Cancel a running background job and stop its underlying query execution.
AI agents call cancel_job to permanently remove resources in USQL MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Cancelling a running job and stopping its underlying query execution is an irreversible action — the job's progress is lost and cannot be resumed. This constitutes a destructive operation with potentially high blast radius if a long-running critical query or data migration job is terminated unexpectedly.
From the tool's definition Cancel a running background job and stop its underlying query execution
Attacks that exploit this kind of access
Cancel a running background job and stop its underlying query execution. It is categorised as a Destructive tool in the USQL MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the USQL MCP Server MCP server in PolicyLayer and add a rule for cancel_job: 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 USQL MCP Server. Nothing to install.
cancel_job 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_job 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_job. 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_job is provided by the USQL MCP Server MCP server (jvm/usql-mcp). 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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