memvid_session · Memvid MCP: Risk & Policy

WHAT IT DOES

What memvid_session does on Memvid

AI agents invoke memvid_session to trigger actions in Memvid. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why memvid_session needs a policy

Session management involves triggering stateful operations: starting a new session, stopping an active one, or replaying a recorded session. These actions have side effects that go beyond simple reads, as they initiate or terminate tracked agent interactions. 'Replay' in particular re-executes a prior session, which could have downstream effects.

From the tool's definition 'start', 'stop', or 'replay sessions' — triggers external operations (starting/stopping/replaying agent interaction sessions)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

memvid_session Rate-limited

memvid_session stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "memvid_session": {
      "limits": [
        {
          "counter": "memvid_session_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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 memvid_session

What does the memvid_session tool do? +

Session management - list, start, stop, or replay sessions. Sessions track agent interactions for replay and analysis. Args: file: Path to the .mv2 memory file list: List all recorded sessions start: Start a new session with this name stop: Stop the current active session replay: Replay a session by ID Returns: Session information or operation status. It is categorised as a Execute tool in the Memvid MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on memvid_session? +

Register the Memvid MCP server in PolicyLayer and add a rule for memvid_session: 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 memvid_session? +

memvid_session is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit memvid_session? +

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

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

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