create_or_open_memory · Memvid MCP: Risk & Policy

WHAT IT DOES

What create_or_open_memory does on Memvid

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

WHY IT NEEDS A POLICY

Why create_or_open_memory needs a policy

This tool creates new memory files or modifies existing ones (reversible operations). It does not delete data (unlike memvid_delete_project), execute arbitrary code, or move money. The ability to initialize/open files represents a Write operation with medium severity due to potential for creating unwanted project context that could mislead downstream operations.

From the tool's definition Tool name 'create_or_open_memory' and description 'Initialize or open a Memvid memory file for a specific project' indicate file creation or modification. Context from sibling tool 'memvid_delete_project' suggests persistent data storage.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_or_open_memory Rate-limited

create_or_open_memory 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_or_open_memory": {
      "limits": [
        {
          "counter": "create_or_open_memory_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 Memvid, so you can run agents against it safely.

FAQ

Questions about create_or_open_memory

What does the create_or_open_memory tool do? +

Initialize or open a Memvid memory file for a specific project. It is categorised as a Write tool in the Memvid 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_or_open_memory? +

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

What risk level is create_or_open_memory? +

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

Can I rate-limit create_or_open_memory? +

Yes. Add a rate_limit block to the create_or_open_memory 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_or_open_memory completely? +

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

create_or_open_memory is provided by the Memvid MCP server (memvid-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.