently communicates the core purpose. No fluff or redundant information.

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?

Despite having 4 parameters (2 required) and no output schema, the description does not explain return values or confirm what the agent should expect after creation. For a tool that creates a resource, the lack of output details leaves the agent underinformed.

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?

Parameter schema coverage is 100% with clear descriptions for each parameter (address, domainId, sender, displayName). The description adds minimal context ('so the agent can get replies') but doesn't clarify parameter specifics beyond what the schema provides. Baseline score of 3 is appropriate.

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 'Create a receive address' and the purpose 'so the agent can get replies and inbound mail.' It distinguishes from sibling tools like list_inboxes, get_inbox, and delete_inbox by specifying creation.

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?

No guidance on when to use this tool versus alternatives. For example, it doesn't mention prerequisites (e.g., domain must be receiving-enabled) or when not to use it (e.g., when listing existing inboxes). Lacks context for agent decision making.

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