Tag devices

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

The annotations already indicate non-read-only, non-idempotent, and open-world behavior, but the description adds nothing beyond the API endpoint. It does not disclose potential side effects, authentication requirements, or what happens when a tag is applied to an already-tagged device. The openWorldHint=true is not explained.

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 extremely short, but the first two sentences ('Tag devices' and 'Applies a tag to the provided devices') are redundant. The API endpoint is a useful addition. Slight redundancy prevents a perfect score.

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 two-parameter tool with full schema coverage, the description is adequate for basic invocation. However, it lacks information about side effects, response, or how it contrasts with removeTagFromDevices, which is relevant given the sibling context. A bit more context would improve completeness.

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?

The input schema fully describes both parameters (id and device_ids) with clear descriptions, and the description adds no additional semantic value. Per the baseline for high schema coverage, this scores a 3.

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 ('Tag devices') and the object ('the provided devices'), making the tool's purpose immediately recognizable. However, it does not explicitly differentiate from sibling tools like removeTagFromDevices, though the opposite nature is implicit. The API endpoint adds specificity.

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 provides no guidance on when to use this tool versus alternatives such as removeTagFromDevices or listTags. It simply states what it does, leaving the agent to infer usage context. No prerequisites or exclusions are mentioned.

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