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rcon func on the instance command channel: WebSocket JSON WebRCON with Identifier correlation (skips chat/log noise frames) and full Valve Source RCON over TCP (auth, exec, multi-packet reassembly via empty probe, 1MiB cap). Protocol inferred from game, explicit kind override in [instance.rcon]. Always 127.0.0.1 — agent is co-located. Hardening from review: WebRCON password never interpolated into error contexts/logs (redacted URL); probe-tolerant termination — a quiet period after received data ends the response for servers that don't echo the probe (Soulmask conformance unverified), so data is never discarded on probe timeout. 13/13 tests green incl. mock Source-RCON server (auth/multi-packet/ errors) and mock WebRCON server (noise-frame skipping). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>