modal_list_volumes
AI agents call modal_list_volumes to retrieve information from Modal MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool lists volumes in a Modal environment. Listing operations are non-destructive queries that retrieve information without side effects. The read-only nature of the server and the absence of mutation capability confirm this is a Read-category tool. Severity is low because querying volume metadata poses minimal risk—it cannot modify, delete, or access sensitive data within volumes, only enumerate them.
From the tool's definition Tool name 'modal_list_volumes' indicates a list/query operation. Server description explicitly states it is 'read-only' and 'enables agents to inspect Modal apps, deployments, logs, containers, volumes, and sandboxes without granting mutation tools.' The…
Attacks that exploit this kind of access
modal_list_volumes. It is categorised as a Read tool in the Modal MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Modal MCP Server MCP server in PolicyLayer and add a rule for modal_list_volumes: 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 Modal MCP Server. Nothing to install.
modal_list_volumes 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 modal_list_volumes 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 modal_list_volumes. 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.
modal_list_volumes is provided by the Modal MCP Server MCP server (php-workx/modal-mcp). 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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