diff --git a/examples/acp-agent/tests/fixtures/subagent-durability-failure.ts b/examples/acp-agent/tests/fixtures/subagent-durability-failure.ts
index 8352dac005..5499936667 100644
--- a/examples/acp-agent/tests/fixtures/subagent-durability-failure.ts
+++ b/examples/acp-agent/tests/fixtures/subagent-durability-failure.ts
@@ -22,7 +22,7 @@ export const inject = ['sessionPersistence', 'subagents']
 const PLACEHOLDER_CHILD_ID = '33333333-3333-4333-8333-333333333333'
 const UNKNOWN_CHILD_ID = '22222222-2222-4222-8222-222222222222'
 /** The child continuation turn whose durability checkpoint is forced to fail. */
-const FAILED_CHECKPOINT_TURN = 4
+const FAILED_CHECKPOINT_TURN = 3
 
 /** Fail the child checkpoint and stabilize the authored follow-up failure ordering. */
 export function apply(ctx: Context): void {
diff --git a/examples/acp-agent/tests/snapshots/subagent-continuable/session.1.jsonl b/examples/acp-agent/tests/snapshots/subagent-continuable/session.1.jsonl
index a5220ed410..653f212a06 100644
--- a/examples/acp-agent/tests/snapshots/subagent-continuable/session.1.jsonl
+++ b/examples/acp-agent/tests/snapshots/subagent-continuable/session.1.jsonl
@@ -1,31 +1,32 @@
-{"type":"session","version":0,"id":"33333333-3333-4333-8333-333333333333","createdAt":1789000001000,"cwd":"/tmp/subagent-continuable","parentSession":"11111111-1111-4111-8111-111111111111","delegationDepth":1}
-{"type":"turn/start","seq":0,"time":1789000000001,"data":{"turn":1,"trigger":{"kind":"subagent-descriptor"}}}
-{"type":"subagent/descriptor","seq":1,"time":1789000000002,"data":{"version":1,"provider":"spawn","agentProvider":"deepseek","agentModel":"deepseek-v4-flash"}}
-{"type":"turn/end","seq":2,"time":1789000000003,"data":{"turn":1,"reason":{"kind":"completed"}}}
-{"type":"turn/start","seq":3,"time":1789000000004,"data":{"turn":2,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":4,"time":1789000000005,"data":{"content":[{"type":"text","text":"Reply with exactly the word CHILD_OK and nothing else."}],"source":{"kind":"user"}},"surfaceOp":"append"}
-{"type":"session/title","seq":5,"time":1789000000005,"data":{"title":"Reply with exactly the word","messageSeqs":[4],"source":{"kind":"fallback"}}}
-{"type":"step/start","seq":6,"time":1789000000006,"data":{"turn":2,"step":1}}
-{"type":"request/header","seq":7,"time":1789000000007,"data":{"header":{"config":{"provider":"deepseek","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
-{"type":"assistant/chunk","seq":8,"time":1789000000008,"data":{"turn":2,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
-{"type":"assistant/chunk","seq":9,"time":1789000000009,"data":{"turn":2,"step":1,"chunk":{"type":"text-delta","index":0,"text":"CHILD_OK"}}}
-{"type":"assistant/chunk","seq":10,"time":1789000000010,"data":{"turn":2,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"CHILD_OK"}}}}
-{"type":"assistant/chunk","seq":11,"time":1789000000011,"data":{"turn":2,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}}}
-{"type":"assistant/chunk","seq":12,"time":1789000000012,"data":{"turn":2,"step":1,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
-{"type":"assistant/message","seq":13,"time":1789000000013,"data":{"turn":2,"step":1,"content":[{"type":"text","text":"CHILD_OK"}],"provenance":{"provider":"deepseek","model":"deepseek-v4-flash"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[8,9,10,11,12],"surfaceOp":"append"}
-{"type":"step/end","seq":14,"time":1789000000014,"data":{"turn":2,"step":1}}
-{"type":"turn/end","seq":15,"time":1789000000015,"data":{"turn":2,"reason":{"kind":"completed"}}}
-{"type":"turn/start","seq":16,"time":1789000000016,"data":{"turn":3,"trigger":{"kind":"message","source":{"kind":"coordinator","senderSessionId":"11111111-1111-4111-8111-111111111111"}}}}
