diff --git a/examples/python-sdk-agent/tests/snapshots/bash-tool/notifications.expected.jsonl b/examples/python-sdk-agent/tests/snapshots/bash-tool/notifications.expected.jsonl
index 4f2601b62c..e3eb6978b6 100644
--- a/examples/python-sdk-agent/tests/snapshots/bash-tool/notifications.expected.jsonl
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diff --git a/examples/python-sdk-agent/tests/snapshots/bash-tool/session.jsonl b/examples/python-sdk-agent/tests/snapshots/bash-tool/session.jsonl
index ab9e6ef440..2a6bb9e092 100644
--- a/examples/python-sdk-agent/tests/snapshots/bash-tool/session.jsonl
+++ b/examples/python-sdk-agent/tests/snapshots/bash-tool/session.jsonl
@@ -1,33 +1,37 @@
 {"type":"session","version":0,"id":"sdk-snapshot-bash","createdAt":1785097395899,"cwd":"{{cwd}}","delegationDepth":0}
+{"type":"permission/preset","data":{"preset":"workspace-write"}}
+{"type":"sandbox/mode","data":{"mode":"workspace-write"}}
+{"type":"approval/policy","data":{"policy":"ask"}}
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-{"type":"session/title","data":{"title":"Run this exact command with","messageSeqs":[4],"source":{"kind":"fallback"}}}
+{"type":"user/message","data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: workspace-write. Any available operation enforced by the DSH file sandbox may modify files under the session workspace: \"{{cwd}}\". Some platform temporary areas may also be writable.\n\nApproval policy: ask. Operations that require approval may ask through the configured answerers; without an available answerer, the request fails closed."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt","form":"snapshot","sections":[{"name":"sandbox:policy","text":"Current DSH file policy: workspace-write. Any available operation enforced by the DSH file sandbox may modify files under the session workspace: \"{{cwd}}\". Some platform temporary areas may also be writable."},{"name":"approval:policy","text":"Approval policy: ask. Operations that require approval may ask through the configured answerers; without an available answerer, the request fails closed."}]},"role":"user","id":"387243dc-bb37-43b0-810f-69450615fb1f"},"surfaceOp":"append"}
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diff --git a/examples/python-sdk-agent/tests/snapshots/persistent-tools/notifications.expected.jsonl b/examples/python-sdk-agent/tests/snapshots/persistent-tools/notifications.expected.jsonl
index 550d3495f9..abb7e0307d 100644
--- a/examples/python-sdk-agent/tests/snapshots/persistent-tools/notifications.expected.jsonl
+++ b/examples/python-sdk-agent/tests/snapshots/persistent-tools/notifications.expected.jsonl
@@ -4,75 +4,76 @@
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 {"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"user/message","seq":4,"time":0,"data":{"content":[{"type":"text","text":"Prove that bash state persists. Then create {{cwd}}/note.txt with a tab-indented line, view it, replace that literal tab-indented line, and make the persistent shell exit with code 9."}],"source":{"kind":"user"},"role":"user","id":"{{sessionId}}"},"surfaceOp":"append"}}}
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-{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"request/header","seq":6,"time":0,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}}}
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+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":53,"time":0,"data":{"turn":1,"step":5,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/message","seq":54,"time":0,"data":{"turn":1,"step":5,"message":{"role":"assistant","content":[{"type":"tool-call","id":"editor-replace","name":"str_replace_editor","arguments":"{\"command\":\"str_replace\",\"path\":\"{{cwd}}/note.txt\",\"old_str\":\"\\told\",\"new_str\":\"\\tnew\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[49,50,51,52,53],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/call","seq":55,"time":0,"data":{"turn":1,"step":5,"callId":"editor-replace","name":"str_replace_editor","arguments":"{\"command\":\"str_replace\",\"path\":\"{{cwd}}/note.txt\",\"old_str\":\"\\told\",\"new_str\":\"\\tnew\"}"}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/result","seq":56,"time":0,"data":{"turn":1,"step":5,"message":{"source":{"kind":"tool","callId":"editor-replace"},"content":[{"type":"tool-result","toolCallId":"editor-replace","content":[{"type":"text","text":"The file {{cwd}}/note.txt has been edited successfully."