atbash_cipher

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

No annotations are provided, so the description must fully disclose behavior. It states it is a cipher but omits important details like whether non-alphabetic characters are preserved, case sensitivity, or that it is symmetric (encoding=decoding). The behavior is implied but not explicitly stated.

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 concise with two sentences and one parameter line, front-loading the core purpose. There is no superfluous text. However, it could be slightly more structured with explicit output info.

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 is simple, with one parameter and an output schema. The description covers the basic purpose and parameter but does not explain return values or edge cases. Since an output schema exists, the lack of return description is somewhat mitigated, but behavior on non-letters is missing.

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 has no descriptions for the 'text' parameter (0% coverage). The description adds a line explaining that 'text' is the input to encode/decode. This provides basic meaning but lacks specifics about valid characters, case handling, or formatting.

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 it applies the Atbash cipher for encoding/decoding, specifying the substitution pattern (A↔Z, B↔Y). It uses a specific verb+resource combination. However, it does not differentiate from sibling cipher tools like caesar_cipher or vigenere_cipher, which is a minor gap.

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 simply says 'Use this to encode or decode...' without mentioning conditions, prerequisites, or exclusions. Given many sibling cipher tools, this is insufficient.

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