-{"type":"user/message","seq":17,"time":1789000000017,"data":{"content":[{"type":"text","text":"Now reply with exactly SECOND_OK."}],"source":{"kind":"coordinator","senderSessionId":"11111111-1111-4111-8111-111111111111"}},"surfaceOp":"append"}
-{"type":"step/start","seq":18,"time":1789000000018,"data":{"turn":3,"step":1}}
-{"type":"assistant/chunk","seq":19,"time":1785394678743,"data":{"turn":3,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
-{"type":"assistant/chunk","seq":20,"time":1789000000020,"data":{"turn":3,"step":1,"chunk":{"type":"text-delta","index":0,"text":"SECOND_OK"}}}
-{"type":"assistant/chunk","seq":21,"time":1789000000021,"data":{"turn":3,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"SECOND_OK"}}}}
-{"type":"assistant/chunk","seq":22,"time":1789000000022,"data":{"turn":3,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}}}
-{"type":"assistant/chunk","seq":23,"time":1789000000023,"data":{"turn":3,"step":1,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
-{"type":"assistant/message","seq":24,"time":1785394678743,"data":{"turn":3,"step":1,"content":[{"type":"text","text":"SECOND_OK"}],"provenance":{"provider":"deepseek","model":"deepseek-v4-flash"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[19,20,21,22,23],"surfaceOp":"append"}
-{"type":"step/end","seq":25,"time":1785394678743,"data":{"turn":3,"step":1}}
-{"type":"turn/end","seq":26,"time":1785394678743,"data":{"turn":3,"reason":{"kind":"completed"}}}
-{"type":"turn/start","seq":27,"time":1785394678756,"data":{"turn":4,"trigger":{"kind":"message","source":{"kind":"coordinator","senderSessionId":"11111111-1111-4111-8111-111111111111"}}}}
-{"type":"user/message","seq":28,"time":1785394678756,"data":{"content":[{"type":"text","text":"Now reply with exactly THIRD_OK."}],"source":{"kind":"coordinator","senderSessionId":"11111111-1111-4111-8111-111111111111"}},"surfaceOp":"append"}
-{"type":"turn/end","seq":29,"time":1785394678762,"data":{"turn":4,"reason":{"kind":"error","step":1,"message":"snapshot disk full"}}}
+{"type":"session","version":0,"id":"33333333-3333-4333-8333-333333333333","createdAt":1789000001000,"cwd":"{{cwd}}","parentSession":"11111111-1111-4111-8111-111111111111","delegationDepth":1}
+{"type":"subagent/descriptor","seq":0,"time":1785544945198,"data":{"version":1,"provider":"spawn","agentProvider":"deepseek-official","agentModel":"deepseek-v4-flash"}}
+{"type":"session/end-seed","seq":1,"time":1785544945198,"data":{}}
+{"type":"turn/start","seq":2,"time":1785544945199,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
+{"type":"user/message","seq":3,"time":1785544945199,"data":{"content":[{"type":"text","text":"Reply with exactly the word CHILD_OK and nothing else."}],"source":{"kind":"user"},"role":"user","id":"cd28c816-821e-412c-bc7f-404bbb599641"},"surfaceOp":"append"}
+{"type":"session/title","seq":4,"time":1785544945199,"data":{"title":"Reply with exactly the word","messageSeqs":[3],"source":{"kind":"fallback"}}}
+{"type":"user/message","seq":5,"time":1789000000005,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations.\n\nApproval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt"},"role":"user","id":"2ea12eb1-e86f-447a-8574-63f2d819c689"},"surfaceOp":"append"}
+{"type":"step/start","seq":6,"time":1785544945227,"data":{"turn":1,"step":1}}
+{"type":"request/header","seq":7,"time":1785544945227,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
+{"type":"request/context","seq":8,"time":1785544945227,"data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
+{"type":"assistant/chunk","seq":9,"time":1789000000008,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
