memvid_api_fetch · Memvid MCP: Risk & Policy

WHAT IT DOES

What memvid_api_fetch does on Memvid

AI agents use memvid_api_fetch 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 memvid_api_fetch needs a policy

This tool retrieves content from a URL and writes it into a memory file, creating a new frame. The primary effect is a Write operation (adding data to a .mv2 memory file). While it also fetches external content, the defining action is persisting that content into storage. Misuse could add malicious or unwanted content into the agent's memory, hence medium severity.

From the tool's definition Fetch content from a URL and add to memory

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

memvid_api_fetch Rate-limited

memvid_api_fetch 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": {
    "memvid_api_fetch": {
      "limits": [
        {
          "counter": "memvid_api_fetch_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 memvid_api_fetch

What does the memvid_api_fetch tool do? +

Fetch content from a URL and add to memory. Supports web pages, APIs, and document URLs. Args: file: Path to the .mv2 memory file url: URL to fetch content from title: Custom title for the fetched content (optional) Returns: JSON with fetch status and created frame ID. 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 memvid_api_fetch? +

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

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

Can I rate-limit memvid_api_fetch? +

Yes. Add a rate_limit block to the memvid_api_fetch 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_api_fetch completely? +

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

memvid_api_fetch 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.