diff --git a/examples/jsonrpc-agent/subagent-dsh-sdk-diagnostic.snapshot.cordis.yml b/examples/jsonrpc-agent/subagent-dsh-sdk-diagnostic.snapshot.cordis.yml
index 20f642f63b..a7c6745c66 100644
--- a/examples/jsonrpc-agent/subagent-dsh-sdk-diagnostic.snapshot.cordis.yml
+++ b/examples/jsonrpc-agent/subagent-dsh-sdk-diagnostic.snapshot.cordis.yml
@@ -1,12 +1,23 @@
-# Keyless twin of subagent-dsh-sdk-diagnostic.cordis.yml: include the normal
-# JSON-RPC replay composition, then keep the real DSH SDK child process,
-# provider, and delegation tool.
+# Keyless twin of subagent-dsh-sdk-diagnostic.cordis.yml: keep the real DSH
+# SDK child process/provider/tool and replace only the external parent model.
 - id: base
   name: '@deepseek-ai/cordis-plugin-include'
   config:
-    path: ./cordis.snapshot.yml
+    path: ./cordis.yml
     patches:
+      - id: llm-deepseek
+        name: '@deepseek-ai/dsh-llm-deepseek'
+        disabled: true
       - insert:
+          - id: llm-replay
+            name: '@deepseek-ai/dsh-llm-replay'
+            config:
+              paceMs: 100
+              providers:
+                - id: deepseek-official
+                  name: DeepSeek
+                  models:
+                    - id: deepseek-v4-flash
           - id: subagent-dsh-sdk-diagnostic
             name: '@deepseek-ai/dsh-subagent-dsh-sdk'
             config:
diff --git a/examples/jsonrpc-agent/tests/snapshots/subagent-dsh-sdk-diagnostic/notifications.expected.jsonl b/examples/jsonrpc-agent/tests/snapshots/subagent-dsh-sdk-diagnostic/notifications.expected.jsonl
index 0179d03415..8f2603d217 100644
--- a/examples/jsonrpc-agent/tests/snapshots/subagent-dsh-sdk-diagnostic/notifications.expected.jsonl
+++ b/examples/jsonrpc-agent/tests/snapshots/subagent-dsh-sdk-diagnostic/notifications.expected.jsonl
@@ -27,22 +27,25 @@
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 {"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/end","seq":26,"time":0,"data":{"turn":1,"step":2}}}}
 {"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/start","seq":27,"time":0,"data":{"turn":1,"step":3}}}}
-{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":28,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}}}
-{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":29,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"tool-call-delta","index":0,"id":"call_dsh_sdk_output","name":"job_output","argumentsDelta":"{\"job_id\":\"subagent-1\",\"wait\":true}"}}}}}
-{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":30,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"call_dsh_sdk_output","name":"job_output","arguments":"{\"job_id\":\"subagent-1\",\"wait\":true}"}}}}}}
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-{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":32,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}}}
-{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/message","seq":33,"time":0,"data":{"turn":1,"step":3,"message":{"role":"assistant","content":[{"type":"tool-call","id":"call_dsh_sdk_output","name":"job_output","arguments":"{\"job_id\":\"subagent-1\",\"wait\":true}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[28,29,30,31,32],"surfaceOp":"append"}}}
-{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/call","seq":34,"time":0,"data":{"turn":1,"step":3,"callId":"call_dsh_sdk_output","name":"job_output","arguments":"{\"job_id\":\"subagent-1\",\"wait\":true}"}}}}
-{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/result","seq":35,"time":0,"data":{"turn":1,"step":3,"message":{"source":{"kind":"tool","callId":"call_dsh_sdk_output"},"content":[{"type":"tool-result","toolCallId":"call_dsh_sdk_output","content":[{"type":"text","text":"(no new output)\n[status: failed, error; diagnostic: Subagent failure (provider: DSH SDK; stage: session-run; category: child-error; child reason: error)]"}],"isError":false}],"role":"user","id":"{{sessionId}}"}},"sourceEventSeqs":[34],"surfaceOp":"append"}}}
-{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/end","seq":36,"time":0,"data":{"turn":1,"step":3}}}}
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-{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":40,"time":0,"data":{"turn":1,"step":4,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"PARENT_OBSERVED_DSH_SDK_DIAGNOSTIC"}}}}}}
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-{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"turn/end","seq":45,"time":0,"data":{"turn":1,"reason":{"kind":"completed"}}}}}
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+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/end","seq":47,"time":0,"data":{"turn":1,"step":4}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"turn/end","seq":48,"time":0,"data":{"turn":1,"reason":{"kind":"completed"}}}}}
 {"method":"session.status","params":{"sessionId":"{{sessionId}}","status":"idle"}}
diff --git a/examples/jsonrpc-agent/tests/snapshots/subagent-dsh-sdk-diagnostic/session.jsonl b/examples/jsonrpc-agent/tests/snapshots/subagent-dsh-sdk-diagnostic/session.jsonl
index 8dd6093966..a80db0253f 100644
--- a/examples/jsonrpc-agent/tests/snapshots/subagent-dsh-sdk-diagnostic/session.jsonl
+++ b/examples/jsonrpc-agent/tests/snapshots/subagent-dsh-sdk-diagnostic/session.jsonl
@@ -27,21 +27,24 @@
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