diff --git a/packages/test-support/session-snapshot/README.i18n.yaml b/packages/test-support/session-snapshot/README.i18n.yaml
index 7c43cd7f24..c498342d8f 100644
--- a/packages/test-support/session-snapshot/README.i18n.yaml
+++ b/packages/test-support/session-snapshot/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/test-support/session-snapshot/README.md
-README.md: a0305c9506e8b23303450f148533bda00233ea5e
-README.zh.md: 3d015bc2e9d92e4b1bac09c5fd164470909472a5
+README.md: 44ae91de27cb71f271500bc2dcd220af2b654f0c
+README.zh.md: 05a7bc9876da46587d5d13080bac570a5013bbda
diff --git a/packages/test-support/session-snapshot/README.md b/packages/test-support/session-snapshot/README.md
index a0305c9506..44ae91de27 100644
--- a/packages/test-support/session-snapshot/README.md
+++ b/packages/test-support/session-snapshot/README.md
@@ -68,7 +68,7 @@ defineAcpSnapshotSuite({
 })
 ```
 
-Each recorded-session directory carries a closed `snapshot.yml` manifest plus canonical parent and contiguous child roles. Parent filenames are `session[.vN].jsonl`; children are `session.<ordinal>[.vN].jsonl`; v0 omits `.v0`, positive versions use lowercase `.vN`, and every filename agrees with its header. A role may retain older generations, but the harness selects the numerically highest one. An owning manifest may declare `sessionFormat.version` plus one or more closed `coverage` names to keep that historical generation as an explicit migration fixture. Without that declaration, record and refresh write the current generation; replay also accepts the retained V3 baseline under the [corpus policy](../../../snapshots/AGENTS.md). The manifest also names the scenario, shipped profile, composition/header class, recording source, and only the replay, platform, permission, environment, workspace, or input facts the completed Session cannot reconstruct. Storage guards check tool results and portable paths in every selected parent and child role. Prompt/schema scrubbing, message identity, and prompt-before-request ordering apply to current generations; retained predecessors keep their historical representation. The adapter registers expected-output, Session-log, and optional `workspace.expected/` comparisons; guards reject orphan directories, missing roles, noncanonical names, absolute paths, malformed manifests, and platform-specific separators.
+Each recorded-session directory carries a closed `snapshot.yml` manifest plus canonical parent and contiguous child roles. Parent filenames are `session[.vN].jsonl`; children are `session.<ordinal>[.vN].jsonl`; v0 omits `.v0`, positive versions use lowercase `.vN`, and every filename agrees with its header. A role may retain older generations, but the harness selects the numerically highest one. An owning manifest may declare `sessionFormat.version` plus one or more closed `coverage` names to keep that historical generation as an explicit migration fixture. Without that declaration, record and refresh write the current generation; replay independently accepts the retained V3 baseline or the current generation for each parent/child role under the [corpus policy](../../../snapshots/AGENTS.md). An explicit `sessionFormat.version` requires every selected role to match that version. The manifest also names the scenario, shipped profile, composition/header class, recording source, and only the replay, platform, permission, environment, workspace, or input facts the completed Session cannot reconstruct. Storage guards check tool results and portable paths in every selected parent and child role. Prompt/schema scrubbing, message identity, and prompt-before-request ordering apply to current generations; retained predecessors keep their historical representation. The adapter registers expected-output, Session-log, and optional `workspace.expected/` comparisons; guards reject orphan directories, missing roles, noncanonical names, absolute paths, malformed manifests, and platform-specific separators.
 
 `normalizeSessionSnapshot` retains the complete Session header and event payloads but omits top-level `seq`/`time` envelopes from committed fixtures after normalizing paths and scrubbing system-prompt text and tool schemas; it also normalizes embedded stream clocks and historical packed-row `seq0`/`time0` envelopes, and catalog child-creation clocks. Event order and source-event references are preserved. Replay synthesizes the top-level envelopes in memory, while runtime persistence continues to write complete logs. Multi-session comparison validates expected and harvested logs through the strict build-static Session format catalog before identity redaction and normalization; source filenames cannot alter format validation. A retained historical replay input is not the native current-format writer-output oracle: structural migration preserves request meaning but can produce a different event layout. Normalization preserves unexpected request-header fields, including `system`, so regressions remain visible. Versionless protocol-adapter unit fixtures remain outside the released Session format corpus. Fixtures in the [current writer format](../../../docs/session-format-status.md) use one row per event; retained v0/v1 fixtures may use canonical packed rows. The [temporary repository migrator](../../../scripts/migrate-packed-session-fixtures.ts) (`pnpm run migrate:packed-session-fixtures`) rewrites older historical layouts, and its [removal proposal](../../../.agents/notes/proposed/process/2026-07-26-remove-packed-session-fixture-migrator.md) owns its deletion.
