echo_multiple

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

With no annotations, the description carries the full burden. It discloses the output structure (multiple TextContent blocks) and the one-to-one mapping, which is useful behavioral context, but it omits edge cases (empty input), ordering guarantees, and any safety profile.

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?

A single front-loaded sentence with zero waste; it is appropriately sized for a trivial echo tool.

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 simple input schema and the presence of an output schema, the description is adequate for invocation. However, without annotations and with many echo siblings, it lacks routing guidance and edge-case behavior, leaving clear gaps.

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 0% for the single 'messages' parameter. The description adds the semantic that each element produces one content block, but it does not describe the expected format (array of strings) or constraints, leaving most meaning to the schema's type definition.

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 states a specific verb ('Return') and resource ('TextContent blocks') with a clear mapping ('one per message'). It does not explicitly differentiate itself from the sibling 'echo' or other echo variants, so it falls short of the top score.

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?

There is no guidance on when to use this tool versus alternatives like 'echo' or 'echo_nested'. The description is a pure behavior statement with no context or exclusions.

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