List all cells in a Jupyter notebook with their indices and types
AI agents call list_cells to retrieve information from MCP Jupyter Complete without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool purely queries and returns metadata about notebook cells (indices and types) without creating, modifying, executing, or deleting any cells or data. It has no side effects and falls squarely within the Read category with minimal blast radius if misused by an AI agent.
From the tool's definition Tool name 'list_cells' and description 'List all cells in a Jupyter notebook with their indices and types' indicate a retrieval operation with no modification of data.
Attacks that exploit this kind of access
List all cells in a Jupyter notebook with their indices and types. It is categorised as a Read tool in the MCP Jupyter Complete MCP Server, which means it retrieves data without modifying state.
Register the MCP Jupyter Complete MCP server in PolicyLayer and add a rule for list_cells: 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.
list_cells is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_cells 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.
Set action: deny in the PolicyLayer policy for list_cells. 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.
list_cells 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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