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

With no annotations, the description carries the full burden. It discloses that it stops the device from counting against the limit and immediately stops streaming, and notes automatic expiry. It does not mention any side effects beyond these, but they are the primary behaviors an agent would need to know. Lacks detail on permissions or reversibility, but for a simple release action this is sufficient.

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 three sentences, front-loading the core purpose and then adding important behavioral details. No wasted words. It is efficiently structured and easy to parse.

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 tool has a single parameter, no output schema, and the description covers the purpose, the effects, and the trigger for use. It is complete for an agent to understand when and how to invoke 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?

The schema has 100% coverage for the single parameter 'udid' with a clear description. The tool description does not add extra meaning to the parameter, but since the schema fully documents it, the baseline of 3 is appropriate. No additional guidance is needed.

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 clearly states the action: releasing a hold on a device, and explains the consequences (stopping the count against parallel-device limit and tearing down the control session). It names the resource (device) and the action (release), and is unambiguous. It stands apart from the many device_* tools because it focuses on releasing a hold.

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?

Explicitly says 'Call this when finished with a device,' which is a clear trigger for use. It also mentions that holds expire automatically after an idle period, giving context. However, it does not explicitly state when NOT to use it or mention any alternatives, though no obvious sibling exists for this function.

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