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API Hub MCP — 337+ Tools

by scotia1973-bot
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Remote

invert_case

Transforms text by flipping the case of each letter: uppercase to lowercase and lowercase to uppercase.

Instructions

Invert the case of each character (upper->lower, lower->upper).

Parameters:
    text — Text to invert case of.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "text": "<text>"
    },
    "name": "invert_case"
  }
}

Input Schema

NameRequiredDescriptionDefault
textYes

Output Schema

NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv2.4.1

TDQS

A3.6/5.0
Behavior3/5

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

The description is straightforward and accurately describes the transformation. However, with no annotations, it relies entirely on the description for behavioral traits. It does not mention how non-alphabetic characters are handled, but the core behavior is clear. A score of 3 reflects that it is adequate but could be more explicit.

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 with two sentences that front-load the key information. Every word adds value; there is no fluff. The structure is efficient for an AI agent to parse quickly.

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 simple text transformation tool with an output schema, the description covers the essential transformation logic. It does not elaborate on edge cases (e.g., empty string, numbers) but given the tool's simplicity and the presence of an output schema, it is largely complete. A score of 4 acknowledges minor gaps like lacking a note on non-alphabetic characters.

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?

The schema has 0% description coverage for the parameter, so the description must compensate. It adds a brief description ('Text to invert case of') which clarifies the parameter's purpose. This is minimal but sufficient for a simple string parameter; a more detailed example or constraint could improve it.

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 action (invert case) and the resource (each character), with a specific definition (upper->lower, lower->upper). It is precise and leaves no ambiguity about what the tool does, distinguishing it from siblings like 'alternating_case' or 'capitalize_text' despite not explicitly naming alternatives.

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?

No guidance is provided on when to use this tool versus similar case transformation tools (e.g., 'swap_case', 'convert_case', 'alternating_case'). The agent has no context to differentiate its use case, which is important given the many siblings in this domain.

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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