upsert_documents · Zvec MCP: Risk & Policy

WHAT IT DOES

What upsert_documents does on Zvec

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

WHY IT NEEDS A POLICY

Why upsert_documents needs a policy

An AI agent can call upsert_documents faster than any human can review — one bad instruction and it creates or modifies resources in Zvec by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

upsert_documents Rate-limited

upsert_documents 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": {
    "upsert_documents": {
      "limits": [
        {
          "counter": "upsert_documents_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 Zvec, so you can run agents against it safely.

FAQ

Questions about upsert_documents

What does the upsert_documents tool do? +

upsert_documents. It is categorised as a Write tool in the Zvec MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on upsert_documents? +

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

What risk level is upsert_documents? +

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

Can I rate-limit upsert_documents? +

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

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

upsert_documents is provided by the Zvec MCP server (zvec-ai/zvec-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.