}],"isError":false}],"role":"user","id":"{{sessionId}}"}},"sourceEventSeqs":[55],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/end","seq":57,"time":0,"data":{"turn":1,"step":5}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/start","seq":58,"time":0,"data":{"turn":1,"step":6}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":59,"time":0,"data":{"turn":1,"step":6,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":60,"time":0,"data":{"turn":1,"step":6,"chunk":{"type":"tool-call-delta","index":0,"id":"bash-exit","name":"bash","argumentsDelta":"{\"command\":\"exit 9\"}"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":61,"time":0,"data":{"turn":1,"step":6,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"bash-exit","name":"bash","arguments":"{\"command\":\"exit 9\"}"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":62,"time":0,"data":{"turn":1,"step":6,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":63,"time":0,"data":{"turn":1,"step":6,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/message","seq":64,"time":0,"data":{"turn":1,"step":6,"message":{"role":"assistant","content":[{"type":"tool-call","id":"bash-exit","name":"bash","arguments":"{\"command\":\"exit 9\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[59,60,61,62,63],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/call","seq":65,"time":0,"data":{"turn":1,"step":6,"callId":"bash-exit","name":"bash","arguments":"{\"command\":\"exit 9\"}"}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/result","seq":66,"time":0,"data":{"turn":1,"step":6,"message":{"source":{"kind":"tool","callId":"bash-exit"},"content":[{"type":"tool-result","toolCallId":"bash-exit","content":[{"type":"text","text":"exit\n[shell exited: code 9]\nThe persistent bash shell was reset; the next bash call starts from the workspace with a fresh current directory and environment."}],"isError":false}],"role":"user","id":"{{sessionId}}"}},"sourceEventSeqs":[65],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/end","seq":67,"time":0,"data":{"turn":1,"step":6}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/start","seq":68,"time":0,"data":{"turn":1,"step":7}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":69,"time":0,"data":{"turn":1,"step":7,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":70,"time":0,"data":{"turn":1,"step":7,"chunk":{"type":"text-delta","index":0,"text":"PERSISTENT_TOOLS_OK"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":71,"time":0,"data":{"turn":1,"step":7,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"PERSISTENT_TOOLS_OK"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":72,"time":0,"data":{"turn":1,"step":7,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":73,"time":0,"data":{"turn":1,"step":7,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/message","seq":74,"time":0,"data":{"turn":1,"step":7,"message":{"role":"assistant","content":[{"type":"text","text":"PERSISTENT_TOOLS_OK"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[69,70,71,72,73],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/end","seq":75,"time":0,"data":{"turn":1,"step":7}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"turn/end","seq":76,"time":0,"data":{"turn":1,"reason":{"kind":"completed"}}}}}
 {"method":"session.status","params":{"sessionId":"{{sessionId}}","status":"idle"}}
diff --git a/examples/python-sdk-agent/tests/snapshots/persistent-tools/session.jsonl b/examples/python-sdk-agent/tests/snapshots/persistent-tools/session.jsonl
index 33331daec0..424ae24a79 100644
--- a/examples/python-sdk-agent/tests/snapshots/persistent-tools/session.jsonl
+++ b/examples/python-sdk-agent/tests/snapshots/persistent-tools/session.jsonl
@@ -4,6 +4,7 @@
 {"type":"agent/inbox/spliced","data":{"target":"next-turn","start":0,"removedCount":1,"inserted":[]}}
 {"type":"step/start","data":{"turn":1,"step":1}}
 {"type":"user/message","data":{"content":[{"type":"text","text":"Prove that bash state persists. Then create {{cwd}}/note.txt with a tab-indented line, view it, replace that literal tab-indented line, and make the persistent shell exit with code 9."}],"source":{"kind":"user"},"role":"user","id":"9a08e199-69d7-4b85-bfa4-27b41a92672a"},"surfaceOp":"append"}
+{"type":"user/message","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","form":"snapshot","sections":[{"name":"sandbox:policy","text":"Current DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations."},{"name":"approval:policy","text":"Approval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}]},"role":"user","id":"b166da42-fa86-4f7a-acbf-cbaf64f3a335"},"surfaceOp":"append"}
