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

Annotations already declare it non-read-only, idempotent and non-destructive, so the bar is lower. The description still adds real behavioral context: volume remains reduced while the rate is high, and a single further bounce re-pauses the site - consequences an agent cannot infer from annotations or schema. It omits return/confirmation behavior, hence not a 5.

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?

Four short sentences, zero waste, with the identifying condition and the sibling disambiguation front-loaded. The trailing reminder to explain the pause to the user is actionable rather than filler.

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 simple one-parameter, single-purpose mutation with no output schema, the description covers purpose, precondition, alternative, side effects and a follow-up obligation. Only a note on what a successful call yields is absent, which is minor.

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?

Only one parameter, and schema description coverage is 100% - the schema itself explains workspaceId and how to enumerate sites via get_status. The description adds no parameter-level 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+resource and the exact precondition ('a site that paused ITSELF over its bounce or complaint rate'), which is far more precise than the name alone. It explicitly contrasts itself with the sibling set_sending, so an agent can route between them without opening schemas.

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?

Explicitly says when to use it (automatic pause confirmed via get_sending_health) and when not to (this is not the on/off switch; set_sending is), naming the alternative. It also imposes a workflow prerequisite: tell the person the reason for the pause before calling.

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