echo

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

No annotations are provided, so the description carries the full behavioral disclosure burden. It does state the core behavior—returning the input text—but it does not explicitly mention side-effect freedom, output format, or behavior for empty or unusual input. Nothing contradicts the annotations, but the disclosure is minimal.

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 concise sentence with no filler words, and the core action is front-loaded. It is appropriately sized for a one-parameter utility and every word 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 trivial echo tool with one fully documented required parameter, the description is nearly complete. An agent can invoke it correctly without further context. A short example or an explicit statement that no transformation occurs would make it fully complete, but nothing essential is missing.

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 input schema already provides 100% coverage with the parameter description 'Text to echo back', so the description adds no additional parameter semantics. This is a baseline case where the schema handles the semantics and the description has no further burden.

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, 'Echo back', and a clear resource, 'input text', making it plain that the tool returns the provided text unchanged. It is self-evidently distinct from siblings like hash, base64, and timestamp because it performs no transformation, though it does not explicitly call out that contrast.

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 implies the use case: pass text and receive it back unchanged. However, there is no explicit guidance on when to use this tool versus alternatives, no exclusions, and no mention of edge cases. For such a trivial utility this is acceptable, but usage inference is left entirely to the agent.

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