Echo

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

No annotations are present, so the description carries the disclosure burden. It discloses the important behavioral constraint that the tool does not touch the device, implying a safe, server-side probe. However, it does not say that the message is echoed back or describe failure/error behavior; the output schema may cover some of this.

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 a single sentence with no filler. The core purpose and the key distinction from device tools are front-loaded, and every word contributes information.

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?

The tool is very simple, has one optional and self-explanatory parameter, and an output schema is available. The description covers the server-side scope and the no-device safety aspect. It doesn't explicitly describe the echo response or alternative liveness checks, but these are minor given the simplicity and output schema.

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 description makes no mention of the message parameter, and schema description coverage is 0%, so it adds no parameter meaning beyond the schema's name/type/default fields. The parameter is named transparently, but the description still fails to compensate for the absent schema documentation.

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 clearly identifies the tool as a connectivity check for the MCP server itself, which is a specific verb-plus-resource statement. The explicit 'does not touch the device' distinction separates it from the many device-oriented sibling tools, so an agent can tell what it is for.

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 gives a clear usage context: use it to verify MCP server connectivity rather than device state or control. The 'does not touch the device' clause provides a useful exclusion, though it does not name a specific alternative like ping_device or state explicit when-not-to-use conditions.

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