set_role

SERVERHermoso SOURCEhttps://app.hermoso.ai/mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade D, identity unverified Pull the record →

This record as markdown: /tools/hermoso/set-role.md

WHAT IT DOES

What set_role does on Hermoso

AI agents use set_role to create or update resources in Hermoso, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Hermoso environment.

RISK

Why set_role is rated Medium

This tool modifies workspace member roles and permissions, granting or restricting access to billing and admin functions. While reversible (a role can be changed back), it is a consequential write operation that affects access control and potentially financial visibility.

From the tool's definition The tool description states it 'Change[s] a workspace member's role — admin (full access incl. billing) or member (read-only on billing).' This modifies user permissions and access levels, which is a reversible change to workspace configuration.

Risk signalsAdmin/system-level operation

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_role safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Hermoso, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For set_role, this is the rule to start with:

set_role Rate-limited

set_role 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "set_role": {
      "limits": [
        {
          "counter": "set_role_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Hermoso, apply this rule, and every set_role call is checked against it from then on.

FAQ

Questions about set_role

What does the set_role tool do? +

Change a workspace member’s role — admin (full access incl. billing) or member (read-only on billing). A privilege change: confirm the exact person + new role with the user, then call with confirm:true. It is categorised as a Write tool in the Hermoso MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_role? +

Register the Hermoso MCP server in PolicyLayer and add a rule for set_role: 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 Hermoso. Nothing to install.

What risk level is set_role? +

set_role is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit set_role? +

Yes. Add a rate_limit block to the set_role 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.

How do I block set_role completely? +

Set action: deny in the PolicyLayer policy for set_role. 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.

What MCP server provides set_role? +

set_role is provided by the Hermoso MCP server (https://app.hermoso.ai/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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