insert_text · Lightrag MCP: Risk & Policy

WHAT IT DOES

What insert_text does on Lightrag

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

WHY IT NEEDS A POLICY

Why insert_text needs a policy

This tool creates or modifies data by inserting text content into the system. It is reversible (can be overwritten or deleted via other tools like delete_document), making it a Write operation rather than Execute or Destructive.

From the tool's definition Tool name 'insert_text' and description 'Add text content to LightRAG with a specified filename' indicate creating/adding new data to the system without deletion capability.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

insert_text Rate-limited

insert_text 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": {
    "insert_text": {
      "limits": [
        {
          "counter": "insert_text_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 Lightrag, so you can run agents against it safely.

FAQ

Questions about insert_text

What does the insert_text tool do? +

Add text content to LightRAG with a specified filename. It is categorised as a Write tool in the Lightrag MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on insert_text? +

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

What risk level is insert_text? +

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

Can I rate-limit insert_text? +

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

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

insert_text is provided by the Lightrag MCP server (lightrag-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.