This record as markdown: /tools/io-tinyfn-tinyfn/hex-decode.md
What hex_decode does on TinyFn
AI agents call hex_decode 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 |
|---|---|---|---|
encoded | string | Yes | Hex string to decode |
Parameters from the server's own tool schema.
Why hex_decode is rated Low
This is a deterministic utility function that performs reversible data decoding. It reads input, transforms it, and returns output without modifying any state, creating/deleting data, executing code, or moving resources. It falls clearly into the Read category as a data retrieval and transformation tool.
From the tool's definition Tool name 'hex_decode' and description 'Decode hexadecimal to text' indicate a data transformation/decoding operation with no side effects. It retrieves and converts encoded data to readable text format.
Attacks that exploit this kind of access
The rule that runs hex_decode 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 hex_decode, this is the rule to start with:
hex_decode 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 hex_decode call is checked against it from then on.
Questions about hex_decode
Decode hexadecimal to text. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
hex_decode accepts 1 parameter: encoded. Required: encoded. 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 hex_decode: 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.
hex_decode 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 hex_decode 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 hex_decode. 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.
hex_decode 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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