This record as markdown: /tools/io-tinyfn-tinyfn/hsl-to-hex.md
What hsl_to_hex does on TinyFn
AI agents call hsl_to_hex to retrieve information from TinyFn without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
h | integer | Yes | Hue (0-360) |
l | integer | Yes | Lightness (0-100) |
s | integer | Yes | Saturation (0-100) |
Parameters from the server's own tool schema.
Why hsl_to_hex is rated Low
This is a pure data transformation utility that converts color values from HSL (Hue, Saturation, Lightness) format to hexadecimal format. It retrieves and transforms input data without creating, modifying, deleting, or executing any external operations. No state changes occur, making it a Read category tool with low severity risk.
From the tool's definition Tool name 'hsl_to_hex' and description 'Convert HSL to hex color' indicate a deterministic color format conversion operation with no side effects.
Attacks that exploit this kind of access
The rule that runs hsl_to_hex safely
PolicyLayer is an MCP gateway: it sits between your AI agents and TinyFn, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For hsl_to_hex, this is the rule to start with:
hsl_to_hex is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect TinyFn, apply this rule, and every hsl_to_hex call is checked against it from then on.
Questions about hsl_to_hex
Convert HSL to hex color. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
hsl_to_hex accepts 3 parameters: h, l, s. Required: h, l, s. The full parameter table on this page comes from the server's own tool schema.
Register the TinyFn MCP server in PolicyLayer and add a rule for hsl_to_hex: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches TinyFn. Nothing to install.
hsl_to_hex is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the hsl_to_hex rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for hsl_to_hex. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
hsl_to_hex is provided by the TinyFn MCP server (https://api.tinyfn.io/mcp/all/). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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