This record as markdown: /tools/io-tinyfn-tinyfn/reverse-string.md
What reverse_string does on TinyFn
AI agents call reverse_string 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 |
|---|---|---|---|
text | string | Yes | The text to reverse |
Parameters from the server's own tool schema.
Why reverse_string is rated Low
This is a deterministic utility function for string manipulation. It takes a string as input and returns its reverse without modifying any stored data, executing code, or triggering external effects. This falls squarely into the Read category—a pure function that transforms and retrieves output without causing mutations or side effects.
From the tool's definition Tool name 'reverse_string' and description 'Reverse a string' indicate a string transformation operation that reads input and returns a derived value with no side effects, data modification, or external operations.
Attacks that exploit this kind of access
The rule that runs reverse_string 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 reverse_string, this is the rule to start with:
reverse_string 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 reverse_string call is checked against it from then on.
Questions about reverse_string
Reverse a string. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
reverse_string accepts 1 parameter: text. Required: text. 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 reverse_string: 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.
reverse_string 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 reverse_string 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 reverse_string. 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.
reverse_string 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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