AI agents invoke execute_device_json_commands to trigger actions in Fortimanager. 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.
This tool runs arbitrary JSON commands on FortiManager-managed devices. Even without a description, the name clearly signals code/command execution capability. In a network security context (FortiManager manages Fortinet firewalls and security devices), executing commands can modify firewall rules, routing, access controls, or disable security features. Misuse by an AI agent could compromise network security posture.
From the tool's definition Tool name 'execute_device_json_commands' explicitly indicates execution of commands on devices. The verb 'execute' combined with 'commands' shows this triggers external operations.
Documented attack patterns abuse exactly the kind of access execute_device_json_commands gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Fortimanager, and nothing reaches the server without passing your rules. This is the rule we recommend for execute_device_json_commands:
{
"version": "1",
"default": "deny",
"tools": {
"execute_device_json_commands": {
"limits": [
{
"counter": "execute_device_json_commands_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}execute_device_json_commands 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.
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execute_device_json_commands. It is categorised as a Execute tool in the Fortimanager MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Fortimanager MCP server in PolicyLayer and add a rule for execute_device_json_commands: 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 Fortimanager. Nothing to install.
execute_device_json_commands is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the execute_device_json_commands 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 execute_device_json_commands. 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.
execute_device_json_commands is provided by the Fortimanager MCP server (jmpijll/fortimanager-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Fortimanager, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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