Marks the task as cancelled. If the task is already in a terminal state (complete, failed, expired), returns 409 Conflict. Only the identity that created the task may cancel it. Use this tool when: - You submitted a probe with ?async=true and no longer need the result. - You want to free up a pen...
Part of the TunnelMind Data API server.
Free to start. No card required.
AI agents may call cancel_task to permanently remove or destroy resources in TunnelMind Data API. Without a policy, an autonomous agent could delete critical data in a loop with no way to undo the damage. PolicyLayer blocks destructive tools by default and requires explicit human approval before enabling them.
Without a policy, an AI agent could call cancel_task in a loop, permanently destroying resources in TunnelMind Data API. There is no undo for destructive operations. PolicyLayer blocks this tool by default and only allows it when a human explicitly approves the action.
Destructive tools permanently remove data. Block by default. Only enable with explicit approval workflows.
{
"version": "1",
"default": "deny",
"hide": [
"cancel_task"
]
}See the full TunnelMind Data API policy for all 54 tools.
These attack patterns abuse exactly the kind of access cancel_task gives an agent. Each links to the full case and the policy that stops it:
Other destructive tools across the catalogue. The same approach applies to each: deny by default, or require human approval.
Marks the task as cancelled. If the task is already in a terminal state (complete, failed, expired), returns 409 Conflict. Only the identity that created the task may cancel it. Use this tool when: - You submitted a probe with ?async=true and no longer need the result. - You want to free up a pending task before it expires. Do NOT use this tool when: - The task is already complete — cancellation is not possible. Inputs: - task_id (path, required): 26-char ULID. Returns: - task_id and status: cancelled. Cost: - Free. Latency: - Typical: <150ms.. It is categorised as a Destructive tool in the TunnelMind Data API MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the TunnelMind Data API MCP server in PolicyLayer and add a rule for cancel_task: 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 TunnelMind Data API. Nothing to install.
cancel_task 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 cancel_task 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 cancel_task. 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.
cancel_task is provided by the TunnelMind Data API MCP server (https://mcp-data.tunnelmind.ai/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 54 TunnelMind Data API tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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