sentinel_exec · SentinelX Core MCP: Risk & Policy

WHAT IT DOES

What sentinel_exec does on SentinelX Core MCP

AI agents invoke sentinel_exec to trigger actions in SentinelX Core MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why sentinel_exec needs a policy

This tool directly executes commands with no constraints specified. Command execution is inherently dangerous as it can trigger any operation depending on the arguments provided—from reading sensitive data to modifying system state to launching attacks. The critical severity reflects the unrestricted blast radius: an AI agent could execute destructive, financial, or exfiltration operations.

From the tool's definition Tool name 'sentinel_exec' combined with description 'Execute a command through SentinelX (/exec)' explicitly indicates arbitrary command execution capability.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sentinel_exec Rate-limited

sentinel_exec 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.

View as policy code

policy.json

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

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches SentinelX Core MCP, so you can run agents against it safely.

FAQ

Questions about sentinel_exec

What does the sentinel_exec tool do? +

Execute a command through SentinelX (/exec). It is categorised as a Execute tool in the SentinelX Core 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 sentinel_exec? +

Register the SentinelX Core MCP server in PolicyLayer and add a rule for sentinel_exec: 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 SentinelX Core MCP. Nothing to install.

What risk level is sentinel_exec? +

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

Can I rate-limit sentinel_exec? +

Yes. Add a rate_limit block to the sentinel_exec 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 sentinel_exec completely? +

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

sentinel_exec is provided by the SentinelX Core MCP server (pensados/sentinelx-core-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.