 
diff --git a/packages/test-support/session-snapshot/README.zh.md b/packages/test-support/session-snapshot/README.zh.md
index 3d015bc2e9..05a7bc9876 100644
--- a/packages/test-support/session-snapshot/README.zh.md
+++ b/packages/test-support/session-snapshot/README.zh.md
@@ -68,7 +68,7 @@ defineAcpSnapshotSuite({
 })
 ```
 
-每个已记录 Session 目录携带封闭的 `snapshot.yml` manifest，以及规范 parent 与连续 child 角色。parent 文件名是 `session[.vN].jsonl`；child 是 `session.<ordinal>[.vN].jsonl`；v0 省略 `.v0`，正版本使用小写 `.vN`，且每个文件名与其 header 一致。一个角色可以保留旧 generation，但 harness 会选择数值最高的一项。拥有 fixture 的 manifest 可以声明 `sessionFormat.version` 与一个或多个封闭 `coverage` 名称，把该历史 generation 保留为显式迁移 fixture。未声明时，record 与 refresh 写入当前 generation；replay 也按[语料策略](../../../snapshots/AGENTS.md)接受保留的 V3 基线。manifest 还会指名场景、随附 profile、组合／header 类别、录制来源，以及已完成 Session 无法重建的 replay、平台、权限、环境、workspace 或输入事实。存储保护检查每个选定 parent 与 child 角色的工具结果和可移植路径。提示词／schema 擦除、消息身份及提示词先于请求的顺序检查适用于当前 generation；保留的前代维持其历史表示。适配器注册预期输出、Session 日志与可选 `workspace.expected/` 比较；保护会拒绝遗留目录、缺失角色、非规范名称、绝对路径、格式错误的 manifest 与平台专用分隔符。
+每个已记录 Session 目录携带封闭的 `snapshot.yml` manifest，以及规范 parent 与连续 child 角色。parent 文件名是 `session[.vN].jsonl`；child 是 `session.<ordinal>[.vN].jsonl`；v0 省略 `.v0`，正版本使用小写 `.vN`，且每个文件名与其 header 一致。一个角色可以保留旧 generation，但 harness 会选择数值最高的一项。拥有 fixture 的 manifest 可以声明 `sessionFormat.version` 与一个或多个封闭 `coverage` 名称，把该历史 generation 保留为显式迁移 fixture。未声明时，record 与 refresh 写入当前 generation；replay 按[语料策略](../../../snapshots/AGENTS.md)对每个 parent/child 角色独立接受保留的 V3 基线或当前 generation。显式声明 `sessionFormat.version` 时，每个选定角色都必须匹配该版本。manifest 还会指名场景、随附 profile、组合／header 类别、录制来源，以及已完成 Session 无法重建的 replay、平台、权限、环境、workspace 或输入事实。存储保护检查每个选定 parent 与 child 角色的工具结果和可移植路径。提示词／schema 擦除、消息身份及提示词先于请求的顺序检查适用于当前 generation；保留的前代维持其历史表示。适配器注册预期输出、Session 日志与可选 `workspace.expected/` 比较；保护会拒绝遗留目录、缺失角色、非规范名称、绝对路径、格式错误的 manifest 与平台专用分隔符。
 
 `normalizeSessionSnapshot` 在规范化路径并擦除系统提示文本与工具 schema 后，会保留完整 Session header 与事件 payload，但从已提交 fixture 中省略顶层 `seq`/`time` envelope；它还会规范化嵌入式 stream clock 与历史 packed-row 的 `seq0`/`time0` envelope 与 catalog child 创建时钟。事件顺序与来源事件引用保持不变。Replay 只在内存中合成顶层 envelope，而运行时持久化仍写入完整日志。多 Session 比较会先通过严格的构建期静态 Session 格式目录校验预期日志与收集日志，再进行身份脱敏与规范化；来源文件名不能改变格式校验。保留的历史 replay 输入不是原生当前格式 writer 输出的比较基准：结构迁移保留请求含义，但可以产生不同的事件布局。归一化保留意外的 request-header 字段（包括 `system`），使回归保持可见。无版本的协议适配器单元测试 fixture 不属于已发布 Session 格式语料。[当前写入器格式](../../../docs/session-format-status.zh.md)的 fixture 每个事件占一行；保留的 v0/v1 fixture 可以使用规范 packed row。[临时仓库迁移器](../../../scripts/migrate-packed-session-fixtures.ts)（`pnpm run migrate:packed-session-fixtures`）会改写更旧的历史布局，由其[移除提案](../../../.agents/notes/proposed/process/2026-07-26-remove-packed-session-fixture-migrator.zh.md)负责删除该迁移器。
 
diff --git a/scripts/session-snapshot-corpus-policy.spec.ts b/scripts/session-snapshot-corpus-policy.spec.ts
index d1f317db33..952213cbbb 100644
--- a/scripts/session-snapshot-corpus-policy.spec.ts
+++ b/scripts/session-snapshot-corpus-policy.spec.ts
@@ -39,6 +39,18 @@ describe('recorded-session corpus policy', () => {
       .toEqual({ currentRoles: 8, baselineRoles: 8, retainedRoles: 3, retainedScenarios: 3 })
   })
 
+  it.each([
+    [SESSION_FORMAT_VERSION, 3],
+    [3, SESSION_FORMAT_VERSION],
+  ])('counts baseline and current roles independently for parent v%i and child v%i', (parent, child) => {
+    expect(assertSnapshotCorpusPolicy([
+      current,
+      { key: 'sdk/mixed', selectedVersions: [parent, child] },
+      completeV0,
+      ...adjacent,
+    ])).toEqual({ currentRoles: 9, baselineRoles: 1, retainedRoles: 3, retainedScenarios: 3 })
+  })
+
   it('rejects refreshing away every direct V3 migration input', () => {
     expect(() => assertSnapshotCorpusPolicy([current, completeV0, ...adjacent]))
       .toThrow('Session corpus lacks v3 coverage: adjacent-migration')
@@ -85,15 +97,18 @@ describe('recorded-session corpus policy', () => {
     ])).toThrow('session/v0: v0 retained coverage must be multi-hop, packed-row, retry-failure, shipped-profile')
   })
 
-  it('rejects absent roles, undeclared history, and mixed selected generations', () => {
+  it('rejects absent roles, undeclared history, and mixed explicitly retained generations', () => {
     expect(() => assertSnapshotCorpusPolicy([{ key: 'session/empty', selectedVersions: [] }]))
       .toThrow('session/empty: scenario owns no selected Session role')
     expect(() => assertSnapshotCorpusPolicy([{ key: 'session/old', selectedVersions: [1] }]))
       .toThrow(`session/old: selected Session generation v1 must be retained baseline v3 or current v${SESSION_FORMAT_VERSION}`)
     expect(() => assertSnapshotCorpusPolicy([{ ...completeV0, selectedVersions: [0, SESSION_FORMAT_VERSION] }]))
       .toThrow(`session/v0: selected Session generation v${SESSION_FORMAT_VERSION} does not match expected v0`)
