research_start · NotebookLM MCP Server MCP: Risk & Policy

WHAT IT DOES

What research_start does on NotebookLM MCP Server

AI agents invoke research_start to trigger actions in NotebookLM MCP Server. 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 research_start needs a policy

The tool triggers external operations (web searches or Google Drive queries) rather than simply retrieving pre-existing data. While not destructive or financial, it executes a task whose side effects and scope are argument-dependent, fitting the Execute category.

From the tool's definition Tool description states "Start a research task (web or Google Drive search)" — this initiates an external operation (web search or cloud file access) whose outcomes depend on the search query arguments provided.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

research_start Rate-limited

research_start 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": {
    "research_start": {
      "limits": [
        {
          "counter": "research_start_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 NotebookLM MCP Server, so you can run agents against it safely.

FAQ

Questions about research_start

What does the research_start tool do? +

Start a research task (web or Google Drive search). It is categorised as a Execute tool in the NotebookLM MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on research_start? +

Register the NotebookLM MCP Server MCP server in PolicyLayer and add a rule for research_start: 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 NotebookLM MCP Server. Nothing to install.

What risk level is research_start? +

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

Can I rate-limit research_start? +

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

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

research_start is provided by the NotebookLM MCP Server MCP server (pavelguzenfeld/notebooklm-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.