archive_memories · Mnemosyne MCP: Risk & Policy

WHAT IT DOES

What archive_memories does on Mnemosyne MCP

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

WHY IT NEEDS A POLICY

Why archive_memories needs a policy

Without an explicit description, classification relies on the tool name and server context. 'Archive' suggests reversible data modification (Write category) rather than deletion (Destructive). The server's focus on knowledge graph management supports this.

From the tool's definition Tool name 'archive_memories' combined with sibling tools including 'create_graph', 'create_folder', 'create_wires', and 'delete' indicates this server performs graph management operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

archive_memories Rate-limited

archive_memories 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": {
    "archive_memories": {
      "limits": [
        {
          "counter": "archive_memories_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 Mnemosyne MCP, so you can run agents against it safely.

FAQ

Questions about archive_memories

What does the archive_memories tool do? +

archive_memories. It is categorised as a Write tool in the Mnemosyne 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 archive_memories? +

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

What risk level is archive_memories? +

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

Can I rate-limit archive_memories? +

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

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

archive_memories is provided by the Mnemosyne MCP server (sophia-labs/mnemosyne-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.