-    expect(() => assertSnapshotCorpusPolicy([{ ...baseline, selectedVersions: [3, SESSION_FORMAT_VERSION] }]))
-      .toThrow(`session/v3: selected Session generation v${SESSION_FORMAT_VERSION} does not match expected v3`)
+  })
+
+  it.each([2, SESSION_FORMAT_VERSION + 1])('rejects unsupported child generation %s', (version) => {
+    expect(() => assertSnapshotCorpusPolicy([{ key: 'sdk/invalid-child', selectedVersions: [3, version] }]))
+      .toThrow(`sdk/invalid-child: selected Session generation v${version} must be retained baseline v3 or current v${SESSION_FORMAT_VERSION}`)
   })
 
   it('rejects future unpinned generations', () => {
diff --git a/scripts/session-snapshot-corpus-policy.ts b/scripts/session-snapshot-corpus-policy.ts
index e10e35506a..590f4f7f8e 100644
--- a/scripts/session-snapshot-corpus-policy.ts
+++ b/scripts/session-snapshot-corpus-policy.ts
@@ -32,7 +32,7 @@ const REQUIRED_V0_COVERAGE = new Set([
 const REQUIRED_ADJACENT_COVERAGE = new Set(['adjacent-migration'])
 
 /**
- * Require a baseline/current majority and direct coverage of each historical migration source.
+ * Count baseline/current generations per role, require their majority, and preserve direct historical migration coverage.
  *
  * @param scenarios - Every owning top-level recorded-session scenario.
  * @returns Accepted current, baseline, and explicitly retained role counts.
@@ -47,29 +47,30 @@ export function assertSnapshotCorpusPolicy(
   const coverageByVersion = new Map<number, Set<string>>()
 
   for (const scenario of scenarios) {
-    const selectedVersion = scenario.selectedVersions[0]
-    if (selectedVersion === undefined) {
+    if (scenario.selectedVersions.length === 0) {
       throw new Error(`${scenario.key}: scenario owns no selected Session role`)
     }
-    const expectedVersion = scenario.retained?.version ?? selectedVersion
+    if (scenario.retained === undefined) {
+      for (const version of scenario.selectedVersions) {
+        if (version === RETAINED_BASELINE_VERSION) {
+          baselineRoles += 1
+        } else if (version === SESSION_FORMAT_VERSION) {
+          currentRoles += 1
+        } else {
+          throw new Error(
+            `${scenario.key}: selected Session generation v${version} must be retained baseline v${RETAINED_BASELINE_VERSION} or current v${SESSION_FORMAT_VERSION}`,
+          )
+        }
+      }
+      continue
+    }
+    const expectedVersion = scenario.retained.version
     const mismatched = scenario.selectedVersions.find(version => version !== expectedVersion)
     if (mismatched !== undefined) {
       throw new Error(
         `${scenario.key}: selected Session generation v${mismatched} does not match expected v${expectedVersion}`,
       )
     }
-    if (scenario.retained === undefined) {
-      if (selectedVersion === RETAINED_BASELINE_VERSION) {
-        baselineRoles += scenario.selectedVersions.length
-      } else if (selectedVersion === SESSION_FORMAT_VERSION) {
-        currentRoles += scenario.selectedVersions.length
-      } else {
-        throw new Error(
-          `${scenario.key}: selected Session generation v${selectedVersion} must be retained baseline v${RETAINED_BASELINE_VERSION} or current v${SESSION_FORMAT_VERSION}`,
-        )
-      }
-      continue
-    }
     const retiredTools = scenario.retained.coverage.length === 1 && scenario.retained.coverage[0] === 'retired-tools'
     if (!Number.isSafeInteger(scenario.retained.version)
       || scenario.retained.version < 0 || scenario.retained.version > SESSION_FORMAT_VERSION
diff --git a/snapshots/AGENTS.md b/snapshots/AGENTS.md
index 30f18834fd..644ddc9747 100644
--- a/snapshots/AGENTS.md
+++ b/snapshots/AGENTS.md
@@ -6,7 +6,7 @@ Every process under test starts through the `dsh` CLI with a shipped profile and
 
 Each scenario owns or explicitly references one primary Session role plus contiguous child roles. Canonical parent filenames are `session[.vN].jsonl`; children are `session.<ordinal>[.vN].jsonl`; v0 omits `.v0`, positive versions use lowercase `.vN`, and every filename agrees with its header. A directory may retain several generations of one role, but replay, record, and refresh select the numerically highest. Record and refresh write version-named outputs without renaming or deleting a committed generation; reviewed source-tree curation is separate. The owner alone records or refreshes the selected role. For an ordinary one-shot case, derive the user task and replay script from that selected JSONL; do not duplicate them in an `input.json`. Shared references are read-only, acyclic, point to the owner's selected parent generation, and are used only when another interface intentionally renders the same recorded behavior.
