io.github.DocMinus/decimer-mcp-server
DECIMER MCP Server
Is the DECIMER MCP server down? No. Installed with mcp<2, it started and listed its tools on 2026-11-01.
MCP server for DECIMER image-to-SMILES chemical structure recognition
needs mcp<2 probed 2026-11-14 · unchanged since 2026-11-01
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 2026-11-01.
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' decimer-mcp-server@0.1.4 (stdio, probed in a container with the network off)
- Host
- pypi.org
- Reports itself as
- decimer-mcp-server 1.30.0
- Capabilities
- experimental, prompts, resources, tools
- Repository
- https://github.com/DocMinus/DecimerMCPServer
- Registry
- active, updated 2026-04-13 · 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_chemical_image | 103 | 76 % |
| server_health | 33 | 24 % |
Compare this server with others.
More servers
Other registry entries on pypi.org, the ones next to this name; all of them.
- mcp-mexico io.github.DiegoTepichin/mcp-mexico · alive
- Signal Feed API: market regime io.github.DinevDecor/signal-feed-mcp · alive
- Trust Engine AI: model retirements and agent cost io.github.DinevDecor/trust-engine-mcp · alive
- ooxml-integrity io.github.Dmitry-Kov/ooxml-integrity · alive
- DocSlicer io.github.DocSlicer/docslicer · needs args
- PhotoS io.github.Dongwu259/photo-s · needs args
- io.github.Dudude-bit/yandex-lavka-mcp · alive
- TopicGate io.github.Dumdart/topicgate · needs env
Servers that mention recognition or structure.
- AkkruData ai.akkrudata/akkrudata · needs auth
- Axon NeuroAutomata ai.axonagentic/neuroautomata · needs auth
- BorealHost ai.borealhost/mcp · alive
- Cloud World Model ai.cloudworldmodel/cloud-world-model · alive
- Lenny Rachitsky Podcast Transcripts MCP Server ai.com.mcp/lenny-rachitsky-podcast · alive
- ColdState — Deterministic Knowledge Infrastructure ai.coldstate/knowledge · alive
- Data Center Index ai.datacenterindex/datacenterindex · needs auth
- DripMetrics ai.dripmetrics/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 |
|---|---|---|---|---|---|
| 2026-11-01 08:12 | needs mcp<2 | 1.2 s | 2 | 269 | 136 |
| 2026-10-18 06:39 | 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'