list_directory_servers

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

With no annotations, the description must carry the behavioral burden. It does indicate a read-only GET request and that the servers are 'known', which is a helpful safety signal. However, it does not explain the timeout parameter's effect, whether network access is expected, or any response behavior beyond the output schema.

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 extremely short and front-loaded, with no filler. The endpoint annotation in parentheses is a compact way to communicate the retrieval mechanism. It sacrifices some useful detail, but what is present is well-structured.

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 one-optional-parameter tool with an output schema, the description is minimally adequate: the resource is identified and the HTTP method is shown. It is incomplete on usage guidance and timeout semantics, but the low complexity of the tool keeps the gap from being severe.

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 description coverage is 0%, so the description needed to explain the timeout parameter, but it does not mention it at all. The only compensation is that 'timeout' is a fairly self-explanatory parameter name, and the schema provides a default value; no units or behavioral meaning are added.

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 identifies the resource ('known directory mirror servers') and the HTTP endpoint (GET /json/servers), which is enough to distinguish it from the many list_* siblings that target different resources. It relies on the tool name's 'list' verb rather than stating an explicit verb, so it is clear but not maximally explicit.

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 about when to use this tool or when to prefer one of the many sibling listing tools. The description simply states what the tool returns, leaving the agent to infer appropriate usage.

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