Cancel one or more running tasks. Accepts a single task_id or an array. Running tasks are aborted and marked cancelled. Already-terminal tasks are listed under already_terminal; unknown IDs under not_found.
Part of the Mcp Codex Worker server.
Free to start. No card required.
AI agents may call cancel-task to permanently remove or destroy resources in Mcp Codex Worker. 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 Mcp Codex Worker. 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 Mcp Codex Worker policy for all 5 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.
Cancel one or more running tasks. Accepts a single task_id or an array. Running tasks are aborted and marked cancelled. Already-terminal tasks are listed under already_terminal; unknown IDs under not_found.. It is categorised as a Destructive tool in the Mcp Codex Worker MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Mcp Codex Worker 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 Mcp Codex Worker. 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 Mcp Codex Worker MCP server (mcp-codex-worker). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 5 Mcp Codex Worker tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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