io.github.pachote/nira-repl

NIRA REPL MCP

Is the NIRA REPL MCP server down? Yes. It has given no valid answer since 2026-10-20: crashed on start.

Secure code execution sandbox for Claude — run Python, JavaScript, and shell commands

crashed on start down since 2026-10-20 · probed 2026-11-14 · unchanged since 2026-10-27

MCP error -32000: Connection closed
ModuleNotFoundError: No module named 'mcp.server.fastmcp'. This is mcp 2.x, where FastMCP was renamed to MCPServer (from mcp

Run it: uvx nira-repl@1.0.1 (stdio, probed in a container with the network off)
Host: pypi.org
Repository: https://github.com/pachote/nira-repl
Registry: active, updated 2026-05-28 · registry entry

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Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.

For the publisher

No valid answer since 2026-10-20, in every probe since then.
The package stops at the import of FastMCP from mcp.server.fastmcp. mcp 2.0, the Python SDK of 28 July 2026, renamed FastMCP to MCPServer, and a plain install gets mcp 2.x. Pin mcp<2 in the dependencies, or move to MCPServer as the SDK's migration guide says. The error output is above.

The cause and the fix, with the code before and after: ModuleNotFoundError: No module named 'mcp.server.fastmcp'