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

No annotations are provided, so the description carries the full burden. It explicitly states 'No authentication required' and uses 'Get' to imply a read-only operation. It lists the content returned, providing useful context. However, it does not describe response format or error behavior, which is a minor gap for a no-parameter metadata tool.

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 two short sentences: one front-loaded with the action and object, and a second for the auth requirement. Every word is purposeful, with no redundancy or filler.

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 low complexity (no parameters, no output schema, no annotations), the description adequately conveys the purpose and auth requirement. However, 'custom background prompt metadata' is somewhat vague, and the response structure is not hinted at, leaving slight room for ambiguity.

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?

The tool has zero parameters, and the input schema is empty. Per the rubric, a baseline of 4 applies when there are no parameters, and the description does not need to explain parameter semantics. The listing of returned content (poses, expressions, backgrounds, metadata) adds context beyond the empty schema.

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 uses the specific verb 'Get' with a clear object: 'available selfie poses, expressions, backgrounds, and custom background prompt metadata.' This clearly distinguishes it from sibling tools like agentlux_selfie (which likely generates a selfie) and agentlux_selfie_detail (which retrieves a specific selfie).

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 implies this tool is for retrieving selfie options before generation, but it does not explicitly state when to use it versus alternatives or mention any prerequisites. There is no explicit 'when-to-use' guidance, only an implicit inference from the function name and object.

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