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

With no annotations provided, the description carries the full burden of behavioral disclosure, and it discloses nothing: no input expectations, no return shape, no complexity characteristics, no edge-case behavior. An agent has no basis to predict what invoking this tool will do.

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?

Extreme brevity is not conciseness—this is under-specification. The description contains only a re-statement of the title with a colon, which earns no value and wastes the only opportunity to inform the agent.

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 no annotations, no output schema, and an empty input schema, the description is the sole source of information, and it provides none. An agent cannot know what input to provide, what the output will be, or how this differs from a dozen sibling sort tools; this is completely inadequate.

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 tool has 0 parameters, so per baseline there is nothing the description needs to add about parameters. However, the empty schema combined with the empty description leaves the actual input mechanism (how the list to sort is supplied) completely unspecified—a real gap the description does nothing to close.

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 'Insertion Sort: Insertion Sort' is a pure tautology—it merely restates the tool name and adds zero information about what the tool does. It provides no verb+resource, no input specification, and does nothing to distinguish it from sibling sorting tools like x402-bubble-sort, x402-quick-sort, and x402-merge-sort.

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?

No guidance is given on when to use this tool versus alternatives. The description offers no context, no exclusions, and no mention of the input format (presumably an array) or when insertion sort would be preferred over the many other sort tools in the sibling list.

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