This record as markdown: /tools/io-tinyfn-tinyfn/random-coin.md
What random_coin does on TinyFn
AI agents call random_coin 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 |
|---|---|---|---|
bias | number | — | Probability of heads (0.5 = fair coin) |
count | integer | — | Number of coin flips |
Parameters from the server's own tool schema.
Why random_coin is rated Low
This tool simply generates a random boolean/outcome (heads or tails), optionally with a bias parameter. It is a pure deterministic-style computation with no external data modification, deletion, execution, or financial impact. Equivalent to a read/query of a random number generator.
From the tool's definition Flip a coin (optionally biased) — generates a random value with no side effects
Attacks that exploit this kind of access
The rule that runs random_coin 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 random_coin, this is the rule to start with:
random_coin 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 random_coin call is checked against it from then on.
Questions about random_coin
Flip a coin (optionally biased). It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
random_coin accepts 2 parameters: bias, count. 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 random_coin: 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.
random_coin 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 random_coin 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 random_coin. 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.
random_coin 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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