Get service device approval

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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, covering the safety profile. The description adds no behavioral context beyond that, such as what the approval status looks like or potential errors. Since annotations handle the core transparency, a 3 is fair; it neither contradicts nor enriches them.

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?

A single, grammatically correct sentence that is front-loaded with the verb and resource. No unnecessary words or repetition; it is concise and to the point.

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 read-only operation with no output schema, the description adequately conveys the tool's purpose. The two required parameters are well-documented in the schema, and annotations cover safety. It could hint at the return type (e.g., a boolean or status string), but the name and description are sufficient for an agent to call it correctly.

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 both parameters (serviceName, deviceId) are fully described in the schema, including the deviceId note about nodeId vs nodeKey. The description adds no extra parameter semantics, aligning with the baseline for high schema coverage.

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 clearly states the action (get), the resource (approval status of a specific device for a Tailscale Service), and is distinct from siblings like tailscale_set_service_device_approval (which mutates) and tailscale_get_service (which gets service details). It is specific but doesn't explicitly contrast with alternatives, hence a 4 rather than 5.

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?

No guidance on when to use this tool versus other get tools or the set counterpart. It doesn't state prerequisites (e.g., the device must exist) or when a different tool would be more appropriate. The description is purely a purpose statement without usage context.

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