create_email

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

With no annotations provided, the description must disclose behavioral traits. It mentions 'ephemeral' and the auto-select option, which adds some context. However, it does not state whether login is required, what the tool returns, whether the current address is replaced, or any side effects. This is insufficient for a creation tool.

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 concise: two short sentences with no redundancy. It front-loads the primary action and includes the key optional behavior. Every word earns its place.

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?

This is a creation tool with no output schema, no annotations, and four parameters. The description does not explain what the created address looks like, how to use it, whether prior authentication is needed, or any follow-up actions. It is not complete enough for an agent to invoke it confidently.

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 description coverage is 0%, so the description must compensate for the four parameters. It only addresses the auto-select behavior (matching selectAfterCreate) without naming the parameter, and provides no explanation for aliasName, isBlackbox, or durationMinutes. This is minimal compensation.

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 tool creates a new ephemeral CocoInbox address, which is a specific resource and action. It distinguishes itself from sibling tools like send_email and get_email by clarifying it creates an address, not an email message. However, it does not explicitly contrast with any sibling, so it falls short of a 5.

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?

There is no guidance on when to use this tool versus alternatives. The phrase 'Optionally auto-select it as From' explains a behavior but does not provide usage context, prerequisites, or exclusions. No alternative tools are mentioned.

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