Confirmed by a file, or only reported Two columns. The left column lists eight claims a recorded capture file confirms: the sentinel inside and the real secret outside, default deny on example.com:443, a private Docker Engine 29.8.1 inside, commits fetched through the sandbox-m101-clone remote, the proxy at gateway.docker.internal:3128, MCP_GATEWAY_URL set inside the sandbox, docker-agent toolsets printing 27 types, and ai/qwen3:4b answering on Docker Model Runner with no provider key set. The right column lists six claims. Five are reported without a test: a MITM proxy that re-signs HTTPS, libkrun as the VMM, a start in tens of milliseconds, a verified kit signature, and sbx policy approval missing from the help although a 403 body names it. One rose box marks the disputed exfiltration path. CONFIRMED BY A CAPTURE FILE REPORTED, NOT TESTED HERE sentinel inside, real secret outside 10-env-sentinel.txt, 10-receiver.log default deny on example.com:443 09-blocked.txt, 09-check-verbose.json private Docker Engine 29.8.1 inside 04-guest.txt fetched via sandbox-m101-clone 08-clone-host.txt proxy gateway.docker.internal:3128 04-env.txt MCP_GATEWAY_URL set inside 11-static-inside.txt toolsets prints 27 types 16-toolsets.txt ai/qwen3:4b on DMR, no key set 25-doctor.txt, 27-inside-run.txt HTTPS re-signed by a MITM proxy issue #12, not checked the VMM is libkrun talk 2026-01-14, unverified a start in tens of milliseconds talk 2026-02-10, K35 not run a kit signature verifies sbx kit sign, not recorded sbx policy approval is not a command 403 body names it, never run allowed host as exfiltration path HN 2026-08-10, both sides printed