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

readOnlyHint=true already declares this is a safe read, so the annotation carries the safety profile. The description adds valuable context that the key must be a DeviceGuid, not the AgentID, and maps to the two Atera API endpoints. It does not describe return format or pagination, so beyond annotations it adds moderate but not rich behavioral detail.

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?

Two sentences plus an API reference, all front-loaded. Every clause earns its place: scope, mode distinction, identifier sourcing, and endpoint mapping.

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 two-parameter read tool with full schema coverage and no output schema, the description covers the important correctness risk (which ID to pass) well. It could note the return shape or that 'kind' defaults to available, but nothing critical for correct invocation is missing.

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 the baseline is 3, but the description adds a genuinely useful semantic clarification: the identifier is the device's DeviceGuid, explicitly not the AgentID, which prevents a common wrong-parameter error. The available/installed meaning is echoed but is already covered by the enum description.

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 states a specific verb (list) and resource (Windows/OS patches) scoped to one device, and explicitly distinguishes the two modes (AVAILABLE vs INSTALLED). An agent can tell this apart from siblings like atera_get_agent without opening the schema.

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?

It gives clear context: use this on a single device identified by DeviceGuid, and it names where that ID comes from (atera_list_agents / atera_get_agent). It stops short of stating when NOT to use it versus alternatives, but the usage path is unambiguous.

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