hostinfo_tool

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

There are no annotations, so the description carries the burden of signaling behavior. 'Get host identity info' clearly implies a read-only information retrieval operation with no mutation, which is adequate for a zero-parameter tool. It could be more explicit about side-effect absence, but the wording is sufficient.

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 short and front-loaded, but the second line ('Returns: Hostname, kernel, and OS details') largely repeats the first sentence. This redundancy means not every sentence earns its place.

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?

With zero parameters and an existing output schema, this description is complete for selecting and invoking the tool. It names the resource and the three pieces of returned identity information, and the output schema can cover the return structure.

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 the baseline is 4. The description correctly does not attempt to explain parameters that do not exist, and the empty schema already fully covers the parameter surface.

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 uses a specific verb ('Get') with a clear resource ('host identity info') and enumerates the exact fields returned: hostname, kernel, and OS. This clearly distinguishes it from the sibling unit, journal, and timer tools.

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?

No guidance is given on when to use this tool versus alternatives. It is implicitly the only host-identity tool among the siblings, but the description does not state any context, prerequisites, or scenarios where it should or should not be used.

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