This record as markdown: /tools/io-tinyfn-tinyfn/max-value.md
What max_value does on TinyFn
AI agents call max_value 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 |
|---|---|---|---|
numbers | string | Yes | Comma-separated numbers |
Parameters from the server's own tool schema.
Why max_value is rated Low
This is a simple computational function that queries or processes input data to return a result. It has no capacity to modify state, execute external operations, or cause irreversible changes. It belongs in the Read category as a low-severity tool with minimal security risk even if misused by an agent.
From the tool's definition Tool name 'max_value' and description 'Find maximum value' indicate a data retrieval/computation operation with no side effects.
Attacks that exploit this kind of access
The rule that runs max_value 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 max_value, this is the rule to start with:
max_value 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 max_value call is checked against it from then on.
Questions about max_value
Find maximum value. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
max_value accepts 1 parameter: numbers. Required: numbers. 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 max_value: 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.
max_value 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 max_value 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 max_value. 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.
max_value 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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