 {"type":"session/title","data":{"title":"Prove that bash state persists.","messageSeqs":[4],"source":{"kind":"fallback"}}}
 {"type":"request/header","data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
 {"type":"request/context","data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
@@ -12,9 +13,9 @@
 {"type":"assistant/chunk","data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"bash-1","name":"bash","arguments":"{\"command\":\"cd /tmp && export DSH_EXAMPLE_COUNT=1 && printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}}}}
 {"type":"assistant/chunk","data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
 {"type":"assistant/chunk","data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
-{"type":"assistant/message","data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"tool-call","id":"bash-1","name":"bash","arguments":"{\"command\":\"cd /tmp && export DSH_EXAMPLE_COUNT=1 && printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"0d064526-8eff-482d-8525-ac478e1d1791"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[8,9,10,11,12],"surfaceOp":"append"}
+{"type":"assistant/message","data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"tool-call","id":"bash-1","name":"bash","arguments":"{\"command\":\"cd /tmp && export DSH_EXAMPLE_COUNT=1 && printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"0d064526-8eff-482d-8525-ac478e1d1791"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[9,10,11,12,13],"surfaceOp":"append"}
 {"type":"tool/call","data":{"turn":1,"step":1,"callId":"bash-1","name":"bash","arguments":"{\"command\":\"cd /tmp && export DSH_EXAMPLE_COUNT=1 && printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}}
-{"type":"tool/result","data":{"turn":1,"step":1,"message":{"source":{"kind":"tool","callId":"bash-1"},"content":[{"type":"tool-result","toolCallId":"bash-1","content":[{"type":"text","text":"COUNT=1 CWD=/tmp"}],"isError":false}],"role":"user","id":"2c01f81a-01ea-47e2-bf92-f7825b7cc69f"}},"sourceEventSeqs":[14],"surfaceOp":"append"}
+{"type":"tool/result","data":{"turn":1,"step":1,"message":{"source":{"kind":"tool","callId":"bash-1"},"content":[{"type":"tool-result","toolCallId":"bash-1","content":[{"type":"text","text":"COUNT=1 CWD=/tmp"}],"isError":false}],"role":"user","id":"2c01f81a-01ea-47e2-bf92-f7825b7cc69f"}},"sourceEventSeqs":[15],"surfaceOp":"append"}
 {"type":"step/end","data":{"turn":1,"step":1}}
 {"type":"step/start","data":{"turn":1,"step":2}}
 {"type":"assistant/chunk","data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
@@ -22,9 +23,9 @@
 {"type":"assistant/chunk","data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"bash-2","name":"bash","arguments":"{\"command\":\"DSH_EXAMPLE_COUNT=$((DSH_EXAMPLE_COUNT + 1)); printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}}}}
 {"type":"assistant/chunk","data":{"turn":1,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
 {"type":"assistant/chunk","data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
-{"type":"assistant/message","data":{"turn":1,"step":2,"message":{"role":"assistant","content":[{"type":"tool-call","id":"bash-2","name":"bash","arguments":"{\"command\":\"DSH_EXAMPLE_COUNT=$((DSH_EXAMPLE_COUNT + 1)); printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"ba4078ce-0e18-419a-b720-339918aecf26"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[18,19,20,21,22],"surfaceOp":"append"}
+{"type":"assistant/message","data":{"turn":1,"step":2,"message":{"role":"assistant","content":[{"type":"tool-call","id":"bash-2","name":"bash","arguments":"{\"command\":\"DSH_EXAMPLE_COUNT=$((DSH_EXAMPLE_COUNT + 1)); printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"ba4078ce-0e18-419a-b720-339918aecf26"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[19,20,21,22,23],"surfaceOp":"append"}
 {"type":"tool/call","data":{"turn":1,"step":2,"callId":"bash-2","name":"bash","arguments":"{\"command\":\"DSH_EXAMPLE_COUNT=$((DSH_EXAMPLE_COUNT + 1)); printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}}
-{"type":"tool/result","data":{"turn":1,"step":2,"message":{"source":{"kind":"tool","callId":"bash-2"},"content":[{"type":"tool-result","toolCallId":"bash-2","content":[{"type":"text","text":"COUNT=2 CWD=/tmp"}],"isError":false}],"role":"user","id":"6e3ad5e1-1149-44d5-bd20-d9cc0139c747"}},"sourceEventSeqs":[24],"surfaceOp":"append"}
