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API Hub MCP — 337+ Tools

by scotia1973-bot
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Remote

hex_to_hsv

Convert hex color codes to HSV (Hue, Saturation, Value) values. Provide the hex color without the '#' symbol.

Instructions

Convert hex color to HSV (Hue, Saturation, Value) values.

Parameters:
    hex_color — Hex color without # (e.g. '3498db').

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": {
      "hex_color": "<hex_color>"
    },
    "name": "hex_to_hsv"
  }
}

Input Schema

NameRequiredDescriptionDefault
hex_colorYes

Output Schema

NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv2.4.1

TDQS

A3.5/5.0
Behavior3/5

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

No annotations provided; description carries full burden. It states input must be hex without '#', but does not disclose output ranges (e.g., 0-360 for hue) or error handling for invalid input. Adequate for a simple conversion but lacks detail.

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?

Two sentences, front-loaded with purpose, parameter in second. No wasted words. Efficient and clear.

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 single-parameter color conversion, the description covers the input format. Output schema exists, so return values need not be described. Lacks error scenarios but sufficient for typical use.

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

Parameters4/5

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

Schema has no parameter description (0% coverage). Description adds 'without #' and an example, clarifying the expected format. This compensates well for the schema gap, though could specify valid characters.

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 clearly states 'Convert hex color to HSV values', specifying the action and output. It distinguishes from sibling tools like hex_to_hsl by explicitly mentioning HSV, though it could be more precise about the HSV value format.

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 on when to use this tool over alternatives like hex_to_hsl or hsv_to_hex. No prerequisites beyond the parameter description. Minimal context for decision-making.

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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