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marc-shade

Crypto Tools MCP Server

by marc-shade

caesar_encrypt

Encrypts plaintext by shifting letters with the Caesar cipher, using a customizable shift value, and returns the ciphertext in JSON.

Instructions

Encrypt plaintext using Caesar cipher.

Args: plaintext: Text to encrypt shift: Number of positions to shift (default: 3)

Returns: JSON with encrypted ciphertext

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
plaintextYes
shiftNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

With no annotations provided, the description bears the full burden of disclosing behavior. It mentions encryption with a shift but omits details like alphabet wrapping, case sensitivity, or handling of non-alphabetic characters, which are important for an agent to invoke the tool correctly.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is extremely concise: a single sentence for the purpose, followed by a minimal parameter list. It is front-loaded with the main action, and every sentence adds value without any waste.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's simplicity and the presence of an output schema (as indicated by context signals), the description is adequate but incomplete. It misses behavioral specifics such as how the shift wraps around the alphabet and how non-letters are treated, which are needed for a fully informed invocation.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must add meaning. It does explain each parameter briefly ('Text to encrypt', 'Number of positions to shift'), which clarifies their purpose beyond the schema's bare titles. However, it lacks details like allowed range for shift or data format.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool encrypts plaintext using the Caesar cipher, specifying the verb 'encrypt' and the resource. It distinguishes itself from sibling tools like caesar_decrypt and caesar_crack by its encryption function.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

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 such as vigenere_encrypt or rot13. It lacks any explicit context or exclusion criteria, leaving the agent without decision-support information.

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

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