+{"type":"assistant/chunk","seq":10,"time":1789000000009,"data":{"turn":1,"step":1,"chunk":{"type":"text-delta","index":0,"text":"CHILD_OK"}}}
+{"type":"assistant/chunk","seq":11,"time":1789000000010,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"CHILD_OK"}}}}
+{"type":"assistant/chunk","seq":12,"time":1789000000011,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}}}
+{"type":"assistant/chunk","seq":13,"time":1789000000012,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":14,"time":1789000000013,"data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"text","text":"CHILD_OK"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"99ab55a3-f42f-4816-8fff-3b3bcb15fa6b"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[9,10,11,12,13],"surfaceOp":"append"}
+{"type":"step/end","seq":15,"time":1789000000014,"data":{"turn":1,"step":1}}
+{"type":"turn/end","seq":16,"time":1789000000015,"data":{"turn":1,"reason":{"kind":"completed"}}}
+{"type":"turn/start","seq":17,"time":1789000000016,"data":{"turn":2,"trigger":{"kind":"message","source":{"kind":"coordinator","senderSessionId":"11111111-1111-4111-8111-111111111111"}}}}
+{"type":"user/message","seq":18,"time":1789000000017,"data":{"content":[{"type":"text","text":"Now reply with exactly SECOND_OK."}],"source":{"kind":"coordinator","senderSessionId":"11111111-1111-4111-8111-111111111111"},"role":"user","id":"70a11623-f9c9-43d1-bad6-9bf45d19dd90"},"surfaceOp":"append"}
+{"type":"step/start","seq":19,"time":1789000000018,"data":{"turn":2,"step":1}}
+{"type":"assistant/chunk","seq":20,"time":1785394678743,"data":{"turn":2,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
+{"type":"assistant/chunk","seq":21,"time":1789000000020,"data":{"turn":2,"step":1,"chunk":{"type":"text-delta","index":0,"text":"SECOND_OK"}}}
+{"type":"assistant/chunk","seq":22,"time":1789000000021,"data":{"turn":2,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"SECOND_OK"}}}}
+{"type":"assistant/chunk","seq":23,"time":1789000000022,"data":{"turn":2,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}}}
+{"type":"assistant/chunk","seq":24,"time":1789000000023,"data":{"turn":2,"step":1,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":25,"time":1785394678743,"data":{"turn":2,"step":1,"message":{"role":"assistant","content":[{"type":"text","text":"SECOND_OK"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"86c9fc2b-900b-4a84-9089-dd4b8ed3d2d6"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[20,21,22,23,24],"surfaceOp":"append"}
+{"type":"step/end","seq":26,"time":1785394678743,"data":{"turn":2,"step":1}}
+{"type":"turn/end","seq":27,"time":1785394678743,"data":{"turn":2,"reason":{"kind":"completed"}}}
+{"type":"turn/start","seq":28,"time":1785394678756,"data":{"turn":3,"trigger":{"kind":"message","source":{"kind":"coordinator","senderSessionId":"11111111-1111-4111-8111-111111111111"}}}}
+{"type":"user/message","seq":29,"time":1785394678756,"data":{"content":[{"type":"text","text":"Now reply with exactly THIRD_OK."}],"source":{"kind":"coordinator","senderSessionId":"11111111-1111-4111-8111-111111111111"},"role":"user","id":"c3a91e09-99fc-4303-92e4-d8e89cb767f4"},"surfaceOp":"append"}
+{"type":"turn/end","seq":30,"time":1785545035946,"data":{"turn":3,"reason":{"kind":"error","step":1,"message":"snapshot disk full"}}}
diff --git a/examples/acp-agent/tests/snapshots/subagent-continuable/session.jsonl b/examples/acp-agent/tests/snapshots/subagent-continuable/session.jsonl
index 4dff6a044a..4d0602e8df 100644
--- a/examples/acp-agent/tests/snapshots/subagent-continuable/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/subagent-continuable/session.jsonl
