memento_configure · Memento MCP: Risk & Policy

WHAT IT DOES

What memento_configure does on Memento

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

WHY IT NEEDS A POLICY

Why memento_configure needs a policy

This tool modifies system configuration including enforcement policies, coercion rules, and autonomy parameters. While it creates/updates configuration (Write category) rather than executing arbitrary code or deleting data, the high severity stems from the potential blast radius: misconfigured enforcement rules, coercion policies, or autonomy settings could cause an AI agent to operate outside intended constraints,…

From the tool's definition Tool name 'memento_configure' with description stating 'Configure Memento' and listing actions including 'enforcement', 'coercion', 'daemon', 'autonomy' indicates modification of system behavior, goal enforcement rules, and autonomous agent settings.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

memento_configure Rate-limited

memento_configure 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": {
    "memento_configure": {
      "limits": [
        {
          "counter": "memento_configure_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 Memento, so you can run agents against it safely.

FAQ

Questions about memento_configure

What does the memento_configure tool do? +

Configure Memento. Actions: enforcement, coercion, daemon, autonomy,. It is categorised as a Write tool in the Memento MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on memento_configure? +

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

What risk level is memento_configure? +

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

Can I rate-limit memento_configure? +

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

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

memento_configure is provided by the Memento MCP server (joyciakira/memento). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.