modal_list_app_deployments
AI agents call modal_list_app_deployments 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 Modal app deployments, which is a query operation that retrieves information without modifying state. The server is explicitly advertised as read-only, and the tool name pattern (list_*) combined with the read-only context indicates this is purely informational retrieval with no side effects.
From the tool's definition Tool name contains 'list' which indicates data retrieval. Server description explicitly states 'read-only' and 'without granting mutation tools'.
Attacks that exploit this kind of access
modal_list_app_deployments. 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_app_deployments: 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_app_deployments 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_app_deployments 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_app_deployments. 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_app_deployments 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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