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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only states that this is a creation operation and adds no context about response format, duplicate handling, whether `filter` is required for saved_segments, side effects, or validation behavior. The description effectively restates what the tool name already implies, offering no behavioral depth beyond it.

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 six words, front-loaded, and entirely free of redundancy. Every word earns its place, which is good for conciseness, though the extreme brevity borders on under-specification rather than disciplined economy.

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 creation tool with a nested filter object, no output schema, and no annotations, this definition is incomplete. An agent cannot learn how to structure `filter`, whether `kind` changes required inputs, or what the response contains. The definition provides no bridge to likely follow-up tools like audience_get or audience_members.

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?

Schema description coverage is 75% with descriptions for organization_id, name, and kind; the description reinforces the kind values via 'audience or saved segment' but adds little beyond the schema. The `filter` nested object is undocumented in both the schema and the description, leaving an agent unsure how to structure it. Given the 75% coverage, baseline 3 is appropriate.

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 states a specific verb and resource: 'Create an audience or saved segment.' The two kinds map directly to the `kind` parameter, and the create verb clearly distinguishes it from siblings like audience_delete, audience_get, and audience_update. However, it does not explicitly name alternatives or differentiate itself from close operations like audience_member_add.

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 given about when to use this tool versus alternatives. With over 100 siblings including audience_update, audience_delete, and audience_member_add, an agent receives no decision criteria for choosing this tool. There is no mention of prerequisites, context, or exclusions.

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