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 of behavioral disclosure. It states the tool echoes a message back with an optional uppercase transformation, but it doesn't cover other behavioral traits such as whether it's read-only or destructive, any rate limits, error handling, or authentication needs. This leaves significant gaps in understanding how the tool behaves beyond its basic function.

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 extremely concise and front-loaded: 'Echo a message back, optionally in uppercase.' It uses a single sentence that efficiently conveys the core functionality without any wasted words, making it easy to understand at a glance.

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 tool's low complexity and lack of annotations or output schema, the description is incomplete. It covers the basic purpose but misses key contextual details such as behavioral traits, usage guidelines, and fuller parameter explanations. For a tool with no structured support, the description should do more to compensate, but it falls short.

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 schema description coverage is 50% (only 'message' has a description, 'uppercase' does not). The description adds minimal value by mentioning 'optionally in uppercase,' which hints at the 'uppercase' parameter's purpose but doesn't provide detailed semantics like default behavior or effects. Since schema coverage is moderate, the baseline is 3, and the description only slightly compensates for the gap.

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 tool's purpose: 'Echo a message back, optionally in uppercase.' It specifies the verb ('echo') and resource ('message'), and the optional uppercase transformation adds specificity. However, it doesn't differentiate from sibling tools like 'add', 'cache', or 'status', which likely have different functions, so it doesn't fully achieve sibling differentiation.

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. It mentions the optional uppercase feature but doesn't explain scenarios where this tool is appropriate compared to siblings like 'add' or 'cache', nor does it specify any prerequisites or exclusions for usage.

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