AI agents call cancelRun to permanently remove resources in Terraform Registry MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Based on the tool name, 'cancelRun' likely cancels an in-progress Terraform run, which is an irreversible action that terminates an active operation. In context of sibling tools like 'applyRun' and 'createRun', canceling a run mid-execution could leave infrastructure in a partially applied state, which may be difficult or impossible to recover from cleanly.
From the tool's definition Tool name 'cancelRun' — description is empty and uninformative.
Documented attack patterns abuse exactly the kind of access cancelRun 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 cancelRun:
{
"version": "1",
"default": "deny",
"hide": [
"cancelRun"
]
}cancelRun disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
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cancelRun. It is categorised as a Destructive tool in the Terraform Registry MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Terraform Registry MCP Server MCP server in PolicyLayer and add a rule for cancelRun: 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.
cancelRun is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the cancelRun 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 cancelRun. 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.
cancelRun 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.