convert_cell_type · MCP Jupyter Complete MCP: Risk & Policy

WHAT IT DOES

What convert_cell_type does on MCP Jupyter Complete

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

WHY IT NEEDS A POLICY

Why convert_cell_type needs a policy

Converting cell types is a Write operation because it modifies notebook cell metadata and structure. While reversible (a cell can be converted back), it can alter how content is interpreted (e.g., code to markdown), potentially affecting notebook execution behavior. The severity is medium because the change is reversible and affects only notebook structure without data loss or execution of arbitrary code.

From the tool's definition Tool description explicitly states 'Convert a cell from one type to another,' which modifies cell properties.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

convert_cell_type Rate-limited

convert_cell_type 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": {
    "convert_cell_type": {
      "limits": [
        {
          "counter": "convert_cell_type_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 Jupyter Complete, so you can run agents against it safely.

FAQ

Questions about convert_cell_type

What does the convert_cell_type tool do? +

Convert a cell from one type to another. It is categorised as a Write tool in the MCP Jupyter Complete MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on convert_cell_type? +

Register the MCP Jupyter Complete MCP server in PolicyLayer and add a rule for convert_cell_type: 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 Jupyter Complete. Nothing to install.

What risk level is convert_cell_type? +

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

Can I rate-limit convert_cell_type? +

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

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

convert_cell_type is provided by the MCP Jupyter Complete MCP server (tofunori/mcp-jupyter-complete). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.