cancel-flow-run

THE RISK

High Risk

Why cancel-flow-run needs a policy

Cancelling a flow run terminates an active process mid-execution. While it doesn't delete data, it interrupts an external operation (a running flow) whose effects depend on the specific flow being cancelled. This is an irreversible interruption of an ongoing operation — once cancelled, the flow run cannot be resumed.

From the tool's definition Cancel a running or waiting flow run

Documented attack patterns abuse exactly the kind of access cancel-flow-run gives an agent:

POLICY

How to control cancel-flow-run

PolicyLayer is an MCP gateway — it sits between your AI agents and PowerPlatform MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for cancel-flow-run:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "cancel-flow-run": {
      "limits": [
        {
          "counter": "cancel-flow-run_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

cancel-flow-run stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register PowerPlatform MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 66 PowerPlatform MCP tools →

Execute tools on other servers

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Go deeper

High-risk tools in PowerPlatform MCP → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about cancel-flow-run

What does the cancel-flow-run tool do? +

Cancel a running or waiting flow run. Cannot cancel flows already in a terminal state (Succeeded, Failed, Cancelled). It is categorised as a Execute tool in the PowerPlatform MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on cancel-flow-run? +

Register the PowerPlatform MCP server in PolicyLayer and add a rule for cancel-flow-run: 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 PowerPlatform MCP. Nothing to install.

What risk level is cancel-flow-run? +

cancel-flow-run is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit cancel-flow-run? +

Yes. Add a rate_limit block to the cancel-flow-run 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.

How do I block cancel-flow-run completely? +

Set action: deny in the PolicyLayer policy for cancel-flow-run. 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.

What MCP server provides cancel-flow-run? +

cancel-flow-run is provided by the PowerPlatform MCP server (michsob/powerplatform-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every PowerPlatform MCP tool call.

Start from PowerPlatform MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →