set_agent_role · Agent-Comm-Hub MCP: Risk & Policy

WHAT IT DOES

What set_agent_role does on Agent-Comm-Hub

AI agents use set_agent_role to create or update resources in Agent-Comm-Hub — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Agent-Comm-Hub environment.

WHY IT NEEDS A POLICY

Why set_agent_role needs a policy

This tool creates or modifies role assignments and permission structures reversibly. While it doesn't delete data (Destructive) or move money (Financial), it changes agent capabilities and organizational hierarchy. The high severity reflects that misconfigured roles could grant unintended administrative access or break task management chains across the communication infrastructure.

From the tool's definition Tool sets/modifies agent roles (admin/member/group_admin) with differential permission scoping. Description indicates role assignment capability with administrative gatekeeping ('仅 admin 可调用' = 'only admin can call').

Risk signalsAdmin/system-level operation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_agent_role Rate-limited

set_agent_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_agent_role": {
      "limits": [
        {
          "counter": "set_agent_role_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Agent-Comm-Hub, so you can run agents against it safely.

FAQ

Questions about set_agent_role

What does the set_agent_role tool do? +

设置 Agent 角色（admin/member/group_admin）。group_admin 需指定 managed_group_id，仅能管理该 parallel_group 内成员的任务。仅 admin 可调用。. It is categorised as a Write tool in the Agent-Comm-Hub 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_agent_role? +

Register the Agent-Comm-Hub MCP server in PolicyLayer and add a rule for set_agent_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 Agent-Comm-Hub. Nothing to install.

What risk level is set_agent_role? +

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

Can I rate-limit set_agent_role? +

Yes. Add a rate_limit block to the set_agent_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_agent_role completely? +

Set action: deny in the PolicyLayer policy for set_agent_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_agent_role? +

set_agent_role is provided by the Agent-Comm-Hub MCP server (liuboacean/agent-comm-hub). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.