AI agents call ssh_forward_list to retrieve information from Mcpx without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a passive information retrieval operation—it queries and returns the state of active SSH port forwards. There are no side effects, no data modifications, no command execution, and no irreversible actions.
From the tool's definition The tool name contains 'list' and the description explicitly states 'List active SSH port forwards', which indicates a read-only query operation that retrieves information about existing port forwards without modifying or executing anything.
Attacks that exploit this kind of access
List active SSH port forwards. It is categorised as a Read tool in the Mcpx MCP Server, which means it retrieves data without modifying state.
Register the Mcpx MCP server in PolicyLayer and add a rule for ssh_forward_list: 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 Mcpx. Nothing to install.
ssh_forward_list 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 ssh_forward_list 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 ssh_forward_list. 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.
ssh_forward_list is provided by the Mcpx MCP server (rmednitzer/relay-shell). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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