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

Annotations already declare readOnlyHint=false, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds real value beyond them: the name-uniqueness constraint within a parent and the subtle updated_at semantics on the returned row. It still omits failure behavior (e.g., what error a duplicate name produces) and whether folders are auto-named or reordered.

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?

Front-loaded with the purpose, then a constraint, then a labeled REQUIREED/Optional/EXAMPLE block that is easy to scan. The updated_at note is tangential to creating a folder and slightly interrupts the flow, but it earns its place by preventing a misread of the returned row.

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?

There is no output schema, so it is helpful that the description comments on the returned row's updated_at meaning. For a three-parameter creation tool with annotations covering safety, the only real gap is duplicate-name failure behavior and the undocumented connection_context parameter.

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 must carry the load, and it does for two of three parameters: name is marked REQUIRED (str), parent_id is explained as the parent folder UUID with 'omit for top-level' semantics. The connection_context parameter is never mentioned, and the single example only exercises the required field with no parent_id case.

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 a creative folder) plus the tenant scope, so an agent immediately knows what operation runs. It does not explicitly distinguish itself from nearby siblings like creatives_rename_folder or creatives_delete_folder, relying on the verb alone to do that work.

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?

Usage is implied rather than stated: the agent learns the folder is tenant-scoped and that parent_id should be omitted for top-level folders, which is genuine routing guidance for the parameter. There is no explicit when-not-to-use or named alternative, and nothing about what to do when a name collision occurs.

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