 
-An owner that must keep a historical generation or retired-tool recording declares its exact `sessionFormat.version` and closed migration `coverage` names in `snapshot.yml`; record and refresh never rewrite that Session fixture. `retired-tools` pins removed capabilities independently of migration coverage, including at the current format version. Owners without this declaration write current-writer output during record and refresh; replay accepts the retained V3 baseline or the current generation, with one selected generation per owner. The [corpus policy](../scripts/session-snapshot-corpus-policy.ts) requires V3 inputs for direct upgrade coverage and explicit V0–V2 migration coverage; a writer bump alone does not refresh fixtures.
+An owner that must keep a historical generation or retired-tool recording declares its exact `sessionFormat.version` and closed migration `coverage` names in `snapshot.yml`; record and refresh never rewrite that Session fixture. `retired-tools` pins removed capabilities independently of migration coverage, including at the current format version. Owners without this declaration write current-writer output during record and refresh; replay selects the retained V3 baseline or the current generation independently for each parent/child role. An explicit `sessionFormat.version` binds every selected role in that scenario. The [corpus policy](../scripts/session-snapshot-corpus-policy.ts) requires V3 inputs for direct upgrade coverage and explicit V0–V2 migration coverage; a writer bump alone does not refresh fixtures.
 
 Committed sessions are normalization fixed points. Replace volatile identities with typed relationship-preserving tokens, replace request system prompts and tool schemas with tokens, and keep exactly one readable sidecar owner per header class. Never redact arbitrary user or tool text merely because it resembles an identifier.
 
diff --git a/snapshots/sdk/subagent-activation-limit/session.1.v4.jsonl b/snapshots/sdk/subagent-activation-limit/session.1.v4.jsonl
deleted file mode 100644
index 92afbc1dd5..0000000000
--- a/snapshots/sdk/subagent-activation-limit/session.1.v4.jsonl
+++ /dev/null
@@ -1,18 +0,0 @@
-{"type":"session","version":4,"id":"{{session:2}}","createdAt":1789000001000,"cwd":"{{cwd}}","parentSession":"{{session:1}}","isSeeded":false,"origin":"subagent","delegationDepth":1}
-{"type":"subagent/descriptor","data":{"version":3,"mode":"continuable","provider":"spawn","label":"Reply CHILD_OK","agentProvider":"deepseek-official","agentModel":"deepseek-v4-flash"}}
-{"type":"sandbox/mode","data":{"mode":"danger-full-access","source":"delegation"}}
-{"type":"approval/policy","data":{"policy":"never","source":"delegation"}}
-{"type":"permission/preset","data":{"preset":"danger-full-access"}}
-{"type":"agent/inbox/spliced","data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"Reply with exactly CHILD_OK."},{"type":"text","text":"Your parent agent id is \"{{session:1}}\". Before you finish, send your result to that agent with send_message({ agent_id: \"{{session:1}}\", message: \"<self-contained result>\" }). The parent shares your workspace but does not automatically receive your transcript, tool output, or reasoning. Send earlier messages as well when a finding changes what the parent should do next; sending a message does not end your turn."}],"source":{"kind":"user"},"role":"user","id":"{{message:11}}"}]}}
-{"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":"system/message","data":{"turn":1,"step":1,"message":{"role":"system","content":[{"type":"text","text":"{{system}}"}],"source":{"kind":"system-prompt"},"id":"{{message:12}}"}},"surfaceOp":"append"}
-{"type":"user/message","data":{"content":[{"type":"text","text":"Reply with exactly CHILD_OK."},{"type":"text","text":"Your parent agent id is \"{{session:1}}\". Before you finish, send your result to that agent with send_message({ agent_id: \"{{session:1}}\", message: \"<self-contained result>\" }). The parent shares your workspace but does not automatically receive your transcript, tool output, or reasoning. Send earlier messages as well when a finding changes what the parent should do next; sending a message does not end your turn."}],"source":{"kind":"user"},"role":"user","id":"{{message:11}}"},"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`).\n\nYou are a delegated subagent: your permission scope was fixed when you were started and cannot be widened from inside this session — operations that require approval are rejected automatically. When the task needs access beyond that scope, do not retry the denied operation; state the limitation in your reply so the delegating agent can handle it."}],"source":{"kind":"runtime-context","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`)."},{"name":"subagent:delegation","text":"You are a delegated subagent: your permission scope was fixed when you were started and cannot be widened from inside this session — operations that require approval are rejected automatically. When the task needs access beyond that scope, do not retry the denied operation; state the limitation in your reply so the delegating agent can handle it."}]},"role":"user","id":"{{message:13}}"},"surfaceOp":"append"}
-{"type":"request/header","data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"tools":"{{tools}}"},"reason":"initial"}}
-{"type":"request/context","data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
-{"type":"session/title","data":{"title":"Reply with exactly CHILD_OK. Your","messageSeqs":[9],"source":{"kind":"fallback"}}}
-{"type":"assistant/message","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":"{{message:14}}"},"usage":{"inputTokens":10,"outputTokens":5},"stream":[{"type":"chunk","time":1789485622057,"chunk":{"type":"block-start","index":0,"blockType":"text"}},{"type":"text-chunks","time0":1789485622057,"index":0,"dt":[],"texts":["CHILD_OK"]},{"type":"chunk","time":1789485622057,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"CHILD_OK"}}},{"type":"chunk","time":1789485622058,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}},{"type":"chunk","time":1789485622058,"chunk":{"type":"finish","reason":{"kind":"stop"}}}]},"surfaceOp":"append"}
