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

The description goes well beyond the annotations by disclosing that a confirmation email is sent, that updates are gated on confirmation, and that an owner row is written. This adds meaningful behavioral detail about the write and external side effects that annotations alone do not provide.

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 short, front-loaded, and easy to parse. The final sentence restates the confirmation email side effect slightly, but it adds the owner-row write, so the minor redundancy is acceptable.

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?

The description covers the core action, side effects, confirmation behavior, and digest options, which is enough to call the tool correctly. It does not indicate the return shape or a default for the optional digest parameter, and duplicate/error handling is unaddressed, but these are modest gaps.

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?

With only 33% schema description coverage, the description partially compensates: it explains digest as 'immediate or daily' and ties email to a human owner. However, inbox_id is not explicitly described beyond 'this inbox', so the parameter meaning is not fully clarified.

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 concrete action ('Email a confirmation link and code') and explicitly names the state change ('writes an owner row') and side effect ('sends one confirmation email'). This clearly distinguishes it from sibling tools like cooper_notify_owner or cooper_list_owners.

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 implies the use case: register a new human owner who must confirm before receiving updates. However, it does not explicitly say when to use this tool versus alternatives, nor does it name any sibling tool, so the agent must infer routing from context.

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