+{"type":"tool/result","data":{"turn":1,"step":2,"message":{"source":{"kind":"tool","callId":"bash-2"},"content":[{"type":"tool-result","toolCallId":"bash-2","content":[{"type":"text","text":"COUNT=2 CWD=/tmp"}],"isError":false}],"role":"user","id":"6e3ad5e1-1149-44d5-bd20-d9cc0139c747"}},"sourceEventSeqs":[25],"surfaceOp":"append"}
 {"type":"step/end","data":{"turn":1,"step":2}}
 {"type":"step/start","data":{"turn":1,"step":3}}
 {"type":"assistant/chunk","data":{"turn":1,"step":3,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
@@ -32,9 +33,9 @@
 {"type":"assistant/chunk","data":{"turn":1,"step":3,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"editor-create","name":"str_replace_editor","arguments":"{\"command\":\"create\",\"path\":\"{{cwd}}/note.txt\",\"file_text\":\"target:\\n\\told\\n\"}"}}}}
 {"type":"assistant/chunk","data":{"turn":1,"step":3,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
 {"type":"assistant/chunk","data":{"turn":1,"step":3,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
-{"type":"assistant/message","data":{"turn":1,"step":3,"message":{"role":"assistant","content":[{"type":"tool-call","id":"editor-create","name":"str_replace_editor","arguments":"{\"command\":\"create\",\"path\":\"{{cwd}}/note.txt\",\"file_text\":\"target:\\n\\told\\n\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"e5769b2d-ea91-42fe-a78f-2f7f408f545e"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[28,29,30,31,32],"surfaceOp":"append"}
+{"type":"assistant/message","data":{"turn":1,"step":3,"message":{"role":"assistant","content":[{"type":"tool-call","id":"editor-create","name":"str_replace_editor","arguments":"{\"command\":\"create\",\"path\":\"{{cwd}}/note.txt\",\"file_text\":\"target:\\n\\told\\n\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"e5769b2d-ea91-42fe-a78f-2f7f408f545e"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[29,30,31,32,33],"surfaceOp":"append"}
 {"type":"tool/call","data":{"turn":1,"step":3,"callId":"editor-create","name":"str_replace_editor","arguments":"{\"command\":\"create\",\"path\":\"{{cwd}}/note.txt\",\"file_text\":\"target:\\n\\told\\n\"}"}}
-{"type":"tool/result","data":{"turn":1,"step":3,"message":{"source":{"kind":"tool","callId":"editor-create"},"content":[{"type":"tool-result","toolCallId":"editor-create","content":[{"type":"text","text":"New file created successfully at: {{cwd}}/note.txt"}],"isError":false}],"role":"user","id":"af41060c-7007-4ada-89d6-8b15a0e8be7c"}},"sourceEventSeqs":[34],"surfaceOp":"append"}
+{"type":"tool/result","data":{"turn":1,"step":3,"message":{"source":{"kind":"tool","callId":"editor-create"},"content":[{"type":"tool-result","toolCallId":"editor-create","content":[{"type":"text","text":"New file created successfully at: {{cwd}}/note.txt"}],"isError":false}],"role":"user","id":"af41060c-7007-4ada-89d6-8b15a0e8be7c"}},"sourceEventSeqs":[35],"surfaceOp":"append"}
 {"type":"step/end","data":{"turn":1,"step":3}}
 {"type":"step/start","data":{"turn":1,"step":4}}
 {"type":"assistant/chunk","data":{"turn":1,"step":4,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
@@ -42,9 +43,9 @@
 {"type":"assistant/chunk","data":{"turn":1,"step":4,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"editor-view","name":"str_replace_editor","arguments":"{\"command\":\"view\",\"path\":\"{{cwd}}/note.txt\"}"}}}}
 {"type":"assistant/chunk","data":{"turn":1,"step":4,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
 {"type":"assistant/chunk","data":{"turn":1,"step":4,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
-{"type":"assistant/message","data":{"turn":1,"step":4,"message":{"role":"assistant","content":[{"type":"tool-call","id":"editor-view","name":"str_replace_editor","arguments":"{\"command\":\"view\",\"path\":\"{{cwd}}/note.txt\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"0e9afabb-10a6-444c-ae22-fcdbb5e14695"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[38,39,40,41,42],"surfaceOp":"append"}
+{"type":"assistant/message","data":{"turn":1,"step":4,"message":{"role":"assistant","content":[{"type":"tool-call","id":"editor-view","name":"str_replace_editor","arguments":"{\"command\":\"view\",\"path\":\"{{cwd}}/note.txt\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"0e9afabb-10a6-444c-ae22-fcdbb5e14695"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[39,40,41,42,43],"surfaceOp":"append"}
