list_sandboxes
AI agents call list_sandboxes to retrieve information from MCP4Modal Sandbox without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns a list of sandboxes without modifying, executing operations within, or deleting any resources. It is a simple enumeration/discovery operation typical of Read category tools. Even though the description is empty, the tool name provides sufficient clarity.
From the tool's definition Tool name 'list_sandboxes' indicates a query/enumeration operation that retrieves information about existing sandboxes. The 'list_' prefix is a strong signal for read-only retrieval with no side effects.
Attacks that exploit this kind of access
list_sandboxes. It is categorised as a Read tool in the MCP4Modal Sandbox MCP Server, which means it retrieves data without modifying state.
Register the MCP4Modal Sandbox MCP server in PolicyLayer and add a rule for list_sandboxes: 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 MCP4Modal Sandbox. Nothing to install.
list_sandboxes 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 list_sandboxes 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 list_sandboxes. 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.
list_sandboxes is provided by the MCP4Modal Sandbox MCP server (milkymap/mcp4modal_sandbox). 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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