Enable or disable a specific node9 approver channel in the global config (~/.node9/config.json).
AI agents use node9_approver_set to create or update resources in Node9-Proxy — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Node9-Proxy environment.
This is a Write operation because it modifies existing configuration state in a reversible manner. However, it rates 'high' severity due to its control over approval channels in what is described as a security governance layer ('Execution Security Layer' and 'Sudo governance'). Misuse could disable critical approval mechanisms, allowing unauthorized actions.
From the tool's definition The tool enables or disables 'a specific node9 approver channel in the global config'. This modifies the configuration file (~/.node9/config.json) by changing approver channel settings, which is reversible (can be re-enabled/disabled).
Documented attack patterns abuse exactly the kind of access node9_approver_set gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Node9-Proxy, and nothing reaches the server without passing your rules. This is the rule we recommend for node9_approver_set:
{
"version": "1",
"default": "deny",
"tools": {
"node9_approver_set": {
"limits": [
{
"counter": "node9_approver_set_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}node9_approver_set 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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Enable or disable a specific node9 approver channel in the global config (~/.node9/config.json). It is categorised as a Write tool in the Node9-Proxy MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Node9-Proxy MCP server in PolicyLayer and add a rule for node9_approver_set: 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 Node9-Proxy. Nothing to install.
node9_approver_set 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 node9_approver_set 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 node9_approver_set. 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.
node9_approver_set is provided by the Node9-Proxy MCP server (node9-ai/node9-proxy). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 16 Node9-Proxy tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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16 Node9-Proxy tools catalogued and risk-classified — across an index of 42,500+ MCP servers.