AI agents call CancelAHORunBatch to permanently remove resources in AWS Step Functions Tool MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
The name strongly implies cancelling a batch of running executions in AWS Step Functions. Cancellation of running state machine executions is typically irreversible — once cancelled, those runs cannot be resumed. The blast radius is high because it targets a batch of executions simultaneously. However, the description is empty, which lowers confidence; it's possible 'Cancel' here means something less severe.
From the tool's definition Tool name 'CancelAHORunBatch' — 'Cancel' suggests stopping/terminating batch runs; 'Batch' implies multiple items affected at once
Documented attack patterns abuse exactly the kind of access CancelAHORunBatch gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and AWS Step Functions Tool MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for CancelAHORunBatch:
{
"version": "1",
"default": "deny",
"hide": [
"CancelAHORunBatch"
]
}CancelAHORunBatch disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
Free to start. No card required.
CancelAHORunBatch. It is categorised as a Destructive tool in the AWS Step Functions Tool MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the AWS Step Functions Tool MCP Server MCP server in PolicyLayer and add a rule for CancelAHORunBatch: 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 AWS Step Functions Tool MCP Server. Nothing to install.
CancelAHORunBatch 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 CancelAHORunBatch 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 CancelAHORunBatch. 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.
CancelAHORunBatch is provided by the AWS Step Functions Tool MCP Server MCP server (awslabs.stepfunctions-tool-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from AWS Step Functions Tool MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
805 AWS Step Functions Tool MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.