list_segments

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

No annotations are provided, so the description carries the behavioral disclosure burden. It communicates a read-only listing operation and the reuse/counting benefit, but it does not mention return shape, pagination, permissions, or other edge behavior. This is minimally acceptable for a zero-parameter list tool.

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 description is two sentences with no fluff. The main operation is front-loaded, and the second sentence earns its place by explaining why segment IDs matter for campaign creation.

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 parameterless read-only list, this is reasonably complete: it states what is listed and why the IDs are useful. It does not describe the exact output structure, but the use-case sentence implies the response exposes segment IDs, so the gap 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?

There are zero parameters and the empty schema fully covers them, so there is no parameter ambiguity. The description appropriately focuses on use context rather than parameter details, which matches the baseline for a parameterless tool.

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?

The description clearly states the action ('List') and the resource ('saved audience filters'), so the core function is obvious. It does not explicitly contrast this with the sibling list_audiences tool, though the audience-filter framing helps distinguish segments from audiences.

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 second sentence gives practical usage context: use a segment id when creating a campaign rather than inline filters, so the definition is reusable and counted. It does not name alternatives or exclusions, but the intended scenario is clear.

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