bulk_update · Mementos MCP: Risk & Policy

WHAT IT DOES

What bulk_update does on Mementos

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

WHY IT NEEDS A POLICY

Why bulk_update needs a policy

This tool creates or modifies data reversibly within the memory/entity system. It does not delete data (which would be Destructive), execute arbitrary code (Execute), or involve financial transactions (Financial).

From the tool's definition Tool name is 'bulk_update' and description states 'Update multiple memories with the same changes' — explicitly modifies data in the memory system.

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bulk_update Rate-limited

bulk_update 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": {
    "bulk_update": {
      "limits": [
        {
          "counter": "bulk_update_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 Mementos, so you can run agents against it safely.

FAQ

Questions about bulk_update

What does the bulk_update tool do? +

Update multiple memories with the same changes. It is categorised as a Write tool in the Mementos MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on bulk_update? +

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

What risk level is bulk_update? +

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

Can I rate-limit bulk_update? +

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

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

bulk_update is provided by the Mementos MCP server (@hasna/mementos). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.