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

Beyond the destructiveHint/openWorldHint annotations, it discloses the real-world consequence (calls real people), the cost model (billed by the provider), and the hard prerequisite (panel-level consent that cannot be granted through this tool). Those are exactly the behavioral traits an agent needs before invoking an outbound-calling mutation.

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?

The action and its billing/scope tag are front-loaded ('[publish · spend] STARTS (or resumes)...'), and the remaining sentences carry necessary prerequisites. It is somewhat dense with parentheticals but each clause adds real information.

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 no-output-schema mutation tool, the description covers effect, cost, and gating prerequisites well. It leaves minor gaps: how the identifier parameters combine and what state the campaign returns in, but nothing that would cause an agent to misuse it.

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?

With 0% schema description coverage, the description does name both identifiers and implies an either/or choice via '(`voip_campaign_id` or `voip_campaign_uuid`)'. However, it does not state whether exactly one is required, what happens if both or neither are supplied, or whether the two refer to the same entity—so it only partially compensates for the schema gap.

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 (starts/resumes) and resource (a VOIP campaign) and describes the concrete effect: the voice assistant begins calling real people within the campaign's calling window. This clearly separates it from create_voip_campaign, pause_voip_campaign, and place_voip_call without needing the schema.

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?

Gives a strong precondition—the merchant must have confirmed consent in the panel, and that confirmation cannot be given here—plus the practical requirement that the campaign has people to call. It stops short of explicitly naming alternatives (e.g., pause_voip_campaign or import_voip_campaign_targets), so it is clear context without full routing.

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