io.github.cunjun/mcubuddy
McuBuddy
Is the McuBuddy MCP server down? No. Installed with mcp<2, it started and listed its tools on 2026-11-01.
AI-native MCU debugging and observability through probes, symbols, RTOS, logs, and build tools.
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' McuBuddy@0.5.1 (stdio, probed in a container with the network off)
- Host
- pypi.org
- Reports itself as
- McuBuddy 1.30.0
- Capabilities
- experimental, prompts, resources, tools
- Repository
- https://github.com/cunjun/McuBuddy
- Registry
- active, updated 2026-07-20 · 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 |
|---|---|---|
| configure_probe | 275 | 2 % |
| start_gdb_server | 265 | 2 % |
| dump_memory | 254 | 2 % |
| memory_find | 253 | 2 % |
| start_jlink_gdb_server | 233 | 2 % |
Compare this server with others.
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Other registry entries on pypi.org, the ones next to this name; all of them.
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- Swiss Weather io.github.cuolm/swiss-weather-mcp · alive
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- io.github.cyberpapiii/imessage-max · install failed
- Cairn io.github.cybort360/cairn-mcp · needs mcp<2
Servers that mention observability or debugging.
- AnomalyArmor ai.anomalyarmor/armor-mcp · needs auth
- ai.diezx/diezx · no DNS
- ai.getvda/llm-observability-orchestration · newer protocol
- ai.getvda/llm-observability-orchestration-agent-langchain · newer protocol
- ai.getvda/llm-observability-orchestration-agent-langchain-community · newer protocol
- ai.getvda/llm-orchestration-observability-agent · newer protocol
- ai.noveum/noveum · needs auth
- Mengi Cloud cloud.mengi/mengi-cloud · needs auth
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 | 2.4 s | 104 | 22k | 12k |
| 2026-10-18 06:46 | 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'