io.github.KoyoYeager/pystub
pystub
Is the io.github.KoyoYeager/pystub MCP server down? No. Installed with mcp<2, it started and listed its tools on 2026-10-31.
Auto-detect stubbable packages for Python exe builds and generate minimal stub code
needs mcp<2 probed 2026-11-14 · unchanged since 2026-10-31
A plain install of the package stops at the import below. These tool definitions are from a second install with mcp<2, started in a container with the network off, on 2026-10-31.
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 --with 'mcp<2' mcp-pystub@0.1.1 (stdio, probed in a container with the network off)
- Host
- pypi.org
- Reports itself as
- pystub 1.30.0
- Capabilities
- experimental, prompts, resources, tools
- Repository
- https://github.com/KoyoYeager/mcp-pystub
- Registry
- active, updated 2026-03-31 · registry entry
- Changes
- 2 recorded, reachable in 0 of them. A row is added when the result, the tool count or the cost changes.
Most expensive tools
Estimates with the o200k_base tokenizer.
| Tool | o200k estimate | Share of this server |
|---|---|---|
| analyze | 305 | 27 % |
| generate | 298 | 27 % |
| check | 272 | 25 % |
| graph | 235 | 21 % |
Compare this server with others.
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History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-31 07:36 | needs mcp<2 | 1.6 s | 4 | 1.6k | 1.1k |
| 2026-10-17 06:16 | crashed on start |
Badge for the README
The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.
A mail when this server changes
Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.
For the publisher
- The package imports FastMCP from mcp.server.fastmcp. mcp 2.0, the Python SDK of 28 July 2026, renamed FastMCP to MCPServer, and the package asks for mcp with no upper bound, so a plain install (uvx, pip) gets mcp 2.x and the server stops at the import. Installed with mcp<2, it starts and lists its tools. The fix for the publisher: pin mcp<2 in the dependencies, for example mcp>=1.2,<2, and publish a new version, or move to MCPServer as the SDK's migration guide says. Until then, run it with uvx --with 'mcp<2'.
The cause and the fix, with the code before and after: ModuleNotFoundError: No module named 'mcp.server.fastmcp'