memento_remember · Memento MCP: Risk & Policy

WHAT IT DOES

What memento_remember does on Memento

AI agents use memento_remember 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_remember needs a policy

The tool performs memory operations that create, consolidate, and modify data in Memento's persistent storage. While some actions (evaluate, hit) may be read-only or have minimal side effects, the core capabilities include 'add' and 'consolidate' which are reversible data modifications.

From the tool's definition Tool description lists 'add, consolidate, share, evaluate, hit' actions on memory. 'Add' and 'consolidate' are clearly write operations that create or modify persistent data in the SQLite temporal graph.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

memento_remember Rate-limited

memento_remember 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_remember": {
      "limits": [
        {
          "counter": "memento_remember_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_remember

What does the memento_remember tool do? +

Memory operations. Actions: add, consolidate, share, evaluate, hit. 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_remember? +

Register the Memento MCP server in PolicyLayer and add a rule for memento_remember: 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_remember? +

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

Can I rate-limit memento_remember? +

Yes. Add a rate_limit block to the memento_remember 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_remember completely? +

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

memento_remember 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.