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API Hub MCP — 337+ Tools

API Hub MCP — 337+ Tools

by scotia1973-bot
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Remote

hsv_to_hex

Translate HSV color values (hue, saturation, value) into a hex color code for use in web design and development.

Instructions

Convert HSV values to hex color.

Parameters:
    hue — Hue angle (0-360).
    saturation — Saturation percentage (0-100).
    value — Value/Brightness percentage (0-100).

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": {
      "hue": "<hue>",
      "saturation": "<saturation>",
      "value": "<value>"
    },
    "name": "hsv_to_hex"
  }
}

Input Schema

NameRequiredDescriptionDefault
hueYes
saturationYes
valueYes

Output Schema

NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv2.4.1

TDQS

B3.3/5.0
Behavior2/5

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

With no annotations, the description carries full burden. It lists parameter ranges but does not disclose output format (e.g., with or without '#'), clamping behavior, or error handling. Minimal beyond purpose.

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?

Extremely concise: one sentence for purpose, then a clean list of parameters. No unnecessary words, front-loaded purpose.

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?

Covers input parameters adequately but omits output format details (e.g., 'returns hex string like #FF0000'). Given output schema exists, description could still clarify return structure.

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 description adds basic meaning to parameters (e.g., 'Hue angle (0-360)') which the schema lacks (0% coverage). However, it does not provide detailed constraints or examples.

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 ('Convert') and the specific conversion (HSV to hex), distinguishing it from sibling color conversion tools like cmyk_to_hex, hex_to_hsl, etc.

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 versus alternatives. The description only explains functionality without context or exclusion criteria, leaving the agent to infer usage.

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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