update_chat_rule · RunWhen Platform MCP: Risk & Policy

WHAT IT DOES

What update_chat_rule does on RunWhen Platform MCP

AI agents use update_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 update_chat_rule needs a policy

This tool modifies chat rules, which are configuration settings governing workspace chat behavior and automation. While the modification is reversible (Write category, not Destructive), misconfiguration could affect chat behavior, access controls, or automation workflows across the workspace—hence medium severity. However, the tool description is empty, which reduces confidence.

From the tool's definition Tool name 'update_chat_rule' indicates modification of chat rules within the RunWhen Platform workspace. The 'update' verb signifies reversible data modification.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_chat_rule Rate-limited

update_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": {
    "update_chat_rule": {
      "limits": [
        {
          "counter": "update_chat_rule_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 RunWhen Platform MCP, so you can run agents against it safely.

FAQ

Questions about update_chat_rule

What does the update_chat_rule tool do? +

update_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 update_chat_rule? +

Register the RunWhen Platform MCP server in PolicyLayer and add a rule for update_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 update_chat_rule? +

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

Can I rate-limit update_chat_rule? +

Yes. Add a rate_limit block to the update_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 update_chat_rule completely? +

Set action: deny in the PolicyLayer policy for update_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 update_chat_rule? +

update_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.