This record as markdown: /tools/io-tinyfn-tinyfn/hello-world.md
What hello_world does on TinyFn
AI agents call hello_world 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 |
|---|---|---|---|
name | string | — | Name to greet |
Parameters from the server's own tool schema.
Why hello_world is rated Low
This is a demonstration/utility tool that produces no side effects. It does not create, modify, delete, or execute arbitrary operations. It falls under Read as the least impactful category for a tool that simply returns information without affecting system state or external resources.
From the tool's definition Tool name 'hello_world' and description 'Hello World as a Service' indicate a simple service that returns a static greeting or demonstration output with no data retrieval, modification, or side effects.
Attacks that exploit this kind of access
The rule that runs hello_world 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 hello_world, this is the rule to start with:
hello_world 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 hello_world call is checked against it from then on.
Questions about hello_world
Hello World as a Service. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
hello_world accepts 1 parameter: name. 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 hello_world: 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.
hello_world 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 hello_world 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 hello_world. 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.
hello_world 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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