AI agents call contains 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 | The text to search in |
search | string | Yes | The text to search for |
case_sensitive | boolean | — | Case sensitive search |
Parameters from the server's own tool schema.
This is a deterministic utility function that queries/inspects text data without modifying, executing external operations, or altering state. It is a read-only operation, consistent with the server's purpose of providing utility tools for AI agents. The minimal blast radius (e.g., an agent could only be misled by false substring match results) justifies 'low' severity.
From the tool's definition Tool name 'contains' and description 'Check if text contains a substring' indicate a simple string search operation with no side effects.
Attacks that exploit this kind of access
Check if text contains a substring. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
contains accepts 3 parameters: text, search, case_sensitive. Required: text, search. 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 contains: 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.
contains 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 contains 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 contains. 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.
contains 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.
contains 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.
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