ipynb_search_cells
AI agents call ipynb_search_cells to retrieve information from Jupyter Editor without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Based on the tool name and the context of sibling read-only tools in the notebook-editing suite, ipynb_search_cells most likely searches or queries cell content without modifying state. The empty description lowers confidence slightly, but the consistent naming pattern with other non-destructive tools on the server supports the Read classification.
From the tool's definition Tool name 'ipynb_search_cells' implies searching/querying notebook cells for patterns or content. No description provided, but naming convention and sibling tools (ipynb_get_cell, ipynb_filter_cells, ipynb_extract_cells) all operate in read-only query mode.
Attacks that exploit this kind of access
ipynb_search_cells. It is categorised as a Read tool in the Jupyter Editor MCP Server, which means it retrieves data without modifying state.
Register the Jupyter Editor MCP server in PolicyLayer and add a rule for ipynb_search_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 Jupyter Editor. Nothing to install.
ipynb_search_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 ipynb_search_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 ipynb_search_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.
ipynb_search_cells is provided by the Jupyter Editor MCP server (jsamuel1/jupyter-editor-mcp). 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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