pair_device

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

With no annotations, the description carries the full behavioral disclosure burden. It explains the interactive QR-code mechanism and positions the tool as onboarding, but it omits side effects such as replacing an existing pairing, session expiration, and what happens after the QR code is scanned.

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?

Three short, purposeful sentences with no filler. The core action and immediate QR-code behavior are front-loaded, and the first-step context is useful rather than redundant.

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 low-complexity tool with one optional parameter and no output schema, the description gives a clear, largely complete picture of the tool's role and interactive flow. A minor gap is the lack of return-format or QR-expiry details, but the tool is simple enough that this is not a significant omission.

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 coverage is 100%: device_name is already documented as an optional friendly name for the pairing session. The description adds no parameter detail, which is acceptable at the baseline because the schema fully covers it.

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?

Uses a specific verb 'Pair' with a clear resource ('your phone') and states the goal of receiving notifications. The QR-code flow and 'first step for new users' framing distinguish it from sibling management, status, and notification 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?

Explicitly describes this as the first step for new users, giving an agent clear context about when to invoke it relative to setup and notification tools. It does not name exclusions or alternatives, but the usage context is clear enough.

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