-{"type":"step/end","data":{"turn":1,"step":1}}
-{"type":"turn/end","data":{"turn":1,"reason":{"kind":"completed"}}}
diff --git a/snapshots/sdk/subagent-continuable-inheritance/session.1.v4.jsonl b/snapshots/sdk/subagent-continuable-inheritance/session.1.v4.jsonl
deleted file mode 100644
index eb3e536e58..0000000000
--- a/snapshots/sdk/subagent-continuable-inheritance/session.1.v4.jsonl
+++ /dev/null
@@ -1,17 +0,0 @@
-{"type":"session","version":4,"id":"{{session:2}}","createdAt":1789000001000,"cwd":"{{cwd}}","parentSession":"{{session:1}}","isSeeded":false,"origin":"subagent","delegationDepth":1}
-{"type":"subagent/descriptor","data":{"version":3,"mode":"continuable","provider":"spawn","label":"Reply with CHILD_OK","agentProvider":"deepseek-official","agentModel":"deepseek-v4-flash"}}
-{"type":"sandbox/mode","data":{"mode":"read-only","source":"delegation"}}
-{"type":"approval/policy","data":{"policy":"never","source":"delegation"}}
-{"type":"agent/inbox/spliced","data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"Reply with exactly the word CHILD_OK and nothing else."},{"type":"text","text":"Your parent agent id is \"{{session:1}}\". Before you finish, send your result to that agent with send_message({ agent_id: \"{{session:1}}\", message: \"<self-contained result>\" }). The parent shares your workspace but does not automatically receive your transcript, tool output, or reasoning. Send earlier messages as well when a finding changes what the parent should do next; sending a message does not end your turn."}],"source":{"kind":"user"},"role":"user","id":"{{message:8}}"}]}}
-{"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":"system/message","data":{"turn":1,"step":1,"message":{"role":"system","content":[{"type":"text","text":"{{system}}"}],"source":{"kind":"system-prompt"},"id":"{{message:9}}"}},"surfaceOp":"append"}
-{"type":"user/message","data":{"content":[{"type":"text","text":"Reply with exactly the word CHILD_OK and nothing else."},{"type":"text","text":"Your parent agent id is \"{{session:1}}\". Before you finish, send your result to that agent with send_message({ agent_id: \"{{session:1}}\", message: \"<self-contained result>\" }). The parent shares your workspace but does not automatically receive your transcript, tool output, or reasoning. Send earlier messages as well when a finding changes what the parent should do next; sending a message does not end your turn."}],"source":{"kind":"user"},"role":"user","id":"{{message:8}}"},"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: read-only. Any available operation enforced by the DSH file sandbox cannot modify files in the standing mode. Do not refuse a required modification from this policy alone: try an available tool normally and follow any denial and escalation guidance it returns.\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`).\n\nYou are a delegated subagent: your permission scope was fixed when you were started and cannot be widened from inside this session — operations that require approval are rejected automatically. When the task needs access beyond that scope, do not retry the denied operation; state the limitation in your reply so the delegating agent can handle it."}],"source":{"kind":"runtime-context","form":"snapshot","sections":[{"name":"sandbox:policy","text":"Current DSH file policy: read-only. Any available operation enforced by the DSH file sandbox cannot modify files in the standing mode. Do not refuse a required modification from this policy alone: try an available tool normally and follow any denial and escalation guidance it returns."},{"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`)."},{"name":"subagent:delegation","text":"You are a delegated subagent: your permission scope was fixed when you were started and cannot be widened from inside this session — operations that require approval are rejected automatically. When the task needs access beyond that scope, do not retry the denied operation; state the limitation in your reply so the delegating agent can handle it."}]},"role":"user","id":"{{message:10}}"},"surfaceOp":"append"}
-{"type":"request/header","data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"tools":"{{tools}}"},"reason":"initial"}}
-{"type":"request/context","data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
-{"type":"session/title","data":{"title":"Reply with exactly the word","messageSeqs":[8],"source":{"kind":"fallback"}}}
-{"type":"assistant/message","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":"{{message:11}}"},"usage":{"inputTokens":10,"outputTokens":5},"stream":[{"type":"chunk","time":1788699459507,"chunk":{"type":"block-start","index":0,"blockType":"text"}},{"type":"text-chunks","time0":1788699459507,"index":0,"dt":[],"texts":["CHILD_OK"]},{"type":"chunk","time":1788699459507,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"CHILD_OK"}}},{"type":"chunk","time":1788699459507,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}},{"type":"chunk","time":1788699459507,"chunk":{"type":"finish","reason":{"kind":"stop"}}}]},"surfaceOp":"append"}
-{"type":"step/end","data":{"turn":1,"step":1}}
-{"type":"turn/end","data":{"turn":1,"reason":{"kind":"completed"}}}
diff --git a/snapshots/sdk/subagent-continuable/session.1.v4.jsonl b/snapshots/sdk/subagent-continuable/session.1.v4.jsonl
deleted file mode 100644
index 29bf8f0354..0000000000
--- a/snapshots/sdk/subagent-continuable/session.1.v4.jsonl
+++ /dev/null
@@ -1,28 +0,0 @@
-{"type":"session","version":4,"id":"{{session:2}}","createdAt":1789000001000,"cwd":"{{cwd}}","parentSession":"{{session:1}}","isSeeded":false,"origin":"subagent","delegationDepth":1}
-{"type":"subagent/descriptor","data":{"version":3,"mode":"continuable","provider":"spawn","label":"Reply with CHILD_OK","agentProvider":"deepseek-official","agentModel":"deepseek-v4-flash"}}
