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

Annotations already cover the safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=false). The description adds real behavioral value beyond them: draft-only records and no credit spend, plus the auto-created scene/shot and implicit world creation. It does not mention that repeat calls (idempotentHint=false) produce duplicates.

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?

Two tight sentences with zero filler; the create action is front-loaded and the side-effect caveat follows immediately.

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?

With no output schema, the description should tell the agent what it gets back (e.g. a project id usable with get_creator_flow_project or update_creator_flow_project), and it should cover the remaining parameters. It covers structure and side effects but leaves those gaps.

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 coverage is only 25%, so the description must compensate, but it only re-explains world_id (already described in the schema) and ignores title, summary, and aspect_ratio (including its 16:9 default and enum). Most parameter meaning remains undocumented.

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 blank Creator Flow project) and even specifies the resulting structure: one scene and one shot. It implicitly separates itself from create_generation_request and estimate_generation_cost by stating no generation or credit spend occurs.

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?

It documents the world_id conditional (omit to create a new world), which is usage-relevant, but never says when to use this tool versus create_world or create_generation_request, nor states prerequisites. Usage is implied rather than spelled out.

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