vigenere_cipher

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

With no annotations, the description carries the full burden of disclosing behavior. It only states a price ($0.001 USDC via x402) and does not describe whether the tool encrypts, decrypts, requires a key, or any side effects. The agent is left completely in the dark about what invoking this tool does.

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 this is under-specification rather than effective conciseness. A single sentence that only names the tool and its price does not earn its place as a useful description; it omits essential information while providing no structural clarity.

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 complexity (a cipher requiring text and key inputs), the description is completely inadequate. There is no output schema, no parameter documentation, no usage context, and no differentiation from sibling tools. The bare mention of cost is the only meaningful detail.

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 contains only a generic 'params' object with no tool-specific properties, and the description does not clarify what parameters are expected (e.g., text, key, mode). Schema coverage is effectively zero for actual parameters, and the description adds 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 merely restates the tool name ('vigenere cipher') and categorizes it as an 'Other Utilities tool.' It lacks a verb or resource, giving no indication of what the tool actually does (encrypt/decrypt text with a Vigenere cipher). This is a tautology that fails to distinguish it from sibling cipher tools.

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 or how it differs from alternative cipher tools like caesar_cipher, atbash_cipher, or rot13_cipher. It only mentions a cost, which does not help an agent decide when to invoke it.

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