Stateless MCP server runs every tool in a fuel-metered WASM sandbox

MichaelS1011 · reddit · 2026-09-22

ephemora-cell-mcp 1.0.4 (Apache-2.0, on PyPI) is a fully stateless MCP server: each tool is a WASM module in a capability sandbox with fuel metering, no network, and output caps. No initialize handshake needed — requests stamped with the 2026-07-28 protocol version just work, so servers can be killed or load-balanced between calls, while legacy clients still work via handshake. Same calls consume identical fuel on different hosts (verified at 21,143 units), and get-policy reports each tool's sandbox policy from the same code path that enforces it.

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