 {"type":"tool/call","data":{"turn":1,"step":4,"callId":"editor-view","name":"str_replace_editor","arguments":"{\"command\":\"view\",\"path\":\"{{cwd}}/note.txt\"}"}}
-{"type":"tool/result","data":{"turn":1,"step":4,"message":{"source":{"kind":"tool","callId":"editor-view"},"content":[{"type":"tool-result","toolCallId":"editor-view","content":[{"type":"text","text":"Here's the content of {{cwd}}/note.txt with line numbers (which has a total of 3 lines):\n     1  target:\n     2  \told\n     3  \n"}],"isError":false}],"role":"user","id":"a4472b37-6311-4880-bce2-cc369f9bc34b"}},"sourceEventSeqs":[44],"surfaceOp":"append"}
+{"type":"tool/result","data":{"turn":1,"step":4,"message":{"source":{"kind":"tool","callId":"editor-view"},"content":[{"type":"tool-result","toolCallId":"editor-view","content":[{"type":"text","text":"Here's the content of {{cwd}}/note.txt with line numbers (which has a total of 3 lines):\n     1  target:\n     2  \told\n     3  \n"}],"isError":false}],"role":"user","id":"a4472b37-6311-4880-bce2-cc369f9bc34b"}},"sourceEventSeqs":[45],"surfaceOp":"append"}
 {"type":"step/end","data":{"turn":1,"step":4}}
 {"type":"step/start","data":{"turn":1,"step":5}}
 {"type":"assistant/chunk","data":{"turn":1,"step":5,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
@@ -52,9 +53,9 @@
 {"type":"assistant/chunk","data":{"turn":1,"step":5,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"editor-replace","name":"str_replace_editor","arguments":"{\"command\":\"str_replace\",\"path\":\"{{cwd}}/note.txt\",\"old_str\":\"\\told\",\"new_str\":\"\\tnew\"}"}}}}
 {"type":"assistant/chunk","data":{"turn":1,"step":5,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
 {"type":"assistant/chunk","data":{"turn":1,"step":5,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
-{"type":"assistant/message","data":{"turn":1,"step":5,"message":{"role":"assistant","content":[{"type":"tool-call","id":"editor-replace","name":"str_replace_editor","arguments":"{\"command\":\"str_replace\",\"path\":\"{{cwd}}/note.txt\",\"old_str\":\"\\told\",\"new_str\":\"\\tnew\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"ba189070-d46e-461e-969b-9bca032bb154"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[48,49,50,51,52],"surfaceOp":"append"}
+{"type":"assistant/message","data":{"turn":1,"step":5,"message":{"role":"assistant","content":[{"type":"tool-call","id":"editor-replace","name":"str_replace_editor","arguments":"{\"command\":\"str_replace\",\"path\":\"{{cwd}}/note.txt\",\"old_str\":\"\\told\",\"new_str\":\"\\tnew\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"ba189070-d46e-461e-969b-9bca032bb154"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[49,50,51,52,53],"surfaceOp":"append"}
 {"type":"tool/call","data":{"turn":1,"step":5,"callId":"editor-replace","name":"str_replace_editor","arguments":"{\"command\":\"str_replace\",\"path\":\"{{cwd}}/note.txt\",\"old_str\":\"\\told\",\"new_str\":\"\\tnew\"}"}}
-{"type":"tool/result","data":{"turn":1,"step":5,"message":{"source":{"kind":"tool","callId":"editor-replace"},"content":[{"type":"tool-result","toolCallId":"editor-replace","content":[{"type":"text","text":"The file {{cwd}}/note.txt has been edited successfully."}],"isError":false}],"role":"user","id":"17331db9-174b-4699-9c9e-3140921956c4"}},"sourceEventSeqs":[54],"surfaceOp":"append"}
+{"type":"tool/result","data":{"turn":1,"step":5,"message":{"source":{"kind":"tool","callId":"editor-replace"},"content":[{"type":"tool-result","toolCallId":"editor-replace","content":[{"type":"text","text":"The file {{cwd}}/note.txt has been edited successfully."}],"isError":false}],"role":"user","id":"17331db9-174b-4699-9c9e-3140921956c4"}},"sourceEventSeqs":[55],"surfaceOp":"append"}
 {"type":"step/end","data":{"turn":1,"step":5}}
 {"type":"step/start","data":{"turn":1,"step":6}}
 {"type":"assistant/chunk","data":{"turn":1,"step":6,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
@@ -62,9 +63,9 @@
 {"type":"assistant/chunk","data":{"turn":1,"step":6,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"bash-exit","name":"bash","arguments":"{\"command\":\"exit 9\"}"}}}}
 {"type":"assistant/chunk","data":{"turn":1,"step":6,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
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diff --git a/examples/python-sdk-agent/tests/snapshots/subagent-spawn-in-process/session.1.jsonl b/examples/python-sdk-agent/tests/snapshots/subagent-spawn-in-process/session.1.jsonl
index 610389b650..52aa539f93 100644
--- a/examples/python-sdk-agent/tests/snapshots/subagent-spawn-in-process/session.1.jsonl
