create_segment

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

Beyond annotations, the description reveals that there are no destructive side effects, explains parameter dependencies for static/dynamic behavior, and describes the return structure. It adds significant behavioral context, though it could mention error handling.

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-structured with a clear purpose statement, guidance, and parameter list. It is suitably concise while providing necessary details, though the Args section is slightly lengthy.

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 tool's complexity (6 parameters, 0% schema coverage) and the presence of an output schema, the description covers purpose, usage, parameters, and return. It could include error handling or idempotency, but overall it is sufficiently complete.

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 provides detailed explanations for most parameters (list_id, name, static, match, conditions_json), including format, source, and conditional requirements. However, the 'account' parameter is omitted, leaving its role unclear.

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 a segment or tag, distinguishes between static and dynamic segments, and contrasts with sibling tools like tag_member. The action is well-defined and unambiguous.

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 description explicitly explains when to use static vs dynamic, mentions prerequisites for list_id, and directs users to alternative tools (add_members_to_segment, tag_member) for related tasks. This provides excellent guidance.

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