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

No annotations are supplied, so the description carries the full burden of describing behavior. It discloses the key trait that the input is echoed back verbatim and that the tool is a non-mutating probe; however, it says nothing about authentication needs, latency, error behavior, or whether any state changes. This is adequate but thin for a tool with no annotation coverage.

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 short sentence that front-loads the health-check purpose and then states the return behavior. There is no redundant or filler wording.

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 one-parameter probe, the definition covers purpose and return behavior, which is what matters most given that no output schema exists. Minor gaps remain around errors and connectivity prerequisites, but overall the definition is sufficient to call the tool correctly.

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 coverage is 0%, so the description must explain the lone parameter. By saying '原樣回傳訊息', it tells the agent that the message parameter is echoed back unchanged, which adds real meaning beyond the schema's bare string/default/maxLength definition. It does not mention the 1024-character limit or the default value, but the core semantics are covered.

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 states a concrete verb and object: it checks whether the roadsafety MCP server is running and returns the message unchanged. That makes the tool's role as a liveness/echo probe clear; none of the sibling tools are health checks, so the agent can readily tell this tool apart.

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 '確認...是否運作中' implies a connectivity or health-check use case, which is enough for an agent to recognize when to call the tool. However, the description gives no explicit guidance such as when to prefer this tool over a real data tool, or what failure indicates, so the agent must infer most of the context.

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