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

Annotations already cover safety (readOnly=false, destructive=false, openWorld=true), so no credit is due for restating that this is a creation. The description adds nothing operational: no mention of duplicate handling if the audience already exists, whether the channel must be connected first, or whether the new audience is auto-attached to any campaign.

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?

A single, front-loaded sentence with no filler. It is efficient but its brevity comes at the cost of specificity rather than through disciplined editing.

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 one-parameter creation tool with a rich nested schema and no output schema, the schema carries most of the weight, but the description omits the source-tool dependency and any post-creation behavior. Adequate to identify the call, thin on how to use it correctly.

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 100% and the nested audience_data object fields (id, name, type, subtype, channel, externalAccountId) are fully documented in-schema. The description contributes only the loose phrase 'native channel audiences' and nothing on required field semantics, so baseline 3 applies.

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?

States a specific verb and resource ('Create a new retargeting audience') and adds a modest qualifier ('from native channel audiences') that hints at the input source. It does not distinguish itself from the many sibling audience-creation tools (create_linkedin_engagement_retargeting_audience, create_audience_from_segment, create_g2_intent_dynamic_audience, etc.), so the agent still has to infer which creator applies.

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 when-to-use or when-not-to-use guidance, and no alternative named among the ~20 sibling create/upload audience tools. The crucial prerequisite — that audience_data should come from get_retargeting_audiences — appears only in the schema, not the description.

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