Rgb To Hex: Convert rgb to hex. 🆓 5 free trial calls per signed wallet
This tool declares no required parameters. Add optional parameters from the input schema as needed.
{
"id": 1,
"jsonrpc": "2.0",
"method": "tools/call",
"params": {
"arguments": {},
"name": "x402-rgb-to-hex"
}
}| Name | Required | Description | Default |
|---|---|---|---|
| b | No | ||
| g | No | ||
| r | No |
Changes observed during successful MCP inspections.
Input schema / properties / b / descriptionRemoved value: -"B to process"Input schema / properties / g / descriptionRemoved value: -"G to process"Input schema / properties / r / descriptionRemoved value: -"R to process"Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full disclosure burden. It reveals the billing model (5 free trial calls per signed wallet), which is genuinely useful context, but says nothing about input validation, accepted value ranges, error behavior, or what the returned hex looks like (with or without '#' prefix). For a conversion tool with no annotation coverage, this is a significant gap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The operative sentence is front-loaded and minimal. The emoji-decorated promotional clause is extra but short and doesn't obscure the core statement.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
There is no output schema and no annotation coverage, so the description is the only place to learn input format and return shape — and it covers neither. For such a simple tool this is low-cost to fix, but as written an agent cannot confidently invoke it without guessing the value format.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 0% and the three parameters r, g, b are bare strings with no constraints. The description adds nothing about whether values are decimal 0-255, percentages, or a combined 'rgb(...)' string, which is exactly the ambiguity an agent would hit when filling these string-typed fields. It does not compensate for the coverage gap.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description names a specific verb and resource ('Convert rgb to hex') that matches the tool name exactly, so an agent knows precisely what transformation happens. It doesn't explicitly distinguish itself from the sibling x402-hex-to-rgb or mention the related color tools (x402-hex-to-hsl, x402-color-converter), but the direction of conversion is unambiguous.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
There is no guidance on when to use this versus the reverse direction or the broader color-converter siblings, and no preconditions are stated. The only contextual sentence is a pricing note about free trial calls, which does not help select the tool.
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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