This record as markdown: /tools/io-tinyfn-tinyfn/extract-numbers.md
What extract_numbers does on TinyFn
AI agents call extract_numbers 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 extract from |
Parameters from the server's own tool schema.
Why extract_numbers is rated Low
This tool retrieves numeric values from input text without modifying, deleting, or executing anything. It is a pure read operation with minimal security impact—worst case, it provides information extraction that could be used for downstream purposes, but the tool itself causes no harm. Severity is low because misuse poses no blast radius.
From the tool's definition Tool name 'extract_numbers' and description 'Extract all numbers from text' indicate a retrieval/parsing operation with no side effects.
Attacks that exploit this kind of access
The rule that runs extract_numbers 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 extract_numbers, this is the rule to start with:
extract_numbers 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 extract_numbers call is checked against it from then on.
Questions about extract_numbers
Extract all numbers from text. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
extract_numbers 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 extract_numbers: 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.
extract_numbers 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 extract_numbers 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 extract_numbers. 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.
extract_numbers 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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