modal_list_workspaces
AI agents call modal_list_workspaces 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.
The tool lists workspaces, a read-only query operation with no side effects. The server is explicitly designed as read-only for inspection purposes only. Even with empty description, the server context and naming pattern confirm this is a passive retrieval tool. Severity is low because listing workspaces discloses organizational structure but does not enable data modification or access to sensitive runtime data.
From the tool's definition Tool name 'modal_list_workspaces' with 'list' prefix indicates data retrieval. Server description explicitly states 'read-only Modal context' and 'inspect Modal apps, deployments, logs, containers, volumes, and sandboxes without granting mutation tools.'…
Attacks that exploit this kind of access
modal_list_workspaces. 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_workspaces: 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_workspaces 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_workspaces 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_workspaces. 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_workspaces 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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