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

With no annotations, the description carries the behavioral disclosure burden and does reasonably well. It discloses a conditional 2FA requirement, the need for a Proof account, and the retry flow after start_login opens a session. It does not mention irreversibility or failure modes, but the destructive nature is clear from 'remove'.

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 front-loaded with the core purpose and remains compact. The access/auth paragraph is useful but somewhat verbose with the specific 'Claude Code: /mcp → Authenticate' instruction; each sentence contributes, but it could be tightened.

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?

For a simple one-parameter tool with no output schema, the description covers the essential context: what it does, how to authenticate, and the 2FA caveat. It does not describe what happens on success/failure or how to obtain the email record ID, but list_emails exists as a sibling and the omission is minor.

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 already describes the single parameter as 'Email record ID' (100% coverage). The description's 'by ID' adds no new semantic detail beyond the schema, so the baseline score of 3 applies.

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 states a specific verb and resource: 'Remove an email address from the account by ID.' This clearly differentiates the tool from siblings like start_add_email, list_emails, set_primary_email, and remove_phone.

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 provides clear access context (Proof account required, authentication prerequisite, 2FA possibility) but does not explicitly discuss when to use this tool versus alternatives. Usage is implied by the verb and resource, and there is no competing remove-email tool among siblings, but no exclusions or alternate routing are given.

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