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

No annotations are provided, so the description carries the full burden. 'Echoes the provided text back to the caller' fully discloses the observable behavior and implies no side effects or mutations. There is no hidden state or destructive action to warn about.

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 efficient sentence with no filler. It is immediately clear 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 tool this simple, the description plus schema completely cover what an agent needs: the single required parameter is documented, and the return behavior ('echoes back') is stated. No output schema is necessary because the result is the same text.

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 100%: the input schema already documents the 'text' parameter as 'Text to echo back'. The description adds only the word 'provided', so it provides no meaningful semantic value beyond the schema, but the schema fully compensates.

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 ('Echoes') and a clear resource ('the provided text'), stating exactly what the tool does. It is immediately distinguishable from siblings like add and server_time, so an agent can select it without ambiguity.

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 through the verb 'echoes', but it does not explicitly state when to prefer this tool over alternatives or mention any exclusions. For a trivial utility this is adequate, though no direct guidance is provided.

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