echo

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

No annotations are provided, so the description carries the full burden. It discloses that no authentication is required, which is a behavioral trait. However, it does not mention other potential behaviors like side effects, idempotency, or response format. For an echo tool, the behavior is simple, but the description 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, short sentence that is front-loaded and contains no unnecessary words. It is highly concise and structured effectively for quick comprehension.

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?

Given the simplicity of the tool (no siblings, no output schema, one parameter), the description is adequate but lacks some details such as what the echoed response contains. It is minimally complete but leaves some ambiguity about the exact behavior.

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 parameter 'message' has no description in the schema (0% coverage). The tool description does not explain what the parameter does or what format it expects. Since schema coverage is low, the description should compensate, but it fails to add any meaning beyond the parameter name.

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 'Echo a simple message' clearly states the verb ('echo') and resource ('a simple message'), matching the tool name. It also adds the context of no authentication required. While it is somewhat tautological, it is specific enough for a simple tool.

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 provides no guidance on when to use this tool versus alternatives. There are no sibling tools mentioned, and it does not specify any conditions for use or exclusion criteria. The only usage hint is 'no authentication required', which is more of a behavioral trait than usage guidance.

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