set-active-app

THE RISK

Medium Risk

Why set-active-app needs a policy

This tool modifies workspace state by changing the active application context. While reversible and not destructive, it is a write operation that changes configuration. Severity is medium rather than high because the blast radius is limited to workspace configuration rather than data deletion or financial impact, though it could affect subsequent ID allocations if the wrong app becomes active.

From the tool's definition Tool name 'set-active-app' and description 'Set the active AL app in the workspace' indicate modification of workspace configuration state. This is a reversible change that affects which application is currently active.

Documented attack patterns abuse exactly the kind of access set-active-app gives an agent:

POLICY

How to control set-active-app

PolicyLayer is an MCP gateway — it sits between your AI agents and AL Object ID Ninja MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for set-active-app:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "set-active-app": {
      "limits": [
        {
          "counter": "set-active-app_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

set-active-app stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register AL Object ID Ninja 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.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More AL Object ID Ninja MCP Server tools

Execute start-polling Start the polling service for real-time updates Execute stop-polling Stop the polling service Write authorize-app Authorize an AL app with the backend Write reserve-id Reserve a specific ID for use Write reserve-range Reserve a range of IDs for future use Write sync-object-ids Sync consumed object IDs with the backend Write assign-ids Interactively assign object IDs with collision checking Write batch-assign Batch assign IDs for multiple object types

All 26 AL Object ID Ninja MCP Server tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about set-active-app

What does the set-active-app tool do? +

Set the active AL app in the workspace. It is categorised as a Write tool in the AL Object ID Ninja MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set-active-app? +

Register the AL Object ID Ninja MCP Server MCP server in PolicyLayer and add a rule for set-active-app: 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 AL Object ID Ninja MCP Server. Nothing to install.

What risk level is set-active-app? +

set-active-app is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit set-active-app? +

Yes. Add a rate_limit block to the set-active-app 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 set-active-app completely? +

Set action: deny in the PolicyLayer policy for set-active-app. 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 set-active-app? +

set-active-app is provided by the AL Object ID Ninja MCP Server MCP server (sshadows/al-objid-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every AL Object ID Ninja MCP Server tool call.

Start from AL Object ID Ninja 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 →