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

With no annotations provided, the description carries the full burden. It states the core behavior—returning the input text to the caller—which is transparent and sufficient for a pure function. It does not mention side effects or return format, but none are necessary given the triviality.

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 zero filler. It places the action first and conveys the complete purpose immediately, achieving maximum conciseness without losing clarity.

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 with one simple parameter and no output schema, the description fully covers what an agent needs to know. There are no hidden behaviors, complex inputs, or alternative paths, so the level of detail is completely adequate.

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 describes the 'text' parameter as 'Text to echo back', and the description merely reiterates that it echoes the text. Since schema coverage is 100%, the description adds no new semantic value beyond what the schema provides, aligning with the baseline of 3.

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 states the verb 'Echoes' and the resource 'provided text', making the tool's function unambiguous. It also implicitly distinguishes itself from siblings like 'add' and 'server_time' by referring solely to text repetition.

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 no explicit guidance on when to use this tool versus alternatives, but for a trivial echo operation the intended use is self-evident. The absence of exclusions or conditional criteria is not misleading, but no active guidance is provided.

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