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

Annotations already declare readOnlyHint=false, destructiveHint=false, and idempotentHint=false, so the safety profile is covered. The description adds the concrete effect ('Changes that pairing to enabled') but says nothing about reversibility, prerequisites, or permissions beyond the id requirement.

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?

It is short and leads with the usage condition, which is good. However, the first sentence is a run-on ('when the user needs... only when the user explicitly requests it') and 'Changes that pairing to enabled' is grammatically garbled, slightly obscuring the effect statement.

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 single-parameter toggle with a full output schema, an agent has enough to call it correctly: the id source, the effect, and the explicit-request gate are all present. Return-value details are correctly left to the output schema.

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% and the single parameter is documented in the schema as 'Paired computer id returned by list_devices.' The description's 'requires its device id' merely restates that, adding no format or source detail beyond the schema.

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?

States a specific verb (enable) and resource (existing paired computer), and the title reinforces it. It does not explicitly contrast with the inverse sibling disable_device or with remove_device, so sibling differentiation is left implicit.

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?

Gives an explicit gating condition: use it 'only when the user explicitly requests it.' That is strong when-to-use guidance, though it never names an alternative tool or a when-not scenario beyond the user-intent gate.

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