privilege_update
Update an existing privilege/role by its ID. Use privilege_list to find the ID. All fields are optional.
This record as markdown: /tools/nasbridge/privilege-update.md
What privilege_update does on Nasbridge
AI agents use privilege_update to create or update resources in Nasbridge, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Nasbridge environment.
Why privilege_update is rated Medium
This tool modifies (but does not irreversibly delete) privilege/role definitions in a TrueNAS system. Updating privileges affects access control policies and can grant or restrict permissions for users and roles. While reversible (Write category), the severity is high because misconfiguration of privilege/roles could grant unintended elevated access or lock out legitimate users.
From the tool's definition Tool name 'privilege_update' combined with description stating it 'Update[s] an existing privilege/role by its ID.' The action modifies system access controls and permissions which are critical security configurations.
Attacks that exploit this kind of access
The rule that runs privilege_update safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Nasbridge, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For privilege_update, this is the rule to start with:
privilege_update 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Nasbridge, apply this rule, and every privilege_update call is checked against it from then on.
Questions about privilege_update
Update an existing privilege/role by its ID. Use privilege_list to find the ID. All fields are optional. It is categorised as a Write tool in the Nasbridge MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Nasbridge MCP server in PolicyLayer and add a rule for privilege_update: 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 Nasbridge. Nothing to install.
privilege_update 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 privilege_update 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 privilege_update. 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.
privilege_update is provided by the Nasbridge MCP server (maverick0628/nasbridge). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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