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DouglasGBailey

Calculator MCP Server

reverse_string

Reverse a text string by providing the text as input. Use it to create mirrored text, check palindromes, or reorder characters.

Instructions

Reverse a string of text

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
textYesThe text to reverse

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

B3.4/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full behavioral burden, and it discloses nothing beyond the tautological restatement of the name. It does not mention edge cases such as empty strings, Unicode/grapheme handling, or surrogate pairs, which are the only meaningful behavioral questions for a string reversal.

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?

A single six-word sentence that front-loads the verb and resource with zero padding. Nothing could be removed without losing meaning.

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

Completeness4/5

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

For a one-parameter, non-nested tool with no output schema, the definition is nearly sufficient: the return value (the reversed string) is strongly implied. A brief note on return shape or Unicode handling would close the remaining gap.

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 100% and the single parameter ('text') is already documented in the schema as 'The text to reverse'. The description adds no format, encoding, or constraint details beyond what the schema provides, so the baseline of 3 applies.

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

Purpose4/5

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

The description states a specific verb and resource ('Reverse a string of text'), making the operation immediately clear. It does not explicitly differentiate itself from siblings, but the siblings (add, subtract, multiply, divide) are unrelated arithmetic tools, so no differentiation is needed.

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

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no explicit when-to-use or when-not-to-use guidance. However, for a trivial pure-string operation whose purpose is unambiguous, the usage is strongly implied by the name and description.

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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