monitor_disk_io

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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is established. The description adds no behavioral details beyond that, such as whether rates are instantaneous or averaged, what units are returned, or whether historical data is included. It neither contradicts annotations nor enriches them.

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, short phrase with no wasted words, so it is very concise. However, it is a sentence fragment without a verb, and it front-loads the key scoping ('per-disk') effectively yet could be considered too sparse.

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?

Even with low complexity, the absence of an output schema and the terse description leave key questions unanswered: what exact metrics are returned (IOPS, throughput), what time window is covered, and whether it is a one-shot snapshot or a streaming monitor. The description is insufficient for an agent to predict the tool's response.

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 Apa, and schema coverage is trivially 100%. With no parameters, the description has no responsibility to clarify argument semantics. Baseline of 4 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?

The description 'Per-disk I/O rates' clearly identifies the resource and metric, and the 'per-disk' scope distinguishes it from sibling tools like monitor_network_io and get_disk_usage. However, it lacks an explicit verb, so it reads as a label rather than a full statement of 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?

There is no guidance on when to use this tool versus alternatives. It does not mention more appropriate tools for disk usage (get_disk_usage) or other monitors, nor any context like performance troubleshooting or real-time monitoring. The agent is left to infer usage from the name.

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