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

The description adds useful context that this is a non-sending, non-creating readiness check and clarifies the domain of 'campaign.' The annotations already cover readOnly, idempotent, non-destructive, and closed-world behavior, so the description's added behavioral value is moderate but not detailed about what readiness checks are performed.

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 two tightly written sentences with the purpose front-loaded. The second sentence usefully disambiguates 'campaign' as an outbound email campaign rather than a web page, and there is no wasted text.

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?

Although an output schema and annotations exist, the tool has 11 parameters and no schema descriptions. The description gives no guidance on how to populate those parameters or what inputs are needed for a meaningful preflight, leaving a major invocation gap.

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?

There are 11 parameters with 0% schema description coverage, and the description does not explain any of them. It does not clarify senderId, audienceId, campaignId, reviewMode, idempotencyKey, expectedSendCount, or the external* fields.

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: checks whether a proposed outbound email campaign is operationally ready. It also distinguishes preflight from create/send actions by saying it does so 'without creating or sending it,' though it does not explicitly name sibling tools like get_campaign_status.

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 wording 'proposed' and 'without creating or sending it' implies this should be used before creating or launching a campaign. However, it does not explicitly state when to use this versus alternatives such as get_campaign_status or create_campaign.

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