@@ -1,54 +1,56 @@
-{"type":"session","version":0,"id":"11111111-1111-4111-8111-111111111111","createdAt":1789000000000,"cwd":"/tmp/subagent-continuable","delegationDepth":0}
+{"type":"session","version":0,"id":"11111111-1111-4111-8111-111111111111","createdAt":1789000000000,"cwd":"{{cwd}}","delegationDepth":0}
 {"type":"turn/start","seq":0,"time":1789000000001,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":1789000000002,"data":{"content":[{"type":"text","text":"Follow these steps exactly, then stop. 1. Call the subagent tool once with run_in_background set to true, description 'Reply with CHILD_OK', and prompt 'Reply with exactly the word CHILD_OK and nothing else.'. 2. Call send_message twice in a row, both with the subagent id from step 1: first with message 'Now reply with exactly SECOND_OK.', then with message 'Now reply with exactly THIRD_OK.'. 3. Call send_message with subagent_id exactly '22222222-2222-4222-8222-222222222222' (a subagent that does not exist) and message 'Please continue.', and observe that it fails. 4. Reply with the single word DONE. Do not use the bash tool."}],"source":{"kind":"user"}},"surfaceOp":"append"}
+{"type":"user/message","seq":1,"time":1789000000002,"data":{"content":[{"type":"text","text":"Follow these steps exactly, then stop. 1. Call the subagent tool once with run_in_background set to true, description 'Reply with CHILD_OK', and prompt 'Reply with exactly the word CHILD_OK and nothing else.'. 2. Call send_message twice in a row, both with the subagent id from step 1: first with message 'Now reply with exactly SECOND_OK.', then with message 'Now reply with exactly THIRD_OK.'. 3. Call send_message with subagent_id exactly '22222222-2222-4222-8222-222222222222' (a subagent that does not exist) and message 'Please continue.', and observe that it fails. 4. Reply with the single word DONE. Do not use the bash tool."}],"source":{"kind":"user"},"role":"user","id":"9472efc7-dd29-439f-8387-9b2dee43cd33"},"surfaceOp":"append"}
 {"type":"session/title","seq":2,"time":1789000000003,"data":{"title":"Follow these steps exactly, then","messageSeqs":[1],"source":{"kind":"fallback"}}}
-{"type":"step/start","seq":3,"time":1789000000004,"data":{"turn":1,"step":1}}
-{"type":"request/header","seq":4,"time":1789000000005,"data":{"header":{"config":{"provider":"deepseek","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
-{"type":"assistant/chunk","seq":5,"time":1789000000006,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
-{"type":"assistant/chunk","seq":6,"time":1789000000007,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":0,"id":"call_bg_start","name":"subagent","argumentsDelta":"{\"description\": \"Reply with CHILD_OK\", \"prompt\": \"Reply with exactly the word CHILD_OK and nothing else.\", \"run_in_background\": true}"}}}
-{"type":"assistant/chunk","seq":7,"time":1789000000008,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"call_bg_start","name":"subagent","arguments":"{\"description\": \"Reply with CHILD_OK\", \"prompt\": \"Reply with exactly the word CHILD_OK and nothing else.\", \"run_in_background\": true}"}}}}
-{"type":"assistant/chunk","seq":8,"time":1789000000009,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}}}
-{"type":"assistant/chunk","seq":9,"time":1789000000010,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
-{"type":"assistant/message","seq":10,"time":1789000000011,"data":{"turn":1,"step":1,"content":[{"type":"tool-call","id":"call_bg_start","name":"subagent","arguments":"{\"description\": \"Reply with CHILD_OK\", \"prompt\": \"Reply with exactly the word CHILD_OK and nothing else.\", \"run_in_background\": true}"}],"provenance":{"provider":"deepseek","model":"deepseek-v4-flash"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[5,6,7,8,9],"surfaceOp":"append"}
