get_devices

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

The description uses 'Get' which clearly implies a read-only operation. With no annotations provided, the description carries the full burden, and it sufficiently communicates that this tool has no side effects.

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 a single, concise sentence with no redundant words. It front-loads the action and clearly defines the scope.

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 getter with no parameters, the description is sufficient for an agent to understand what the tool does. It does not elaborate on the return format, but that is not strictly necessary for this type of operation.

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 tool has zero parameters, so there is nothing to describe. The schema coverage is complete (100%), and the description does not need to add parameter context. A baseline of 3 is appropriate.

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') and the exact resource ('all Garmin devices associated with the user account'). It is unambiguous and distinguishes from tools that fetch individual device details.

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 implies usage by indicating 'all' devices, but it does not explicitly mention when to use this tool instead of related device-specific tools like get_device_settings or get_primary_training_device. The context is clear but not formally guided.

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