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

The description does not explicitly state read-only behavior, but annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false. It adds no operational details beyond the domain fact about segment grouping, so it meets the lower bar set by annotations.

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 short sentences with the action front-loaded. The second sentence provides meaningful context without redundancy or fluff.

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, read-only list operation with comprehensive annotations, full schema coverage, and an output schema, this description is sufficient. It clearly identifies the resource and leaves behavioral details to the structured data.

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?

Both parameters (limit and search) are fully described in the schema with 100% coverage, so the description does not need to elaborate. The description adds no parameter-specific guidance, which is acceptable given the high schema coverage.

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 resource (customer segments), distinguishing it from single-segment tools like get_segment. The second sentence adds useful context about what segments are used for.

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 guidance is provided on when to use this tool versus alternatives such as get_segment, preview_segment_count, or set_segment_members. The description is purely functional and lacks exclusions or alternative recommendations.

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