-{"type":"tool/call","seq":11,"time":1789000000012,"data":{"turn":1,"step":1,"callId":"call_bg_start","name":"subagent","arguments":"{\"description\": \"Reply with CHILD_OK\", \"prompt\": \"Reply with exactly the word CHILD_OK and nothing else.\", \"run_in_background\": true}"}}
-{"type":"tool/result","seq":12,"time":1789000000013,"data":{"turn":1,"step":1,"callId":"call_bg_start","content":[{"type":"text","text":"started subagent 33333333-3333-4333-8333-333333333333"}],"isError":false},"sourceEventSeqs":[11],"surfaceOp":"append"}
-{"type":"step/end","seq":13,"time":1789000000014,"data":{"turn":1,"step":1}}
-{"type":"step/start","seq":14,"time":1789000000015,"data":{"turn":1,"step":2}}
-{"type":"assistant/chunk","seq":15,"time":1785394678688,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
-{"type":"assistant/chunk","seq":16,"time":1789000000017,"data":{"turn":1,"step":2,"chunk":{"type":"tool-call-delta","index":0,"id":"call_followup_1","name":"send_message","argumentsDelta":"{\"subagent_id\": \"33333333-3333-4333-8333-333333333333\", \"message\": \"Now reply with exactly SECOND_OK.\"}"}}}
-{"type":"assistant/chunk","seq":17,"time":1789000000018,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"call_followup_1","name":"send_message","arguments":"{\"subagent_id\": \"33333333-3333-4333-8333-333333333333\", \"message\": \"Now reply with exactly SECOND_OK.\"}"}}}}
-{"type":"assistant/chunk","seq":18,"time":1789000000019,"data":{"turn":1,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}}}
-{"type":"assistant/chunk","seq":19,"time":1789000000020,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
-{"type":"assistant/message","seq":20,"time":1785394678689,"data":{"turn":1,"step":2,"content":[{"type":"tool-call","id":"call_followup_1","name":"send_message","arguments":"{\"subagent_id\": \"33333333-3333-4333-8333-333333333333\", \"message\": \"Now reply with exactly SECOND_OK.\"}"}],"provenance":{"provider":"deepseek","model":"deepseek-v4-flash"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[15,16,17,18,19],"surfaceOp":"append"}
-{"type":"tool/call","seq":21,"time":1785394678689,"data":{"turn":1,"step":2,"callId":"call_followup_1","name":"send_message","arguments":"{\"subagent_id\": \"33333333-3333-4333-8333-333333333333\", \"message\": \"Now reply with exactly SECOND_OK.\"}"}}
-{"type":"tool/result","seq":22,"time":1785394678701,"data":{"turn":1,"step":2,"callId":"call_followup_1","content":[{"type":"text","text":"message queued as the next turn for subagent 33333333-3333-4333-8333-333333333333"}],"isError":false},"sourceEventSeqs":[21],"surfaceOp":"append"}
-{"type":"step/end","seq":23,"time":1785394678701,"data":{"turn":1,"step":2}}
-{"type":"step/start","seq":24,"time":1785394678713,"data":{"turn":1,"step":3}}
-{"type":"assistant/chunk","seq":25,"time":1785394678718,"data":{"turn":1,"step":3,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
-{"type":"assistant/chunk","seq":26,"time":1785394678719,"data":{"turn":1,"step":3,"chunk":{"type":"tool-call-delta","index":0,"id":"call_followup_2","name":"send_message","argumentsDelta":"{\"subagent_id\": \"33333333-3333-4333-8333-333333333333\", \"message\": \"Now reply with exactly THIRD_OK.\"}"}}}
-{"type":"assistant/chunk","seq":27,"time":1789000000028,"data":{"turn":1,"step":3,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"call_followup_2","name":"send_message","arguments":"{\"subagent_id\": \"33333333-3333-4333-8333-333333333333\", \"message\": \"Now reply with exactly THIRD_OK.\"}"}}}}
-{"type":"assistant/chunk","seq":28,"time":1789000000029,"data":{"turn":1,"step":3,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}}}
