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

With no annotations, the description carries the full behavioral burden and discloses almost nothing. It does not say whether the change is idempotent, what permissions are required, what happens when the ad group is already in the target state, or how notification_message behaves when the follow-up reply fails.

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 front-loaded sentence with no filler. It is efficient, though the brevity tips into under-specification for a mutation tool rather than excess.

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?

A four-parameter mutation tool with no annotations and no output schema needs more than one sentence. The description says nothing about side effects, permission requirements, or the notification_message fallback parameter, leaving the agent to guess at behavior.

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 required IDs and the status field are already documented, including the default of ENABLED. The description restates the status values the schema already lists and adds no syntax or format detail, 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: set ad group status to ENABLED or PAUSED. It is clear what the tool does, but it does not differentiate itself from sibling update_ad_group, and the name enable_ad_group suggests a narrower action than the PAUSED option the description offers.

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 and no mention of the obvious alternative update_ad_group, which could also change status. The agent must infer that this is the dedicated status-toggle path rather than the general update path.

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