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

No annotations are provided, so the description carries the behavioral disclosure burden. It does reveal a meaningful side effect: successful pairing stores credentials and enables all other remote tools for that TV. However, it does not explain failure behavior, whether repeated calls can overwrite a pairing, or what happens if the PIN is rejected.

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 no filler. The first sentence states the action and prerequisite, the second states the required parameter correlation and the postcondition. Every sentence earns its place.

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 two-parameter completion tool, the description covers the prerequisite, the parameter relationship, and the success effect. It is slightly incomplete on failure/return behavior, but the low complexity and schema coverage make the missing pieces minor rather than blocking.

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 description coverage is 100%, so the schema already documents both udid and pin. The description adds emphasis on passing the 'SAME identifier' used in ios_tv_pair_begin, but that essentially restates the schema's own parameter description without adding new semantic detail.

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 states a specific verb and resource: 'Finish pairing with an Apple TV.' It also references ios_tv_pair_begin, clearly distinguishing this as the second step of the pairing flow and separating it from the many other TV-related tools like ios_tv_status or ios_tv_button.

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 gives concrete usage context: use the PIN shown by ios_tv_pair_begin and pass the same identifier that pair_begin received. It does not explicitly list exclusions or alternative tools, but the pairing precondition is unambiguous and actionable.

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