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

Annotations already declare destructiveHint=false and readOnlyHint=false, and the description's "without deleting its configuration" is consistent with that non-destructive profile. It adds real behavioral context the annotations do not: permission requirements (owners/admins/org keys), "No guest access", and that the private service credential stays server-side.

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 critical operation is front-loaded in the first sentence, which is good. But the trailing boilerplate about service credentials and "mailbox passwords and message content are never returned" is generic for a suspend operation and doesn't clearly earn 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?

Covers permissions, non-destructiveness, and credential handling, which is solid for a mutation tool with no output schema. It is silent on operational consequences an agent might need (does the mailbox keep receiving mail, is suspension reversible, what the response signals), leaving clear 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?

Schema description coverage is 100%, with all three required params (organization_id, resource_id, idempotency_key) documented in the schema itself. The description adds no format, example, or meaning beyond that, 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 and resource ("Suspend an alias") and adds a scope constraint ("without deleting its configuration"). It is clearly distinguishable from the sibling resume/create/update tools by the verb, though it never names the resume sibling as its counterpart.

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?

Usage is implied by the verb and the "without deleting" caveat, and the permission sentence ("Owners, admins and organization keys can manage email") hints at who may invoke it. However, there is no explicit when-to-use versus commsharbor_email_alias_resume or update, and no stated prerequisites.

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