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Tag 6: the server relays an MCP exchange the container asked of the client’s servers, its params verbatim; the client answers with exactly one channel response, a result or an error, which the server relays to the container.

The server opens this channel when the container’s proxy opens the corresponding MCP channel on the begin scope. The params are relayed verbatim; the client’s one answer is relayed back.

• The request. The tag byte 6 followed by the params as JSON. Request states its form.
• The response. Exactly one channel response, a result or an MCP error, and the channel response finish. Response states the sequence.
• The conduit. The server relays the one channel response onto the proxy’s channel as one channel response and finishes it. The server does not read the params or the answer, and does not send the ask twice.