AI agents call listFiles to retrieve information from SMART-E2B without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves file system metadata (directory listing) without creating, modifying, deleting, or executing any operations. It has no side effects and poses minimal risk even if misused by an agent, as it only exposes information about what files exist in the sandbox environment.
From the tool's definition Tool name 'listFiles' and description 'List files in a directory in the sandbox' indicate retrieval of directory contents with no modification or execution.
Attacks that exploit this kind of access
List files in a directory in the sandbox. It is categorised as a Read tool in the SMART-E2B MCP Server, which means it retrieves data without modifying state.
Register the SMART-E2B MCP server in PolicyLayer and add a rule for listFiles: 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 SMART-E2B. Nothing to install.
listFiles 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 listFiles 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 listFiles. 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.
listFiles is provided by the SMART-E2B MCP server (leghis/smart-e2b). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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