AI agents call user_agent 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 |
|---|---|---|---|
ua | string | Yes | User agent string to parse |
Parameters from the server's own tool schema.
This tool performs string parsing and analysis only—a deterministic read operation that extracts information from user agent headers without side effects. No data is modified, code is executed, or external systems are invoked. It fits the 'Read' category as a retrieval/query operation with minimal security risk.
From the tool's definition Tool name 'user_agent' and description 'Parse a user agent string' indicate it retrieves and analyzes existing data without modification, creation, or execution of external operations.
Attacks that exploit this kind of access
Parse a user agent string. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
user_agent accepts 1 parameter: ua. Required: ua. 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 user_agent: 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.
user_agent 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 user_agent 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 user_agent. 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.
user_agent 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.
user_agent 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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