cancel_processing

THE RISK

High Risk

Why cancel_processing needs a policy

This tool interrupts/terminates an active processing operation. It's an action that triggers an external operational effect (stopping a running process), which fits Execute. While it doesn't run code directly, it controls execution state.

From the tool's definition Cancel the currently running Metashape operation

Documented attack patterns abuse exactly the kind of access cancel_processing gives an agent:

POLICY

How to control cancel_processing

PolicyLayer is an MCP gateway — it sits between your AI agents and Metashape MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for cancel_processing:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "cancel_processing": {
      "limits": [
        {
          "counter": "cancel_processing_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

cancel_processing 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 Metashape MCP Server — 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

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All 112 Metashape MCP Server tools →

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Go deeper

High-risk tools in Metashape MCP Server → 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_processing

What does the cancel_processing tool do? +

Cancel the currently running Metashape operation. It is categorised as a Execute tool in the Metashape MCP Server 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_processing? +

Register the Metashape MCP Server MCP server in PolicyLayer and add a rule for cancel_processing: 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 Metashape MCP Server. Nothing to install.

What risk level is cancel_processing? +

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

Can I rate-limit cancel_processing? +

Yes. Add a rate_limit block to the cancel_processing 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_processing completely? +

Set action: deny in the PolicyLayer policy for cancel_processing. 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_processing? +

cancel_processing is provided by the Metashape MCP Server MCP server (jenkinsm13/metashape-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Metashape MCP Server tool call.

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

CHECK YOUR STACK →