Echo

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

With no annotations provided, the description must carry the behavioral burden, and it does so adequately by stating the input is returned unchanged, implying a pure, side-effect-free round-trip. It does not explicitly state the absence of side effects or latency characteristics, which keeps it short of a 5.

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?

Two short sentences with zero filler, and the behavioral statement is front-loaded ahead of the usage hint. Every sentence 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 one-parameter, no-output-schema round-trip tool, the description covers purpose and the primary use case sufficiently. Minor gaps such as confirming no side effects or that the response mirrors the request are low-risk given the tool's simplicity.

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 100% and there is a single required string parameter already documented as "Text to return unchanged". The description restates the same meaning rather than adding format, length, or encoding details, so the baseline 3 applies.

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 uses a specific verb+resource pairing ("Return the input text unchanged") that unambiguously describes the operation. It does not differentiate from siblings (now, uuid), but those siblings are distinct enough that no differentiation is needed.

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?

"Use this to confirm the server is connected" gives explicit when-to-use guidance for the primary scenario. It lacks exclusions or named alternatives, but for a connectivity check there is no competing sibling that would warrant them.

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