create_segment

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

No annotations provided, so the description fully covers behavioral traits: states no destructive side effects, respects read-only/dry-run modes, requires API key authentication, and limits concurrent requests to 10.

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 well-organized: purpose first, then explanation of modes, alternative tool, authentication/limits, and a structured parameter list. Every sentence adds value without redundancy.

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?

Given the 5 parameters, 2 required, and presence of output schema, the description covers all necessary context including parameter details, return value structure, usage scenarios, and constraints. It is fully complete for agent decision-making.

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 fully explains all parameters: list_id with example and source, name, static with default and meaning, match and conditions_json with requirements and dependencies. This far exceeds the minimal schema info.

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 tool creates segments/tags for grouping members, distinguishing between static and dynamic segments. It also differentiates from sibling tools like add_members_to_segment and tag_member.

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?

Provides explicit guidance on when to use tag_member instead, explains static vs dynamic usage, and mentions concurrency limits and authentication. This helps the agent decide when to invoke this tool versus alternatives.

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