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

Annotations declare readOnlyHint=true, openWorldHint=false, idempotentHint=true, and destructiveHint=false, so the agent knows this never mutates system state Gregor. The description's emphasis on streaming previews from the 'design' endpoint adds context not in annotations — this is a preview-only operation, implying no persistent audio output. It's appropriately aligned.

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 sentences with front-loaded purpose statement. The bulk support is a single sentence. No wasted words.

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?

The description is minimal. It identifies the operation (streaming a preview) and bulk support, but given 3 parameters at 0% schema coverage, no output format info, and an agent needing to understand this ElevenLabs flow, it assumes knowledge of '/v1/text-to-voice/design' without explaining required inputs (e.g., what generated_voice_id expects).

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 coverage, the description needs to explain parameters but only mentions generated_voice_id and generated_voice_ids in passing ('Stream a voice preview that was created via the design endpoint'). The 'account' parameter is completely unexplained. Likely sibling of text-to-voice with similar parameter conventions, but this description doesn't document any parameter semantics.

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 title repeats the tool name, but the description clarifies by specifying it streams a voice preview created via the 'text-to-voice/design' endpointhun and mentions batch support. It clearly distinguishes this tool as the streaming variant within a large sibling family of ElevenLabs tools.

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 states the tool streams a preview from the design endpoint, clarifying both action and scope. It also notes batched execution via generated_voice_ids. However, it doesn't mention when streaming is preferable over non-streaming alternatives or detail usage patterns.

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