create_chat_rule · RunWhen Platform MCP: Risk & Policy

WHAT IT DOES

What create_chat_rule does on RunWhen Platform MCP

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

WHY IT NEEDS A POLICY

Why create_chat_rule needs a policy

The tool creates a new chat rule within the RunWhen workspace environment. This is a reversible write operation that modifies the configuration/state of the system by adding a new rule. While the exact implications of a chat rule are unclear due to the empty description, the 'create' operation pattern places this in the Write category.

From the tool's definition Tool name is 'create_chat_rule' which indicates creation of a new chat rule resource. The description is empty, limiting direct evidence of intent.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_chat_rule Rate-limited

create_chat_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.

View as policy code

policy.json

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

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Instant setup, no code required.

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

FAQ

Questions about create_chat_rule

What does the create_chat_rule tool do? +

create_chat_rule. It is categorised as a Write tool in the RunWhen Platform MCP 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_chat_rule? +

Register the RunWhen Platform MCP server in PolicyLayer and add a rule for create_chat_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 RunWhen Platform MCP. Nothing to install.

What risk level is create_chat_rule? +

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

Can I rate-limit create_chat_rule? +

Yes. Add a rate_limit block to the create_chat_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_chat_rule completely? +

Set action: deny in the PolicyLayer policy for create_chat_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_chat_rule? +

create_chat_rule is provided by the RunWhen Platform MCP server (runwhen-contrib/runwhen-platform-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.