AI agents use insert_policy_block to create or update resources in Fortimanager — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Fortimanager environment.
The name 'insert_policy_block' implies creating or inserting a policy block into a firewall policy configuration, which is a Write operation. Given the FortiManager context (network security management), misuse could have high impact on network security posture. However, the empty description significantly lowers confidence.
From the tool's definition Tool name 'insert_policy_block' and sibling tools like 'add_policies_to_block', 'abort_policy_install' suggest firewall policy management operations on FortiManager
Documented attack patterns abuse exactly the kind of access insert_policy_block 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 insert_policy_block:
{
"version": "1",
"default": "deny",
"tools": {
"insert_policy_block": {
"limits": [
{
"counter": "insert_policy_block_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}insert_policy_block 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.
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insert_policy_block. It is categorised as a Write tool in the Fortimanager MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Fortimanager MCP server in PolicyLayer and add a rule for insert_policy_block: 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.
insert_policy_block is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the insert_policy_block 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 insert_policy_block. 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.
insert_policy_block 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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