+++ b/examples/python-sdk-agent/tests/snapshots/subagent-spawn-in-process/session.1.jsonl
@@ -1,22 +1,16 @@
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+{"type":"sandbox/mode","data":{"mode":"workspace-write","source":"delegation"}}
+{"type":"approval/policy","data":{"policy":"never","source":"delegation"}}
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diff --git a/examples/python-sdk-agent/tests/snapshots/subagent-spawn-in-process/session.jsonl b/examples/python-sdk-agent/tests/snapshots/subagent-spawn-in-process/session.jsonl
index 8117ac217e..198598c055 100644
--- a/examples/python-sdk-agent/tests/snapshots/subagent-spawn-in-process/session.jsonl
+++ b/examples/python-sdk-agent/tests/snapshots/subagent-spawn-in-process/session.jsonl
@@ -1,33 +1,37 @@
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diff --git a/examples/python-sdk-agent/tests/snapshots/text-turn/notifications.expected.jsonl b/examples/python-sdk-agent/tests/snapshots/text-turn/notifications.expected.jsonl
index 9ddc977448..0633e90c46 100644
--- a/examples/python-sdk-agent/tests/snapshots/text-turn/notifications.expected.jsonl
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+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":31,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" that"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":32,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"."}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":33,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":1,"blockType":"text"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":34,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"text-delta","index":1,"text":"SD"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":35,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"text-delta","index":1,"text":"K"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":36,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"text-delta","index":1,"text":" snapshot"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":37,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"text-delta","index":1,"text":" OK"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":38,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"The user wants me to reply with exactly \"SDK snapshot OK\". Let me do that."}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":39,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":1,"block":{"type":"text","text":"SDK snapshot OK"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":40,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":1769,"outputTokens":24,"cacheReadTokens":0,"reasoningTokens":19}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":41,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/message","seq":42,"time":0,"data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"reasoning","text":"The user wants me to reply with exactly \"SDK snapshot OK\". Let me do that."},{"type":"text","text":"SDK snapshot OK"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":1769,"outputTokens":24,"cacheReadTokens":0,"reasoningTokens":19}},"sourceEventSeqs":[13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/end","seq":43,"time":0,"data":{"turn":1,"step":1}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"turn/end","seq":44,"time":0,"data":{"turn":1,"reason":{"kind":"completed"}}}}}
 {"method":"session.status","params":{"sessionId":"{{sessionId}}","status":"idle"}}
diff --git a/examples/python-sdk-agent/tests/snapshots/text-turn/session.jsonl b/examples/python-sdk-agent/tests/snapshots/text-turn/session.jsonl
index 3438bae4c5..96aab3a5df 100644
--- a/examples/python-sdk-agent/tests/snapshots/text-turn/session.jsonl
+++ b/examples/python-sdk-agent/tests/snapshots/text-turn/session.jsonl
@@ -1,21 +1,25 @@
 {"type":"session","version":0,"id":"sdk-snapshot-text","createdAt":1785097381464,"cwd":"{{cwd}}","delegationDepth":0}
+{"type":"permission/preset","data":{"preset":"workspace-write"}}
+{"type":"sandbox/mode","data":{"mode":"workspace-write"}}
+{"type":"approval/policy","data":{"policy":"ask"}}
 {"type":"agent/inbox/spliced","data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"Reply with exactly: SDK snapshot OK"}],"source":{"kind":"user"},"role":"user","id":"2950333f-90ff-4b11-b8f9-082612c97488"}]}}
 {"type":"turn/start","data":{"turn":1}}
 {"type":"agent/inbox/spliced","data":{"target":"next-turn","start":0,"removedCount":1,"inserted":[]}}
