AI agents call empty_array 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.
This tool retrieves/returns a value (an empty array) without modifying, executing external operations, deleting, or creating data. It is a read-only operation with no side effects. Severity is low because misuse cannot cause harm—the output is deterministic and harmless regardless of context.
From the tool's definition Tool name 'empty_array' and description 'Returns an empty array.' indicate a simple data retrieval operation that returns a static, empty array with no side effects.
Attacks that exploit this kind of access
Returns an empty array. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
Register the TinyFn MCP server in PolicyLayer and add a rule for empty_array: 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.
empty_array 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 empty_array 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 empty_array. 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.
empty_array 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.
empty_array 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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