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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered structurally. The description adds only that a message, audience and schedule come back with the campaign; it says nothing about permissions, missing-ID errors, or whether the schedule is resolved timezone-aware data.

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 efficient sentence with the verb and resource front-loaded and zero filler. It is arguably too short rather than bloated, so it does not reach a 5 for structure value.

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?

There is no output schema, so the description carries some of the return-value burden, and it only gestures at three of the eleven fields available in the 'fields' enum. For a simple one-required-param getter this is adequate but leaves the return shape under-specified relative to the enum breadth.

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%, so both parameters (campaign_id and the fields projection array) are already documented in the schema, which sets the baseline at 3. The description adds no format, syntax, or default information beyond what the schema provides.

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?

Clear specific verb+resource: 'Get one campaign', and it names the returned payload components (message, audience, schedule). However, it does not distinguish itself from sibling getters like get_whatsapp_campaign or get_voice_campaign, so an agent cannot tell from the description alone which campaign type this covers.

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?

No when-to-use guidance, no exclusions, and no alternatives named. The only routing hint ('as returned by list_campaigns') lives in the schema parameter description, not the tool description, so the description itself contributes nothing about tool selection.

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