AI agents call listWorkspaces to retrieve information from Terraform Registry MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool appears to retrieve or enumerate workspace information from Terraform Registry without side effects. The description is empty, but the name and peer tools on a Terraform-focused server strongly indicate a read-only list operation. Even if it queries sensitive data, listing is non-destructive.
From the tool's definition Tool name 'listWorkspaces' and its placement among sibling tools (listDataSources, listOrganizations, listRuns) suggests it retrieves workspace metadata without modification. The 'list' prefix and context of a Registry MCP server indicate a query operation.
Documented attack patterns abuse exactly the kind of access listWorkspaces gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Terraform Registry MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for listWorkspaces:
{
"version": "1",
"default": "deny",
"tools": {
"listWorkspaces": {}
}
}listWorkspaces is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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listWorkspaces. It is categorised as a Read tool in the Terraform Registry MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Terraform Registry MCP Server MCP server in PolicyLayer and add a rule for listWorkspaces: 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 Terraform Registry MCP Server. Nothing to install.
listWorkspaces 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 listWorkspaces 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 listWorkspaces. 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.
listWorkspaces is provided by the Terraform Registry MCP Server MCP server (thrashr888/terraform-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 24 Terraform Registry MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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24 Terraform Registry MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.