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

Annotations are absent, so the description carries the full burden. It discloses the output (live delivery status, basic stats) and 'recent' ordering scope, but fails to state that this is a read-only operation, what 'recent' means, or any authentication or side-effect details.

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?

A single sentence with clear front-loading of the action and resource, and a compact description of included stats. No superfluous words; the only mild lapse is the omission of usage guidance, which costs a point.

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 small list tool with no output schema and no annotation, the description covers the core return content but not pagination/sorting details or the behavior of omitted agentId/accountId. The schema fills the latter gap, leaving residual ambiguity about the 'recent' boundary and statistics.

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?

Input schema coverage is 100%, so the schema already thoroughly documents limit, agentId, and accountId. The description does not add parameter-specific meaning, which is acceptable per baseline when schema coverage is high.

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 names the action and resource precisely: 'list recent messaging campaigns' with the specific return content 'live delivery status and basic stats.' It is immediately distinguishable from siblings like get_campaign_status (single campaign) and get_campaign_performance (performance analytics).

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 gives no explicit when-to-use instructions or alternatives to route to, such as get_campaign_status for a single campaign. The 'list' verb implies usage for getting multiple campaigns, but no exclusions or conditions are stated.

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