-{"type":"sandbox/mode","data":{"mode":"danger-full-access","source":"delegation"}}
-{"type":"approval/policy","data":{"policy":"never","source":"delegation"}}
-{"type":"permission/preset","data":{"preset":"danger-full-access"}}
-{"type":"agent/inbox/spliced","data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"Reply with exactly the word CHILD_OK and nothing else."},{"type":"text","text":"Your parent agent id is \"{{session:1}}\". Before you finish, send your result to that agent with send_message({ agent_id: \"{{session:1}}\", message: \"<self-contained result>\" }). The parent shares your workspace but does not automatically receive your transcript, tool output, or reasoning. Send earlier messages as well when a finding changes what the parent should do next; sending a message does not end your turn."}],"source":{"kind":"user"},"role":"user","id":"{{message:15}}"}]}}
-{"type":"turn/start","data":{"turn":1}}
-{"type":"agent/inbox/spliced","data":{"target":"next-turn","start":0,"removedCount":1,"inserted":[]}}
-{"type":"agent/inbox/spliced","data":{"target":"next-step","start":0,"inserted":[{"content":[{"type":"text","text":"Agent {{session:1}} sent a message: "},{"type":"text","text":"Now reply with exactly SECOND_OK."}],"source":{"kind":"agent-message","form":"relay","senderSessionId":"{{session:1}}"},"role":"user","id":"{{message:16}}"}]}}
-{"type":"agent/inbox/spliced","data":{"target":"next-step","start":1,"inserted":[{"content":[{"type":"text","text":"Agent {{session:1}} sent a message: "},{"type":"text","text":"Now reply with exactly THIRD_OK."}],"source":{"kind":"agent-message","form":"relay","senderSessionId":"{{session:1}}"},"role":"user","id":"{{message:17}}"}]}}
-{"type":"agent/inbox/spliced","data":{"target":"next-step","start":2,"inserted":[{"content":[{"type":"text","text":"Human priority: keep the requested exact reply."}],"source":{"kind":"user","rpcId":"{{rpc:1}}"},"role":"user","id":"{{message:18}}"}]}}
-{"type":"step/start","data":{"turn":1,"step":1}}
-{"type":"system/message","data":{"turn":1,"step":1,"message":{"role":"system","content":[{"type":"text","text":"{{system}}"}],"source":{"kind":"system-prompt"},"id":"{{message:19}}"}},"surfaceOp":"append"}
-{"type":"user/message","data":{"content":[{"type":"text","text":"Reply with exactly the word CHILD_OK and nothing else."},{"type":"text","text":"Your parent agent id is \"{{session:1}}\". Before you finish, send your result to that agent with send_message({ agent_id: \"{{session:1}}\", message: \"<self-contained result>\" }). The parent shares your workspace but does not automatically receive your transcript, tool output, or reasoning. Send earlier messages as well when a finding changes what the parent should do next; sending a message does not end your turn."}],"source":{"kind":"user"},"role":"user","id":"{{message:15}}"},"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`).\n\nYou are a delegated subagent: your permission scope was fixed when you were started and cannot be widened from inside this session — operations that require approval are rejected automatically. When the task needs access beyond that scope, do not retry the denied operation; state the limitation in your reply so the delegating agent can handle it."}],"source":{"kind":"runtime-context","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`)."},{"name":"subagent:delegation","text":"You are a delegated subagent: your permission scope was fixed when you were started and cannot be widened from inside this session — operations that require approval are rejected automatically. When the task needs access beyond that scope, do not retry the denied operation; state the limitation in your reply so the delegating agent can handle it."}]},"role":"user","id":"{{message:20}}"},"surfaceOp":"append"}
-{"type":"request/header","data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"tools":"{{tools}}"},"reason":"initial"}}
-{"type":"request/context","data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
-{"type":"session/title","data":{"title":"Reply with exactly the word","messageSeqs":[12],"source":{"kind":"fallback"}}}
-{"type":"assistant/message","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":"{{message:21}}"},"usage":{"inputTokens":10,"outputTokens":5},"stream":[{"type":"chunk","time":1788767375175,"chunk":{"type":"block-start","index":0,"blockType":"text"}},{"type":"text-chunks","time0":1788767375175,"index":0,"dt":[],"texts":["CHILD_OK"]},{"type":"chunk","time":1788767375175,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"CHILD_OK"}}},{"type":"chunk","time":1788767375175,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}},{"type":"chunk","time":1788767375175,"chunk":{"type":"finish","reason":{"kind":"stop"}}}]},"surfaceOp":"append"}
-{"type":"step/end","data":{"turn":1,"step":1}}
-{"type":"agent/inbox/spliced","data":{"target":"next-step","start":0,"removedCount":3,"inserted":[]}}
-{"type":"step/start","data":{"turn":1,"step":2}}
-{"type":"user/message","data":{"content":[{"type":"text","text":"Agent {{session:1}} sent a message: "},{"type":"text","text":"Now reply with exactly SECOND_OK."}],"source":{"kind":"agent-message","form":"relay","senderSessionId":"{{session:1}}"},"role":"user","id":"{{message:16}}"},"surfaceOp":"append"}
-{"type":"user/message","data":{"content":[{"type":"text","text":"Agent {{session:1}} sent a message: "},{"type":"text","text":"Now reply with exactly THIRD_OK."}],"source":{"kind":"agent-message","form":"relay","senderSessionId":"{{session:1}}"},"role":"user","id":"{{message:17}}"},"surfaceOp":"append"}
-{"type":"user/message","data":{"content":[{"type":"text","text":"Human priority: keep the requested exact reply."}],"source":{"kind":"user","rpcId":"{{rpc:1}}"},"role":"user","id":"{{message:18}}"},"surfaceOp":"append"}
