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 reveals nothing. An agent cannot tell whether this operation reads, transforms, validates, or performs any side effects, nor what behavior to expect on edge cases like empty string arrays.

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 short, but it is under-specified rather than concisely informative. 'Common Suffix: Common Suffix' wastes its single sentence on restating the name instead of using the space to explain function or usage.

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?

The tool has no output schema, no annotations, and an empty input schema, so the description is the only source of information, and it provides almost none. An agent cannot determine what the tool accepts or returns, making this definition inadequate for a utility.

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 has zero parameters, so there are no parameter semantics to document. The '100% schema coverage' is vacuous because the schema is empty; the baseline of 4 for zero-parameter tools applies, though the description adds no value about how invocation works.

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 'Common Suffix: Common Suffix' is a tautology that merely restates the tool name without revealing what the tool actually does, what input it expects, or what output it produces. It does not distinguish itself from the nearby sibling x402-common-prefix beyond the word 'suffix' in the name.

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 about when to use this tool versus alternatives. The description does not mention context, exclusions, or related tools, despite the huge sibling list containing similar string utilities like x402-common-prefix, x402-word-suffix, and x402-longest-common-substring.

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