diff --git a/examples/acp-agent/tests/snapshots/missing-sandbox-runner/session.jsonl b/examples/acp-agent/tests/snapshots/missing-sandbox-runner/session.jsonl
index f9e30bb24d..de0171618e 100644
--- a/examples/acp-agent/tests/snapshots/missing-sandbox-runner/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/missing-sandbox-runner/session.jsonl
@@ -15,7 +15,7 @@
 {"type":"assistant/chunk","seq":13,"time":1785916902468,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
 {"type":"assistant/message","seq":14,"time":1785916902468,"data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"tool-call","id":"missing-runner-foreground","name":"bash","arguments":"{\"command\":\"true\",\"description\":\"Exercise missing sandbox runner\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"d588acd6-d0ab-43c5-9e18-67fe3f625e48"},"usage":{"inputTokens":1,"outputTokens":1}},"sourceEventSeqs":[9,10,11,12,13],"surfaceOp":"append"}
 {"type":"tool/call","seq":15,"time":1785916902469,"data":{"turn":1,"step":1,"callId":"missing-runner-foreground","name":"bash","arguments":"{\"command\":\"true\",\"description\":\"Exercise missing sandbox runner\"}"}}
-{"type":"tool/result","seq":16,"time":1785916902487,"data":{"turn":1,"step":1,"message":{"source":{"kind":"tool","callId":"missing-runner-foreground"},"content":[{"type":"tool-result","toolCallId":"missing-runner-foreground","content":[{"type":"text","text":"Error: sandbox mode \"read-only\" is requested but no sandbox backend is usable on this host; refusing to run the command unconfined. Install bubblewrap or run a Landlock-enforcing kernel (Linux), ensure sandbox-exec is usable (macOS) — Windows has no confinement backend yet — or switch the consumer to danger-full-access. Runner failure: Error: spawn {{cwd}}/.dsh-missing-sandbox-runner ENOENT"}],"isError":true}],"role":"user","id":"f7345e02-407b-483f-be7a-75a4fc1c37a7"},"error":{"name":"SandboxUnavailableError","code":"SANDBOX_UNAVAILABLE"}},"sourceEventSeqs":[15],"surfaceOp":"append"}
+{"type":"tool/result","seq":16,"time":1785916902487,"data":{"turn":1,"step":1,"message":{"source":{"kind":"tool","callId":"missing-runner-foreground"},"content":[{"type":"tool-result","toolCallId":"missing-runner-foreground","content":[{"type":"text","text":"Error: sandbox mode \"read-only\" is requested but no sandbox backend is usable on this host; refusing to run the command unconfined. Install bubblewrap or run a Landlock-enforcing kernel (Linux), ensure sandbox-exec is usable (macOS), or ensure the ACL restricted-token runner can start (Windows) — otherwise switch the consumer to danger-full-access. Runner failure: Error: spawn {{cwd}}/.dsh-missing-sandbox-runner ENOENT"}],"isError":true}],"role":"user","id":"f7345e02-407b-483f-be7a-75a4fc1c37a7"},"error":{"name":"SandboxUnavailableError","code":"SANDBOX_UNAVAILABLE"}},"sourceEventSeqs":[15],"surfaceOp":"append"}
 {"type":"step/end","seq":17,"time":1785916902487,"data":{"turn":1,"step":1}}
 {"type":"step/start","seq":18,"time":1785916902496,"data":{"turn":1,"step":2}}
 {"type":"assistant/chunk","seq":19,"time":1785304900018,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}