Set the active agent and room for communication
AI agents use set_agent to create or update resources in Society ElizaOS Connector MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Society ElizaOS Connector MCP environment.
The tool changes application state (active agent/room selection) but does not execute code, delete data, or move money. This is a Write operation because it modifies settings reversibly. Severity is medium because misconfiguration could route subsequent chat_with_agent calls to unintended agents, potentially exposing sensitive conversations or causing confusion, but the change itself is easily reversible.
From the tool's definition Tool description states 'Set the active agent and room for communication' — this modifies the state of which agent and room are active, a reversible configuration change.
Documented attack patterns abuse exactly the kind of access set_agent gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Society ElizaOS Connector MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for set_agent:
{
"version": "1",
"default": "deny",
"tools": {
"set_agent": {
"limits": [
{
"counter": "set_agent_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}set_agent 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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Set the active agent and room for communication. It is categorised as a Write tool in the Society ElizaOS Connector MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Society ElizaOS Connector MCP server in PolicyLayer and add a rule for set_agent: 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 Society ElizaOS Connector MCP. Nothing to install.
set_agent 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 set_agent 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 set_agent. 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.
set_agent is provided by the Society ElizaOS Connector MCP server (wearesociety/elizaos_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Society ElizaOS Connector MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
4 Society ElizaOS Connector MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.