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ipykernel-mcp

by 0x0L
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ipykernel-mcp

An MCP server that manages an IPython kernel, allowing LLMs to execute Python code in a project's virtual environment.

Built with FastMCP and jupyter-client.

Tools

Tool

Description

kernel_start(project_dir)

Start a kernel using the .venv from the given project directory

kernel_execute(code, timeout)

Execute code and return tagged output blocks ([stdout], [stderr], [result], [error], images). On timeout, returns partial output + [pending] with a msg_id

kernel_get_output(msg_id, timeout)

Retrieve remaining output for a timed-out execution. Auto-cleans up once complete

kernel_interrupt()

Send SIGINT to cancel a long-running execution without losing kernel state

kernel_restart()

Restart the kernel, clearing all variables and state

kernel_stop()

Stop the kernel and clean up resources

kernel_status()

Return kernel status: running, alive, project_dir, connection_file, pending_executions, ports

Related MCP server: venv-mcp-server

Installation

uv sync

The project directory passed to kernel_start must contain a .venv with ipykernel installed.

Usage

Run the MCP server:

ipykernel-mcp

Or add it to your MCP client configuration:

{
  "mcpServers": {
    "ipykernel-mcp": {
      "command": "uvx",
      "args": ["--from", "git+https://github.com/0x0L/ipykernel-mcp", "ipykernel-mcp"]
    }
  }
}

Monitoring

jupyter_watch can monitor kernel output (stdout, stderr, display data) in real-time in a browser:

npx github:0x0L/jupyter_watch <connection_file>

The connection file path is printed by kernel_start when the kernel starts.

Development

uv sync --dev
uv run pytest tests/ -v

Pre-commit hooks are configured to run formatting, linting, and type checking:

uv run pre-commit install
Install Server
A
license - permissive license
A
quality
D
maintenance

How are these scores calculated?

Maintenance

–Maintainers
–Response time
–Release cycle
–Releases (12mo)
Commit activity

Resources

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Tools

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