ping

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

With no annotations provided, the description carries the burden of disclosing behavior. It states the tool echoes a message back with a server tag, implying no state changes or side effects. It also frames the tool as a temporary placeholder, which is useful behavioral context. It doesn't detail failure modes, but for a simple health-check ping, the behavior is transparent enough.

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 two sentences with no redundant phrasing. The first sentence front-loads the primary behavior, and the second adds the usage context. Every word earns its place, making it an example of concise yet informative documentation.

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 tool with one optional parameter, no annotations, and no sibling tools, the description covers purpose, usage, and behavior sufficiently. The presence of an output schema means return value explanation is unnecessary. The description even notes this is a precursor to future S1000D tooling, which gives the agent clear context on when to invoke it.

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 must compensate for the undocumented 'message' parameter. The phrase 'echoes a message back' directly relates the message parameter to the tool's function, adding some semantic meaning. However, it does not describe formatting, constraints, or the default value, and the parameter semantics are left mostly to inference from the parameter name and schema.

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 opens with 'Health-check tool' and specifies the exact behavior: 'echoes a message back with a server tag.' This clearly distinguishes it as a connectivity/round-trip verification tool, and the purpose is not lost in vague language. Even though there are no sibling tools to differentiate from, the description fully states what the tool does.

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 description explicitly states when to use it: 'Used to confirm the server is reachable and a tool call round-trips correctly, before real S1000D tooling is added.' This gives a clear usage context. It does not mention alternatives, but with no sibling tools that would be unnecessary, so the guidance is adequate.

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