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

Annotations only supply the safety flags (readOnlyHint=false, idempotentHint=false, destructiveHint=false). The description adds real value beyond them: the permission tiers (guests excluded, members read-only, owners/admins/org keys manage), the fact that the private service credential never leaves the server, and that passwords/message content are never returned. It does not explain reversibility or the effect on the suspended state itself, keeping it short of a 5.

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?

Front-loads the action in the first sentence, then uses terse sentences for permissions and security guarantees. No filler, though the short clipped fragments are a bit telegraphic rather than smoothly structured.

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?

With no output schema, the description sensibly covers what is and isn't returned (no passwords, no message content, credential stays server-side) and who may invoke it. Missing only the relationship to the sibling suspend/alias tools and any note on return shape, so it is close to complete for a state-change tool.

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 coverage is 100%, so organization_id, resource_id and idempotency_key are already documented in the schema. The description adds no syntax, format, or inter-parameter meaning, so the baseline 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?

States a specific verb+resource: "Restore suspended mailbox access." That is clear and actionable. It does not, however, distinguish itself from the sibling commsharbor_email_alias_resume, so an agent choosing between resuming a mailbox vs an alias gets no routing help from the text.

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 context through constraints ("No guest access. Members can read. Owners, admins and organization keys can manage email"), which tells the agent when the call will succeed permission-wise. It never states when to use this tool versus the sibling alias resume/suspend tools, so guidance is implied rather than explicit.

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