 {"type":"step/start","data":{"turn":1,"step":1}}
 {"type":"user/message","data":{"content":[{"type":"text","text":"Reply with exactly: SDK snapshot OK"}],"source":{"kind":"user"},"role":"user","id":"2950333f-90ff-4b11-b8f9-082612c97488"},"surfaceOp":"append"}
-{"type":"session/title","data":{"title":"Reply with exactly: SDK snapshot","messageSeqs":[4],"source":{"kind":"fallback"}}}
+{"type":"user/message","data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: workspace-write. Any available operation enforced by the DSH file sandbox may modify files under the session workspace: \"{{cwd}}\". Some platform temporary areas may also be writable.\n\nApproval policy: ask. Operations that require approval may ask through the configured answerers; without an available answerer, the request fails closed."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt","form":"snapshot","sections":[{"name":"sandbox:policy","text":"Current DSH file policy: workspace-write. Any available operation enforced by the DSH file sandbox may modify files under the session workspace: \"{{cwd}}\". Some platform temporary areas may also be writable."},{"name":"approval:policy","text":"Approval policy: ask. Operations that require approval may ask through the configured answerers; without an available answerer, the request fails closed."}]},"role":"user","id":"a1a5154b-3f69-474c-926f-045c89af4577"},"surfaceOp":"append"}
+{"type":"session/title","data":{"title":"Reply with exactly: SDK snapshot","messageSeqs":[7],"source":{"kind":"fallback"}}}
 {"type":"request/header","data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
 {"type":"request/context","data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
-{"type":"session-log-deepseek/delivery-accepted","data":{"sessionId":"sdk-snapshot-text","throughSeq":7}}
+{"type":"session-log-deepseek/delivery-accepted","data":{"sessionId":"sdk-snapshot-text","throughSeq":11}}
 {"type":"assistant/chunk","data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"reasoning"}}}
-{"type":"reasoning-chunks","data":{"turn":1,"step":1,"index":0,"dt":[0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0],"texts":["The"," user"," wants"," me"," to"," reply"," with"," exactly"," \"","SD","K"," snapshot"," OK","\"."," Let"," me"," do"," that","."]}}
+{"type":"reasoning-chunks","data":{"turn":1,"step":1,"index":0,"dt":[0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0],"texts":["The"," user"," wants"," me"," to"," reply"," with"," exactly"," \"","SD","K"," snapshot"," OK","\"."," Let"," me"," do"," that","."]}}
 {"type":"assistant/chunk","data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":1,"blockType":"text"}}}
 {"type":"text-chunks","data":{"turn":1,"step":1,"index":1,"dt":[0,0,0],"texts":["SD","K"," snapshot"," OK"]}}
 {"type":"assistant/chunk","data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"The user wants me to reply with exactly \"SDK snapshot OK\". Let me do that."}}}}
 {"type":"assistant/chunk","data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":1,"block":{"type":"text","text":"SDK snapshot OK"}}}}
 {"type":"assistant/chunk","data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":1769,"outputTokens":24,"cacheReadTokens":0,"reasoningTokens":19}}}}
 {"type":"assistant/chunk","data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
-{"type":"assistant/message","data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"reasoning","text":"The user wants me to reply with exactly \"SDK snapshot OK\". Let me do that."},{"type":"text","text":"SDK snapshot OK"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"3dd28f2f-9314-41a8-bf15-851be3652c14"},"usage":{"inputTokens":1769,"outputTokens":24,"cacheReadTokens":0,"reasoningTokens":19}},"sourceEventSeqs":[9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37],"surfaceOp":"append"}
+{"type":"assistant/message","data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"reasoning","text":"The user wants me to reply with exactly \"SDK snapshot OK\". Let me do that."},{"type":"text","text":"SDK snapshot OK"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"3dd28f2f-9314-41a8-bf15-851be3652c14"},"usage":{"inputTokens":1769,"outputTokens":24,"cacheReadTokens":0,"reasoningTokens":19}},"sourceEventSeqs":[13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41],"surfaceOp":"append"}
 {"type":"step/end","data":{"turn":1,"step":1}}
 {"type":"turn/end","data":{"turn":1,"reason":{"kind":"completed"}}}