This record as markdown: /tools/io-tinyfn-tinyfn/punycode-decode.md
What punycode_decode does on TinyFn
AI agents call punycode_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 | Punycode to decode |
Parameters from the server's own tool schema.
Why punycode_decode is rated Low
Punycode decoding is a deterministic string transformation that converts encoded domain names to Unicode representation. It retrieves no data from external sources, modifies no state, executes no code, and performs no destructive or financial operations. This is a read-like utility function (decode operation) with no blast radius if misused by an AI agent.
From the tool's definition Tool name is 'punycode_decode' and description states 'Decode Punycode to Unicode' — a pure data transformation with no side effects, state changes, or external operations.
Attacks that exploit this kind of access
The rule that runs punycode_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 punycode_decode, this is the rule to start with:
punycode_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 punycode_decode call is checked against it from then on.
Questions about punycode_decode
Decode Punycode to Unicode. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
punycode_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 punycode_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.
punycode_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 punycode_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 punycode_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.
punycode_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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