This record as markdown: /tools/io-tinyfn-tinyfn/subtract-time-2.md
What subtract_time_2 does on TinyFn
AI agents call subtract_time_2 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 |
|---|---|---|---|
days | integer | — | Days to subtract |
hours | integer | — | Hours to subtract |
minutes | integer | — | Minutes to subtract |
seconds | integer | — | Seconds to subtract |
datetime_str | string | Yes | Datetime in ISO format |
Parameters from the server's own tool schema.
Why subtract_time_2 is rated Low
subtract_time_2 performs arithmetic on temporal values and returns a computed datetime. It retrieves or derives data with no side effects on any external system or data store. This is characteristic of Read category tools—purely informational operations. The 'deterministic' description and mathematical nature confirm the tool has no mutative or destructive impact.
From the tool's definition Tool description: 'Subtract time from a datetime.' This is a pure computation that takes a datetime and a time duration as inputs and returns a calculated result. No data is created, modified, deleted, or persisted.
Attacks that exploit this kind of access
The rule that runs subtract_time_2 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 subtract_time_2, this is the rule to start with:
subtract_time_2 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 subtract_time_2 call is checked against it from then on.
Questions about subtract_time_2
Subtract time from a datetime. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
subtract_time_2 accepts 5 parameters: days, hours, minutes, seconds, datetime_str. Required: datetime_str. 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 subtract_time_2: 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.
subtract_time_2 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 subtract_time_2 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 subtract_time_2. 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.
subtract_time_2 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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