AI agents call test_pattern to retrieve information from TinyFn without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
text | string | Yes | Text to test against |
flags | string | — | Flags: i=ignore case, m=multiline, s=dotall |
pattern | string | Yes | Regular expression pattern |
Parameters from the server's own tool schema.
This tool performs pattern matching validation, which is a read-only operation that checks whether text conforms to a regex pattern. No data is created, modified, deleted, or external operations are triggered. The severity is low because even if misused, regex pattern testing cannot cause harm to systems, data, or financial assets.
From the tool's definition Tool name 'test_pattern' and description 'Test if a regex pattern matches text' indicate a query operation that tests/validates input against a pattern without modifying any data or executing external code.
Attacks that exploit this kind of access
Test if a regex pattern matches text. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
test_pattern accepts 3 parameters: text, flags, pattern. Required: text, pattern. 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 test_pattern: 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.
test_pattern 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 test_pattern 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 test_pattern. 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.
test_pattern 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.
test_pattern is one line of TinyFn's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
Teams ship this data inside their own products. See what a licence covers →