This record as markdown: /tools/io-tinyfn-tinyfn/flip-coin.md
What flip_coin does on TinyFn
AI agents call flip_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 |
|---|---|---|---|
count | integer | — | Number of flips |
Parameters from the server's own tool schema.
Why flip_coin is rated Low
Although the tool produces non-deterministic output (random), it falls under Read because it has no side effects: it does not create, modify, delete, execute code, or commit financial transactions. It merely returns a value.
From the tool's definition Tool name is 'flip_coin' with description 'Flip a coin.' This is a random number generation utility with no side effects—it retrieves/generates a random value (heads or tails) without modifying any data or triggering external operations.
Attacks that exploit this kind of access
The rule that runs flip_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 flip_coin, this is the rule to start with:
flip_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 flip_coin call is checked against it from then on.
Questions about flip_coin
Flip a coin. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
flip_coin accepts 1 parameter: 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 flip_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.
flip_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 flip_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 flip_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.
flip_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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