ipynb_filter_cells
AI agents call ipynb_filter_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.
The name 'filter_cells' implies querying or selecting cells without modifying them. The tool is part of a notebook editing MCP server that offers both read operations (get_cell, extract_cells, get_metadata) and write operations (append_cell, insert_cell, delete_cell). 'Filter' typically denotes a non-destructive selection operation.
From the tool's definition Tool name 'ipynb_filter_cells' suggests selecting or querying cells from a notebook based on criteria. No description provided, but naming convention and context among sibling tools (ipynb_get_cell, ipynb_extract_cells) indicate a retrieval operation.
Attacks that exploit this kind of access
ipynb_filter_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_filter_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_filter_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_filter_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_filter_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_filter_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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