The node's runtime launches a tools bundle as a process and speaks MCP over stdio to it, so a tool may be written in any language and the transport stays in the runtime (ADR 0039's refusal, kept). Each SDK is the loop and the tool type and nothing else: `@novox/mesh-sdk/stdio` (serveStdio, and serveRegisteredOverStdio for a bundle that already registers the in-process way), python/, go/, rust/ and c/ beside it, each with an example answering `greet` and the seat verb `node-lamp.on`. Skeletons, by the operator's direction: the bare minimum one bundle per language needs to be built and answer, proven here by each example answering tools/list and tools/call on stdio.
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mesh-sdk for Python
The skeleton (novox/hq ADR 0187): mesh_sdk.serve(name, tools) speaks MCP over stdio to the node's
tool runtime. A Tool is a name, a description, an argument schema and a function. A tool named
<seat>.<verb> is the seat's implementation. No dependencies beyond the standard library.
What it holds, under ADR 0039's test: the stdio loop and the tool type. Nothing else — no bus, no
client, nothing of any module's. Run ./example.py and type a tools/list request to see it answer.