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

Annotations already declare destructiveHint=true, idempotentHint=true, and readOnlyHint=false, so the safety profile is covered. The description adds genuine domain consequence beyond that: 'Turns spend ON' tells the agent this action re-enables real ad spend, which is the key operational risk. It still omits permission requirements and error behavior for invalid or already-active IDs.

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?

Two short sentences with the action front-loaded and the consequence appended, which is the right shape. The scope inflation ('ad sets/ads') is a defect rather than wasted words, but it does slightly reduce the value of the first sentence.

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 two-parameter mutation tool with no output schema, the agent still lacks the meaning of meta_account_id, the accepted ID format, and the result of a partial or all-invalid batch. The definition is adequate but leaves real gaps an agent would hit at call time.

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 0%, so the description must carry the burden, and it only covers half: 'by ID' tells the agent campaign_ids are identifiers but gives no format or batch expectations. The second parameter, meta_account_id, is never mentioned at all, and 'ad sets/ads' wrongly implies parameters that do not exist in the schema.

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 ('Resume (activate)') and resource ('paused campaigns/ad sets/ads by ID'), so an agent can immediately tell this is the opposite of pause_campaigns. It loses a point because it claims ad set and ad support that the schema does not actually accept (only campaign_ids).

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 word 'paused' implicitly defines the precondition for use, and 'by ID' implies the agent must already know identifiers. However, it never names the sibling alternative (pause_campaigns) or states what happens if an entity is already active, leaving selection guidance to inference.

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