Cancel a queued build by its queue item id.
AI agents call cancel_queue_item to permanently remove resources in Jenkins — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Cancelling a queued build is an irreversible action — once cancelled, that queue item is gone and the build will not run. It cannot be undone (the item cannot be re-queued automatically). This makes it Destructive rather than merely Write. Severity is medium because it affects CI/CD pipeline execution but does not delete code or data.
From the tool's definition Cancel a queued build by its queue item id
Attacks that exploit this kind of access
Cancel a queued build by its queue item id. It is categorised as a Destructive tool in the Jenkins MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Jenkins MCP server in PolicyLayer and add a rule for cancel_queue_item: 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 Jenkins. Nothing to install.
cancel_queue_item 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_queue_item 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_queue_item. 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_queue_item is provided by the Jenkins MCP server (lokimcpuniverse/jenkins-mcp-server). 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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