Add Devices to Group

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

Annotations already include idempotentHint=true and destructiveHint=false, but the description goes further by detailing the merge semantics, no duplicate behavior, and the no-op for empty/None lists. This gives agents confidence in side effects beyond the annotations.

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 well-structured, front-loaded with the purpose, and every sentence contributes essential information. It is concise yet thorough, covering purpose, key parameter behavior, and edge cases without redundancy.

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?

Given the tool's simplicity (2 params, no nesting) and the presence of an output schema, the description fully explains the operation's behavior and prerequisites. It covers error-prone details like empty lists and idempotency, making it complete for an agent to use 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 coverage is 100%, so baseline is 3. The description adds meaningful semantics: 'name' must be a valid group (with pointer to get_device_groups), and 'devices' is described as additive, idempotent, and no-op for empty lists. These nuances are not in the schema, elevating the value.

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 opens with a specific verb+resource: 'Add one or more devices to a device group.' It clearly distinguishes this from siblings like remove_devices_from_group and get_device_groups, and the title reinforces the action.

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 clear context on when to use this tool: to add devices to a named group. It instructs users to verify the group name via get_device_groups and explains the additive/idempotent behavior, implying this is the right choice for augmenting a group without replacing it. No explicit alternative exclusions, but strong contextual guidance.

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