-{"type":"assistant/message","data":{"turn":1,"step":2,"message":{"role":"assistant","content":[{"type":"reasoning","text":"I will return the requested exact reply."},{"type":"text","text":"SECOND_OK"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"{{message:22}}"},"usage":{"inputTokens":10,"outputTokens":5},"stream":[{"type":"chunk","time":1788767375189,"chunk":{"type":"block-start","index":0,"blockType":"reasoning"}},{"type":"reasoning-chunks","time0":1788767375189,"index":0,"dt":[],"texts":["I will return the requested exact reply."]},{"type":"chunk","time":1788767375189,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"I will return the requested exact reply."}}},{"type":"chunk","time":1788767375189,"chunk":{"type":"block-start","index":1,"blockType":"text"}},{"type":"text-chunks","time0":1788767375190,"index":1,"dt":[],"texts":["SECOND_OK"]},{"type":"chunk","time":1788767375190,"chunk":{"type":"block-end","index":1,"block":{"type":"text","text":"SECOND_OK"}}},{"type":"chunk","time":1788767375190,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}},{"type":"chunk","time":1788767375190,"chunk":{"type":"finish","reason":{"kind":"stop"}}}]},"surfaceOp":"append"}
-{"type":"step/end","data":{"turn":1,"step":2}}
-{"type":"turn/end","data":{"turn":1,"reason":{"kind":"completed"}}}
diff --git a/snapshots/sdk/subagent-list-agents/session.1.v4.jsonl b/snapshots/sdk/subagent-list-agents/session.1.v4.jsonl
deleted file mode 100644
index 1d741c640f..0000000000
--- a/snapshots/sdk/subagent-list-agents/session.1.v4.jsonl
+++ /dev/null
@@ -1,18 +0,0 @@
-{"type":"session","version":4,"id":"{{session:2}}","createdAt":1789000001000,"cwd":"{{cwd}}","parentSession":"{{session:1}}","isSeeded":false,"origin":"subagent","delegationDepth":1}
-{"type":"subagent/descriptor","data":{"version":3,"mode":"continuable","provider":"spawn","label":"Reply with CHILD_OK","agentProvider":"deepseek-official","agentModel":"deepseek-v4-flash"}}
-{"type":"sandbox/mode","data":{"mode":"danger-full-access","source":"delegation"}}
-{"type":"approval/policy","data":{"policy":"never","source":"delegation"}}
-{"type":"permission/preset","data":{"preset":"danger-full-access"}}
-{"type":"agent/inbox/spliced","data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"Reply with exactly the word CHILD_OK and nothing else."},{"type":"text","text":"Your parent agent id is \"{{session:1}}\". Before you finish, send your result to that agent with send_message({ agent_id: \"{{session:1}}\", message: \"<self-contained result>\" }). The parent shares your workspace but does not automatically receive your transcript, tool output, or reasoning. Send earlier messages as well when a finding changes what the parent should do next; sending a message does not end your turn."}],"source":{"kind":"user"},"role":"user","id":"{{message:13}}"}]}}
-{"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":"system/message","data":{"turn":1,"step":1,"message":{"role":"system","content":[{"type":"text","text":"{{system}}"}],"source":{"kind":"system-prompt"},"id":"{{message:14}}"}},"surfaceOp":"append"}
-{"type":"user/message","data":{"content":[{"type":"text","text":"Reply with exactly the word CHILD_OK and nothing else."},{"type":"text","text":"Your parent agent id is \"{{session:1}}\". Before you finish, send your result to that agent with send_message({ agent_id: \"{{session:1}}\", message: \"<self-contained result>\" }). The parent shares your workspace but does not automatically receive your transcript, tool output, or reasoning. Send earlier messages as well when a finding changes what the parent should do next; sending a message does not end your turn."}],"source":{"kind":"user"},"role":"user","id":"{{message:13}}"},"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`).\n\nYou are a delegated subagent: your permission scope was fixed when you were started and cannot be widened from inside this session — operations that require approval are rejected automatically. When the task needs access beyond that scope, do not retry the denied operation; state the limitation in your reply so the delegating agent can handle it."}],"source":{"kind":"runtime-context","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`)."},{"name":"subagent:delegation","text":"You are a delegated subagent: your permission scope was fixed when you were started and cannot be widened from inside this session — operations that require approval are rejected automatically. When the task needs access beyond that scope, do not retry the denied operation; state the limitation in your reply so the delegating agent can handle it."}]},"role":"user","id":"{{message:15}}"},"surfaceOp":"append"}
-{"type":"request/header","data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"tools":"{{tools}}"},"reason":"initial"}}
-{"type":"request/context","data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
-{"type":"session/title","data":{"title":"Reply with exactly the word","messageSeqs":[9],"source":{"kind":"fallback"}}}
-{"type":"assistant/message","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":"{{message:16}}"},"usage":{"inputTokens":10,"outputTokens":3},"stream":[{"type":"chunk","time":1788699463914,"chunk":{"type":"block-start","index":0,"blockType":"text"}},{"type":"text-chunks","time0":1788699463914,"index":0,"dt":[],"texts":["CHILD_OK"]},{"type":"chunk","time":1788699463915,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"CHILD_OK"}}},{"type":"chunk","time":1788699463915,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":3}}},{"type":"chunk","time":1788699463915,"chunk":{"type":"finish","reason":{"kind":"stop"}}}]},"surfaceOp":"append"}
-{"type":"step/end","data":{"turn":1,"step":1}}
-{"type":"turn/end","data":{"turn":1,"reason":{"kind":"completed"}}}
diff --git a/snapshots/sdk/subagent-send-message/session.1.v4.jsonl b/snapshots/sdk/subagent-send-message/session.1.v4.jsonl
deleted file mode 100644
index 49e1e98669..0000000000
--- a/snapshots/sdk/subagent-send-message/session.1.v4.jsonl
+++ /dev/null
@@ -1,23 +0,0 @@
