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

No annotations are provided, so the description must carry the full behavioral burden. It says nothing about read-only nature, output format, computational constraints, or error handling. The description is completely silent on behavior.

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 short but not concise in a useful way; it is merely a redundant restatement. There is no structure or front-loading of actionable information.

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 a tool with three parameters, no annotations, no output schema, and a very sparse description, the definition is inadequate. An agent cannot determine what the tool returns, how to interpret k, n, and values, or when to select it over numerous sibling tools.

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%, with k, n, and values each having a brief 'to process' description. The tool description adds no param meaning beyond the schema, which is acceptable given the high coverage, but the schema descriptions themselves are minimal and the tool description does nothing to compensate.

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 "Combinations: Combinations" is essentially a tautology that restates the tool name without specifying what it computes. It does not clarify whether it returns the count of combinations, the actual combination list, or something else, and it fails to distinguish from siblings like x402-combination-count or x402-permutations.

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. The description provides no context, prerequisites, or mention of related tools such as x402-combination-count or x402-permutations that could be confused with this one.

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