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

Annotations declare readOnlyHint=true, and the description usefully enumerates the response payload (device inventory, online status, IPs, OS build, last reboot), which matters because no output schema exists. It stops short of noting error behavior for an unknown AgentID or any auth/permission requirements, so it is helpful but not complete.

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?

One tight sentence carrying the action, key, and return contents, plus a compact endpoint citation. Nothing is padded and the most important information is front-loaded.

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 single-entity fetch with a fully documented parameter and annotations covering safety, the description supplies what the structured fields cannot: the shape of the returned data. Only minor gaps remain (unknown-ID behavior, permissions), so it is nearly complete for this tool's complexity.

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 single parameter is fully documented in the schema (100% coverage), including its integer type and bounds. The description's 'by its AgentID' merely restates the parameter's meaning rather than adding format or lookup guidance, so the baseline 3 applies.

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?

States a specific verb ('Fetch') and resource ('a single agent'), scoped by 'AgentID'. The word 'single' implicitly distinguishes it from the sibling atera_list_agents, and it enumerates the returned fields (inventory, online status, IPs, OS build, last reboot), leaving no ambiguity about what the call resolves to.

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 phrase 'by its AgentID' implies the tool is used when a specific agent identifier is already known, which is the right context. However, it never states when to reach for this over atera_list_agents or atera_find_agents_by_machine, nor any preconditions, so usage is only implied.

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