index-upsert · MCP Index Notes MCP: Risk & Policy

WHAT IT DOES

What index-upsert does on MCP Index Notes

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

WHY IT NEEDS A POLICY

Why index-upsert needs a policy

index-upsert performs create and update operations on notes stored in the SQLite-backed index. These are Write-category actions because they are reversible (notes can be edited again or deleted). The severity is medium because uncontrolled writes could introduce incorrect data, pollution of the knowledge graph, or storage exhaustion, but the effects remain reversible.

From the tool's definition Tool description states 'Create or update a note' — these are reversible write operations that modify data in the note index.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

index-upsert Rate-limited

index-upsert 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": {
    "index-upsert": {
      "limits": [
        {
          "counter": "index-upsert_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 MCP Index Notes, so you can run agents against it safely.

FAQ

Questions about index-upsert

What does the index-upsert tool do? +

Create or update a note under a key. Returns the note id. It is categorised as a Write tool in the MCP Index Notes MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on index-upsert? +

Register the MCP Index Notes MCP server in PolicyLayer and add a rule for index-upsert: 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 MCP Index Notes. Nothing to install.

What risk level is index-upsert? +

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

Can I rate-limit index-upsert? +

Yes. Add a rate_limit block to the index-upsert 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 index-upsert completely? +

Set action: deny in the PolicyLayer policy for index-upsert. 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 index-upsert? +

index-upsert is provided by the MCP Index Notes MCP server (vjsr007/mcp-index-notes). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.