-{"type":"session","version":4,"id":"{{session:2}}","createdAt":1789000001000,"cwd":"{{cwd}}","parentSession":"{{session:1}}","isSeeded":false,"origin":"subagent","delegationDepth":1}
-{"type":"subagent/descriptor","data":{"version":3,"mode":"continuable","provider":"spawn","label":"Send a finding","agentProvider":"deepseek-official","agentModel":"deepseek-v4-flash"}}
-{"type":"sandbox/mode","data":{"mode":"danger-full-access","source":"delegation"}}
-{"type":"approval/policy","data":{"policy":"never","source":"delegation"}}
-{"type":"permission/preset","data":{"preset":"danger-full-access"}}
-{"type":"agent/inbox/spliced","data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"Send exactly CHILD_MESSAGE_OK to your parent with send_message, then stop."},{"type":"text","text":"Your parent agent id is \"{{session:1}}\". Before you finish, send your result to that agent with send_message({ agent_id: \"{{session:1}}\", message: \"<self-contained result>\" }). The parent shares your workspace but does not automatically receive your transcript, tool output, or reasoning. Send earlier messages as well when a finding changes what the parent should do next; sending a message does not end your turn."}],"source":{"kind":"user"},"role":"user","id":"{{message:12}}"}]}}
-{"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":"system/message","data":{"turn":1,"step":1,"message":{"role":"system","content":[{"type":"text","text":"{{system}}"}],"source":{"kind":"system-prompt"},"id":"{{message:13}}"}},"surfaceOp":"append"}
-{"type":"user/message","data":{"content":[{"type":"text","text":"Send exactly CHILD_MESSAGE_OK to your parent with send_message, then stop."},{"type":"text","text":"Your parent agent id is \"{{session:1}}\". Before you finish, send your result to that agent with send_message({ agent_id: \"{{session:1}}\", message: \"<self-contained result>\" }). The parent shares your workspace but does not automatically receive your transcript, tool output, or reasoning. Send earlier messages as well when a finding changes what the parent should do next; sending a message does not end your turn."}],"source":{"kind":"user"},"role":"user","id":"{{message:12}}"},"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`).\n\nYou are a delegated subagent: your permission scope was fixed when you were started and cannot be widened from inside this session — operations that require approval are rejected automatically. When the task needs access beyond that scope, do not retry the denied operation; state the limitation in your reply so the delegating agent can handle it."}],"source":{"kind":"runtime-context","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`)."},{"name":"subagent:delegation","text":"You are a delegated subagent: your permission scope was fixed when you were started and cannot be widened from inside this session — operations that require approval are rejected automatically. When the task needs access beyond that scope, do not retry the denied operation; state the limitation in your reply so the delegating agent can handle it."}]},"role":"user","id":"{{message:14}}"},"surfaceOp":"append"}
-{"type":"request/header","data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"tools":"{{tools}}"},"reason":"initial"}}
-{"type":"request/context","data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
-{"type":"session/title","data":{"title":"Send exactly CHILD_MESSAGE_OK to your","messageSeqs":[9],"source":{"kind":"fallback"}}}
-{"type":"assistant/message","data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"tool-call","id":"call_send_message_1","name":"send_message","arguments":"{\"agent_id\": \"{{session:1}}\", \"message\": \"CHILD_MESSAGE_OK\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"{{message:15}}"},"usage":{"inputTokens":10,"outputTokens":5},"stream":[{"type":"chunk","time":1788699465535,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}},{"type":"tool-call-chunks","time0":1788699465535,"index":0,"dt":[],"id":"call_send_message_1","name":"send_message","args":["{\"agent_id\": \"{{session:1}}\", \"message\": \"CHILD_MESSAGE_OK\"}"]},{"type":"chunk","time":1788699465535,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"call_send_message_1","name":"send_message","arguments":"{\"agent_id\": \"{{session:1}}\", \"message\": \"CHILD_MESSAGE_OK\"}"}}},{"type":"chunk","time":1788699465535,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}},{"type":"chunk","time":1788699465535,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}]},"surfaceOp":"append"}
-{"type":"tool/call","data":{"turn":1,"step":1,"callId":"call_send_message_1","name":"send_message","arguments":"{\"agent_id\": \"{{session:1}}\", \"message\": \"CHILD_MESSAGE_OK\"}"}}
-{"type":"tool/result","data":{"turn":1,"step":1,"message":{"role":"tool","source":{"kind":"tool","callId":"call_send_message_1"},"toolCallId":"call_send_message_1","content":[{"type":"text","text":"message delivered to agent {{session:1}}"}],"isError":false,"id":"{{message:16}}"}},"sourceEventSeqs":[15],"surfaceOp":"append"}
-{"type":"step/end","data":{"turn":1,"step":1}}
-{"type":"step/start","data":{"turn":1,"step":2}}
-{"type":"assistant/message","data":{"turn":1,"step":2,"message":{"role":"assistant","content":[{"type":"text","text":"Message sent."}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"{{message:17}}"},"usage":{"inputTokens":10,"outputTokens":5},"stream":[{"type":"chunk","time":1788699465557,"chunk":{"type":"block-start","index":0,"blockType":"text"}},{"type":"text-chunks","time0":1788699465557,"index":0,"dt":[],"texts":["Message sent."]},{"type":"chunk","time":1788699465557,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"Message sent."}}},{"type":"chunk","time":1788699465557,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}},{"type":"chunk","time":1788699465557,"chunk":{"type":"finish","reason":{"kind":"stop"}}}]},"surfaceOp":"append"}
-{"type":"step/end","data":{"turn":1,"step":2}}
-{"type":"turn/end","data":{"turn":1,"reason":{"kind":"completed"}}}