-{"type":"assistant/chunk","seq":29,"time":1789000000030,"data":{"turn":1,"step":3,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
-{"type":"assistant/message","seq":30,"time":1785394678719,"data":{"turn":1,"step":3,"content":[{"type":"tool-call","id":"call_followup_2","name":"send_message","arguments":"{\"subagent_id\": \"33333333-3333-4333-8333-333333333333\", \"message\": \"Now reply with exactly THIRD_OK.\"}"}],"provenance":{"provider":"deepseek","model":"deepseek-v4-flash"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[25,26,27,28,29],"surfaceOp":"append"}
-{"type":"tool/call","seq":31,"time":1785394678719,"data":{"turn":1,"step":3,"callId":"call_followup_2","name":"send_message","arguments":"{\"subagent_id\": \"33333333-3333-4333-8333-333333333333\", \"message\": \"Now reply with exactly THIRD_OK.\"}"}}
-{"type":"tool/result","seq":32,"time":1785394678733,"data":{"turn":1,"step":3,"callId":"call_followup_2","content":[{"type":"text","text":"message queued as the next turn for subagent 33333333-3333-4333-8333-333333333333"}],"isError":false},"sourceEventSeqs":[31],"surfaceOp":"append"}
-{"type":"step/end","seq":33,"time":1785394678733,"data":{"turn":1,"step":3}}
-{"type":"step/start","seq":34,"time":1785394678746,"data":{"turn":1,"step":4}}
-{"type":"assistant/chunk","seq":35,"time":1785394678752,"data":{"turn":1,"step":4,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
-{"type":"assistant/chunk","seq":36,"time":1785394678753,"data":{"turn":1,"step":4,"chunk":{"type":"tool-call-delta","index":0,"id":"call_followup_unknown","name":"send_message","argumentsDelta":"{\"subagent_id\": \"22222222-2222-4222-8222-222222222222\", \"message\": \"Please continue.\"}"}}}
-{"type":"assistant/chunk","seq":37,"time":1785394678753,"data":{"turn":1,"step":4,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"call_followup_unknown","name":"send_message","arguments":"{\"subagent_id\": \"22222222-2222-4222-8222-222222222222\", \"message\": \"Please continue.\"}"}}}}
-{"type":"assistant/chunk","seq":38,"time":1789000000039,"data":{"turn":1,"step":4,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}}}
-{"type":"assistant/chunk","seq":39,"time":1789000000040,"data":{"turn":1,"step":4,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
-{"type":"assistant/message","seq":40,"time":1785394678753,"data":{"turn":1,"step":4,"content":[{"type":"tool-call","id":"call_followup_unknown","name":"send_message","arguments":"{\"subagent_id\": \"22222222-2222-4222-8222-222222222222\", \"message\": \"Please continue.\"}"}],"provenance":{"provider":"deepseek","model":"deepseek-v4-flash"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[35,36,37,38,39],"surfaceOp":"append"}
-{"type":"tool/call","seq":41,"time":1785394678753,"data":{"turn":1,"step":4,"callId":"call_followup_unknown","name":"send_message","arguments":"{\"subagent_id\": \"22222222-2222-4222-8222-222222222222\", \"message\": \"Please continue.\"}"}}
-{"type":"tool/result","seq":42,"time":1785394678765,"data":{"turn":1,"step":4,"callId":"call_followup_unknown","content":[{"type":"text","text":"Error: subagent \"22222222-2222-4222-8222-222222222222\" is unavailable"}],"isError":true,"error":{"name":"SubagentError","code":"NOT_RESUMABLE"}},"sourceEventSeqs":[41],"surfaceOp":"append"}
-{"type":"step/end","seq":43,"time":1785394678765,"data":{"turn":1,"step":4}}
-{"type":"step/start","seq":44,"time":1785394678774,"data":{"turn":1,"step":5}}
-{"type":"assistant/chunk","seq":45,"time":1785394678778,"data":{"turn":1,"step":5,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
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