create_session_rule

THE RISK

Medium Risk

Why create_session_rule needs a policy

This tool creates and persists new session rules, which are configuration objects that govern AI agent behavior within orchestrated sessions. While the action is reversible (rules can typically be deleted or modified), it modifies system state with potentially wide impact on conversation flow, context access, and agent constraints.

From the tool's definition Tool name 'create_session_rule' and description 'Create a new persistent session rule (stored in Memory MCP)' indicate irreversible data creation. The tool modifies session state by writing rules to persistent storage (Memory MCP).

Documented attack patterns abuse exactly the kind of access create_session_rule gives an agent:

POLICY

How to control create_session_rule

PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Conductor, and nothing reaches the server without passing your rules. This is the rule we recommend for create_session_rule:

policy.json

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

create_session_rule 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.

Create a free account and register MCP Conductor — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 25 MCP Conductor tools →

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about create_session_rule

What does the create_session_rule tool do? +

Create a new persistent session rule (stored in Memory MCP). It is categorised as a Write tool in the MCP Conductor MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_session_rule? +

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

What risk level is create_session_rule? +

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

Can I rate-limit create_session_rule? +

Yes. Add a rate_limit block to the create_session_rule 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 create_session_rule completely? +

Set action: deny in the PolicyLayer policy for create_session_rule. 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 create_session_rule? +

create_session_rule is provided by the MCP Conductor MCP server (lutherscottgarcia/mcp-conductor). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Conductor tool call.

Start from MCP Conductor, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →