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

No annotations are present, so the description carries the full burden. It discloses that the tool is state-changing (starts pairing), that the TV displays a 4-digit PIN, that pairing persists across restarts, and that it is one-time per TV. This is meaningful behavioral context beyond the name. It does not mention timeouts or what happens if called on an already-paired TV, so not a 5.

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 with no filler. It opens with the action, immediately explains the visible side effect and next step, then closes with the important persistence/one-time caveat. 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 simple one-parameter, no-output-schema tool, the description provides a complete workflow: start pairing, read PIN from TV, pass to the finish tool, and know it is one-time and persistent. The only gap is the absence of return-value information or behavior on re-airing, but the core context an agent needs is covered.

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%, and the udid parameter is already well explained as accepting an Apple TV UDID, name, or identifier from ios_tv_list. The tool description adds no additional parameter-level detail. Since the schema fully documents the parameter, the baseline 3 applies.

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-resource pair: "Start pairing with an Apple TV," and immediately distinguishes this step from ios_tv_pair_finish by explaining that the PIN is displayed on the TV and must be passed to that sibling tool. It is clear what this tool does and how it differs from the pairing completion step.

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 strong usage context: pairing is required before any other remote call works, it persists across restarts, and it is a one-time step per TV. It also routes the agent to ios_tv_pair_finish with the PIN. It does not explicitly state 'when not to use' or enumerate alternatives, but the one-time persistence implicitly tells the agent not to re-pair an already paired TV.

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