Scan a remote host for its SSH host key
AI agents call keychaincredential_remote_ssh_scan to retrieve information from Truenas without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs network discovery and retrieval of public SSH host keys, which is a non-destructive query operation. While it touches external systems, the action is informational only and does not execute code, modify data, or cause side effects on the target or the TrueNAS system itself.
From the tool's definition Tool name includes 'scan' and description states 'Scan a remote host for its SSH host key' — this is a read-only operation that queries and retrieves the SSH host key from a remote system without modifying or deleting anything.
Documented attack patterns abuse exactly the kind of access keychaincredential_remote_ssh_scan gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Truenas, and nothing reaches the server without passing your rules. This is the rule we recommend for keychaincredential_remote_ssh_scan:
{
"version": "1",
"default": "deny",
"tools": {
"keychaincredential_remote_ssh_scan": {}
}
}keychaincredential_remote_ssh_scan is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Scan a remote host for its SSH host key. It is categorised as a Read tool in the Truenas MCP Server, which means it retrieves data without modifying state.
Register the Truenas MCP server in PolicyLayer and add a rule for keychaincredential_remote_ssh_scan: 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 Truenas. Nothing to install.
keychaincredential_remote_ssh_scan is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the keychaincredential_remote_ssh_scan 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 keychaincredential_remote_ssh_scan. 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.
keychaincredential_remote_ssh_scan is provided by the Truenas MCP server (spranab/truenas-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Truenas, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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279 Truenas tools catalogued and risk-classified — across an index of 43,000+ MCP servers.