list_hosts

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

With no annotations, the description carries the full burden, and it does add one genuinely useful trait: the list is static configuration from an environment variable, not live network discovery. However, it says nothing about ordering, whether the env var being unset yields an empty list or an error, or what authentication/connectivity is implied.

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?

A single front-loaded sentence with no filler; the verb, resource, and data source all appear before any trailing detail, and every clause 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?

For a trivial zero-parameter read tool with no output schema, the description covers what is returned (the configured servers) and where it comes from. The only meaningful gap is behavior when HOMELAB_HOSTS is unset or malformed, which an agent would need to know to handle the empty-result case.

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 takes zero parameters, which is the baseline-4 case per the rubric; the description correctly signals that no filtering or arguments are accepted. There is nothing further for it to document here.

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 ('List') and resource ('remote servers'), plus the exact configuration source (HOMELAB_HOSTS env var), so the agent knows precisely what is enumerated. It does not explicitly distinguish itself from siblings like system_info or service_status, which also read host-level state, but the resource is narrow enough to be unambiguous.

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?

Usage is implied rather than stated: an agent can infer this is the discovery step before targeting a specific host, but there is no explicit when-to-use, when-not-to-use, or named alternative among the siblings. No prerequisites or failure conditions are mentioned.

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