AI agents call preview_partial_install as a supporting operation in Fortimanager workflows.
The description is empty, so classification is based solely on the name. 'Preview' suggests a read-only operation that shows what a partial install would do without executing it, placing it in the Read category. However, given the context of sibling tools like 'abort_policy_install' which suggest execution of installs, and 'partial install' could involve execution, there is ambiguity.
From the tool's definition Tool name: preview_partial_install; description is empty and uninformative.
Documented attack patterns abuse exactly the kind of access preview_partial_install 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 preview_partial_install:
{
"version": "1",
"default": "deny",
"tools": {
"preview_partial_install": {
"limits": [
{
"counter": "preview_partial_install_rate",
"window": "minute",
"max": 60,
"scope": "grant"
}
]
}
}
}preview_partial_install gets a rate cap, and everything else on the server is denied unless you say otherwise.
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preview_partial_install. It is categorised as a Other tool in the Fortimanager MCP Server, which means it performs auxiliary operations.
Register the Fortimanager MCP server in PolicyLayer and add a rule for preview_partial_install: 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.
preview_partial_install is a Other tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the preview_partial_install 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 preview_partial_install. 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.
preview_partial_install 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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