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

With no annotations provided, the description carries the disclosure burden. It does state the key behavioral consequence—ending the session and releasing resources—but it does not cover side effects, behavior when no session exists, or whether session data is discarded. Adequate but not fully transparent.

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 a single concise sentence that front-loads the action, names the target resource, and gives the main side effect. Every word contributes value and there is no 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?

For a one-parameter lifecycle tool, the description plus schema gives enough to invoke it correctly: action, resource, side effect, and required argument. A note connecting it to ios_start_session or requiring an active session would strengthen it, but nothing critical is missing.

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 fully describes the only parameter, udid, as 'iOS device UDID', so the description does not need to compensate. It also does not add extra meaning, such as how to obtain the UDID or that it should refer to an active session, so it stays at the baseline.

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 'End' with the resource 'iOS automation session on an iOS device' and the consequence 'releasing resources'. This clearly distinguishes it from lifecycle siblings such as ios_start_session and generic device release 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 intended use is implied: call this when an iOS automation session is no longer needed. However, it does not explicitly state prerequisites such as an active session created by ios_start_session, nor does it mention when not to use it or name alternatives.

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