io.github.tschoonj/xraylib-mcp-server
xraylib X-ray Interaction Data Server
Is the io.github.tschoonj/xraylib-mcp-server MCP server down? No. Installed with mcp<2, it started and listed its tools on 2026-11-06.
MCP server providing X-ray interaction data via xraylib
needs mcp<2 probed 2026-11-14 · unchanged since 2026-11-06
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 2026-11-06.
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' xraylib-mcp-server@0.1.6 (stdio, probed in a container with the network off)
- Host
- pypi.org
- Reports itself as
- xraylib X-ray Interaction Data Server 1.30.0
- Capabilities
- experimental, prompts, resources, tools
- Repository
- https://github.com/tschoonj/xraylib-mcp-server
- Registry
- active, updated 2026-04-14 · registry entry
- Changes
- 3 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 |
|---|---|---|
| DCSPb_Rayl_CP | 166 | 1 % |
| DCSP_Rayl_CP | 164 | 1 % |
| DCSPb_Compt_CP | 164 | 1 % |
| DCSP_Compt_CP | 162 | 1 % |
| CSb_FluorShell_Kissel_Nonradiative_Cascade | 159 | 1 % |
Compare this server with others.
More servers
Other registry entries on pypi.org, the ones next to this name; all of them.
- io.github.truecallerabreham/mcp-server-digitalocean · crashed on start
- vibatchium io.github.trueoriginlabs/vibatchium · alive
- io.github.trycoin-ai/agentrisk · needs args
- io.github.tschoonj/repology-mcp-server · needs mcp<2
- OpenRouter io.github.tsilva/mcp-openrouter · alive
- io.github.tspicer/amazon_ads_mcp · needs env
- io.github.tsutera09/tempo · alive
- buddie io.github.tsyyan/buddie · alive
Servers that mention interaction or providing.
- Aviado AI ai.aviado/health · alive
- ai.smithery/smithery-ai-slack · not found
- GoDavaii Health AI com.godavaii/health-ai · alive
- SharePointListsTools com.microsoft/workiq-sharepointliststools · needs your URL
- Tend com.tendladder/tend · TLS error
- World Airfares Flight Search com.worldairfares/flights-mcp · alive
- 60fps design.60fps/library · needs auth
- Svelte MCP dev.svelte/mcp · alive
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-11-06 08:42 | needs mcp<2 | 1.9 s | 106 | 22k | 12k |
| 2026-10-30 07:55 | crashed on start | ||||
| 2026-10-16 06:31 | install failed |
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'