Merge refreshed docs/i18n-batch-cds-postmortem into docs/i18n-batch-rfc
# Conflicts: # .agents/notes/implemented/architecture/2026-06-11-content-block-vocabulary.i18n.yaml # .agents/notes/implemented/architecture/2026-06-11-content-block-vocabulary.zh.md # .agents/notes/implemented/architecture/2026-06-11-custom-schema-dsl.i18n.yaml # .agents/notes/implemented/architecture/2026-06-11-custom-schema-dsl.zh.md # .agents/notes/implemented/architecture/2026-06-11-dev-invariants-over-deep-readonly.i18n.yaml # .agents/notes/implemented/architecture/2026-06-11-dev-invariants-over-deep-readonly.zh.md # .agents/notes/implemented/architecture/2026-06-11-event-sourced-sessions.i18n.yaml # .agents/notes/implemented/architecture/2026-06-11-event-sourced-sessions.zh.md # .agents/notes/implemented/architecture/2026-06-11-microkernel-event-taxonomy.i18n.yaml # .agents/notes/implemented/architecture/2026-06-11-microkernel-event-taxonomy.zh.md # .agents/notes/implemented/architecture/2026-06-11-runtime-arg-validation.i18n.yaml # .agents/notes/implemented/architecture/2026-06-11-runtime-arg-validation.zh.md # .agents/notes/implemented/architecture/2026-06-11-structured-error-taxonomy.i18n.yaml # .agents/notes/implemented/architecture/2026-06-11-structured-error-taxonomy.zh.md # .agents/notes/implemented/architecture/2026-06-11-tool-schemas-in-prompt-assembly.i18n.yaml # .agents/notes/implemented/architecture/2026-06-11-tool-schemas-in-prompt-assembly.zh.md # .agents/notes/implemented/architecture/2026-06-13-capability-seams.i18n.yaml # .agents/notes/implemented/architecture/2026-06-13-capability-seams.zh.md # .agents/notes/implemented/architecture/2026-06-13-twin-llm-adapters.i18n.yaml # .agents/notes/implemented/architecture/2026-06-13-twin-llm-adapters.zh.md # .agents/notes/implemented/architecture/2026-06-14-session-persistence.i18n.yaml # .agents/notes/implemented/architecture/2026-06-14-session-persistence.zh.md # .agents/notes/implemented/architecture/2026-06-15-turn-enclosure-invariant.i18n.yaml # .agents/notes/implemented/architecture/2026-06-15-turn-enclosure-invariant.zh.md # .agents/notes/implemented/architecture/2026-06-17-filesystem-capability-seam.i18n.yaml # .agents/notes/implemented/architecture/2026-06-17-filesystem-capability-seam.zh.md # .agents/notes/implemented/architecture/2026-06-18-agent-lifecycle-and-ownership-seams.i18n.yaml # .agents/notes/implemented/architecture/2026-06-18-agent-lifecycle-and-ownership-seams.zh.md # .agents/notes/implemented/architecture/2026-06-18-session-surface.i18n.yaml # .agents/notes/implemented/architecture/2026-06-18-session-surface.zh.md # .agents/notes/implemented/architecture/2026-06-18-shared-persistence-write-coordinator.i18n.yaml # .agents/notes/implemented/architecture/2026-06-18-shared-persistence-write-coordinator.zh.md # .agents/notes/implemented/architecture/2026-06-20-branded-ids.i18n.yaml # .agents/notes/implemented/architecture/2026-06-20-branded-ids.zh.md # .agents/notes/implemented/architecture/2026-06-20-extract-example-app-packages.i18n.yaml # .agents/notes/implemented/architecture/2026-06-20-extract-example-app-packages.zh.md # .agents/notes/implemented/architecture/2026-06-20-package-hierarchy.i18n.yaml # .agents/notes/implemented/architecture/2026-06-20-package-hierarchy.md # .agents/notes/implemented/architecture/2026-06-20-package-hierarchy.zh.md # .agents/notes/implemented/architecture/2026-06-21-mandatory-app-attribution-headers.i18n.yaml # .agents/notes/implemented/architecture/2026-06-21-mandatory-app-attribution-headers.zh.md # .agents/notes/implemented/architecture/2026-06-24-web-capability-seam.i18n.yaml # .agents/notes/implemented/architecture/2026-06-24-web-capability-seam.zh.md # .agents/notes/implemented/architecture/2026-06-26-file-context-as-event-gate.i18n.yaml # .agents/notes/implemented/architecture/2026-06-26-file-context-as-event-gate.zh.md # .agents/notes/implemented/architecture/2026-06-30-bash-stdin-env-trusted-plugin-surface.i18n.yaml # .agents/notes/implemented/architecture/2026-06-30-bash-stdin-env-trusted-plugin-surface.zh.md # .agents/notes/implemented/architecture/2026-06-30-event-domain-semantics.i18n.yaml # .agents/notes/implemented/architecture/2026-06-30-event-domain-semantics.zh.md # .agents/notes/implemented/architecture/2026-07-02-fs-per-session-cwd.i18n.yaml # .agents/notes/implemented/architecture/2026-07-02-fs-per-session-cwd.zh.md # .agents/notes/implemented/architecture/2026-07-02-result-time-applied-hunk-diffs.i18n.yaml # .agents/notes/implemented/architecture/2026-07-02-result-time-applied-hunk-diffs.zh.md # .agents/notes/implemented/architecture/2026-07-02-tool-render-intent-union.i18n.yaml # .agents/notes/implemented/architecture/2026-07-02-tool-render-intent-union.zh.md # .agents/notes/implemented/architecture/2026-07-03-filesystem-directory-listing-seam.i18n.yaml # .agents/notes/implemented/architecture/2026-07-03-filesystem-directory-listing-seam.zh.md # .agents/notes/implemented/architecture/2026-07-05-prompt-variables-and-tool-guidance-ownership.i18n.yaml # .agents/notes/implemented/architecture/2026-07-05-prompt-variables-and-tool-guidance-ownership.zh.md # .agents/notes/implemented/architecture/2026-07-05-reconstructable-requests.i18n.yaml # .agents/notes/implemented/architecture/2026-07-05-reconstructable-requests.zh.md # .agents/notes/implemented/architecture/2026-07-05-subagent-provider-lifecycle-events.i18n.yaml # .agents/notes/implemented/architecture/2026-07-05-subagent-provider-lifecycle-events.zh.md # .agents/notes/implemented/architecture/2026-07-06-timeout-deadline-library.i18n.yaml # .agents/notes/implemented/architecture/2026-07-06-timeout-deadline-library.zh.md # .agents/notes/implemented/architecture/2026-07-07-tool-call-timeout-policy.i18n.yaml # .agents/notes/implemented/architecture/2026-07-07-tool-call-timeout-policy.zh.md # .agents/notes/implemented/architecture/2026-07-08-agent-scope-contexts.i18n.yaml # .agents/notes/implemented/architecture/2026-07-08-agent-scope-contexts.zh.md # .agents/notes/implemented/architecture/2026-07-12-agent-scope-runtime-design.i18n.yaml # .agents/notes/implemented/architecture/2026-07-12-agent-scope-runtime-design.zh.md # .agents/notes/implemented/feature/2026-06-14-acp-agent-client-protocol.i18n.yaml # .agents/notes/implemented/feature/2026-06-14-acp-agent-client-protocol.zh.md # .agents/notes/implemented/feature/2026-06-14-acp-multi-session.i18n.yaml # .agents/notes/implemented/feature/2026-06-14-acp-multi-session.zh.md # .agents/notes/implemented/feature/2026-06-15-code-mode.i18n.yaml # .agents/notes/implemented/feature/2026-06-15-code-mode.zh.md # .agents/notes/implemented/feature/2026-06-17-filesystem-tool-schemas.i18n.yaml # .agents/notes/implemented/feature/2026-06-17-filesystem-tool-schemas.zh.md # .agents/notes/implemented/feature/2026-06-18-acp-terminal-and-tool-rendering.i18n.yaml # .agents/notes/implemented/feature/2026-06-18-acp-terminal-and-tool-rendering.zh.md # .agents/notes/implemented/feature/2026-06-18-compaction-capability-seam.i18n.yaml # .agents/notes/implemented/feature/2026-06-18-compaction-capability-seam.zh.md # .agents/notes/implemented/feature/2026-06-21-subagent-capability-seam.i18n.yaml # .agents/notes/implemented/feature/2026-06-21-subagent-capability-seam.md # .agents/notes/implemented/feature/2026-06-21-subagent-capability-seam.zh.md # .agents/notes/implemented/feature/2026-06-22-acp-subagent-backend.i18n.yaml # .agents/notes/implemented/feature/2026-06-22-acp-subagent-backend.zh.md # .agents/notes/implemented/feature/2026-06-25-ask-user-question.i18n.yaml # .agents/notes/implemented/feature/2026-06-25-ask-user-question.zh.md # .agents/notes/implemented/feature/2026-06-29-todo-write-tool.i18n.yaml # .agents/notes/implemented/feature/2026-06-29-todo-write-tool.zh.md # .agents/notes/implemented/feature/2026-06-30-hook-bridges.i18n.yaml # .agents/notes/implemented/feature/2026-06-30-hook-bridges.zh.md # .agents/notes/implemented/feature/2026-06-30-hook-protocol-lib.i18n.yaml # .agents/notes/implemented/feature/2026-06-30-hook-protocol-lib.zh.md # .agents/notes/implemented/feature/2026-06-30-interception-seams.i18n.yaml # .agents/notes/implemented/feature/2026-06-30-interception-seams.zh.md # .agents/notes/implemented/feature/2026-06-30-session-store-fork-api.i18n.yaml # .agents/notes/implemented/feature/2026-06-30-session-store-fork-api.zh.md # .agents/notes/implemented/feature/2026-06-30-subagent-observe-enrich.i18n.yaml # .agents/notes/implemented/feature/2026-06-30-subagent-observe-enrich.zh.md # .agents/notes/implemented/feature/2026-07-05-dynamic-workflows.i18n.yaml # .agents/notes/implemented/feature/2026-07-05-dynamic-workflows.zh.md # .agents/notes/implemented/feature/2026-07-05-skill-system.i18n.yaml # .agents/notes/implemented/feature/2026-07-05-skill-system.zh.md # .agents/notes/implemented/feature/2026-07-06-approval-seam.i18n.yaml # .agents/notes/implemented/feature/2026-07-06-approval-seam.zh.md # .agents/notes/implemented/feature/2026-07-06-explicit-tool-order.i18n.yaml # .agents/notes/implemented/feature/2026-07-06-explicit-tool-order.zh.md # .agents/notes/implemented/feature/2026-07-06-sandbox.i18n.yaml # .agents/notes/implemented/feature/2026-07-06-sandbox.zh.md # .agents/notes/implemented/feature/2026-07-07-mcp-client-plugin.i18n.yaml # .agents/notes/implemented/feature/2026-07-07-mcp-client-plugin.zh.md # .agents/notes/implemented/feature/2026-07-07-session-prefix.i18n.yaml # .agents/notes/implemented/feature/2026-07-07-session-prefix.zh.md # .agents/notes/implemented/feature/2026-07-08-repeat-tool-guard.i18n.yaml # .agents/notes/implemented/feature/2026-07-08-repeat-tool-guard.zh.md # .agents/notes/implemented/feature/2026-07-08-self-referential-cordis-toolset.i18n.yaml # .agents/notes/implemented/feature/2026-07-08-self-referential-cordis-toolset.zh.md # .agents/notes/implemented/feature/2026-07-10-session-query-service.i18n.yaml # .agents/notes/implemented/feature/2026-07-10-session-query-service.zh.md # .agents/notes/implemented/feature/2026-07-12-subagent-persona-tool-filter-and-depth.i18n.yaml # .agents/notes/implemented/feature/2026-07-12-subagent-persona-tool-filter-and-depth.zh.md # .agents/notes/implemented/process/2026-06-11-doc-sync-enforcement.i18n.yaml # .agents/notes/implemented/process/2026-06-11-doc-sync-enforcement.zh.md # .agents/notes/implemented/process/2026-06-11-quality-gates.i18n.yaml # .agents/notes/implemented/process/2026-06-11-quality-gates.md # .agents/notes/implemented/process/2026-06-11-quality-gates.zh.md # .agents/notes/implemented/process/2026-06-11-tsdown-over-dumble.i18n.yaml # .agents/notes/implemented/process/2026-06-11-tsdown-over-dumble.zh.md # .agents/notes/implemented/process/2026-06-11-vendor-cordis-as-source.i18n.yaml # .agents/notes/implemented/process/2026-06-11-vendor-cordis-as-source.zh.md # .agents/notes/implemented/process/2026-06-16-pnpm-over-yarn.i18n.yaml # .agents/notes/implemented/process/2026-06-16-pnpm-over-yarn.zh.md # .agents/notes/implemented/process/2026-06-17-ts-build-config.i18n.yaml # .agents/notes/implemented/process/2026-06-17-ts-build-config.zh.md # .agents/notes/implemented/process/2026-06-18-markdown-cross-link-lint.i18n.yaml # .agents/notes/implemented/process/2026-06-18-markdown-cross-link-lint.zh.md # .agents/notes/implemented/process/2026-06-20-core-data-structures-catalog.i18n.yaml # .agents/notes/implemented/process/2026-06-20-core-data-structures-catalog.zh.md # .agents/notes/implemented/process/2026-06-20-generated-cordis-catalog.i18n.yaml # .agents/notes/implemented/process/2026-06-20-generated-cordis-catalog.zh.md # .agents/notes/implemented/process/2026-06-20-rfc-classification.i18n.yaml # .agents/notes/implemented/process/2026-06-20-rfc-classification.zh.md # .agents/notes/implemented/process/2026-07-02-tool-schema-catalog.i18n.yaml # .agents/notes/implemented/process/2026-07-02-tool-schema-catalog.zh.md # .agents/notes/implemented/process/2026-07-03-documentation-graph-atlas.i18n.yaml # .agents/notes/implemented/process/2026-07-03-documentation-graph-atlas.zh.md # .agents/notes/implemented/process/2026-07-04-cordis-jsdoc-completeness-gate.i18n.yaml # .agents/notes/implemented/process/2026-07-04-cordis-jsdoc-completeness-gate.zh.md # .agents/notes/implemented/process/2026-07-04-doc-tiers-and-budgets.i18n.yaml # .agents/notes/implemented/process/2026-07-04-doc-tiers-and-budgets.zh.md # .agents/notes/implemented/process/2026-07-04-generate-rfc-index-tables.i18n.yaml # 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.agents/notes/proposed/feature/2026-07-13-stream-workflow-progress-through-tool-calls.i18n.yaml # .agents/notes/proposed/feature/2026-07-13-stream-workflow-progress-through-tool-calls.zh.md # .agents/notes/proposed/process/2026-06-11-api-extractor-reports.i18n.yaml # .agents/notes/proposed/process/2026-06-11-api-extractor-reports.md # .agents/notes/proposed/process/2026-06-11-api-extractor-reports.zh.md # .agents/notes/proposed/process/2026-06-11-architectural-conformance.i18n.yaml # .agents/notes/proposed/process/2026-06-11-architectural-conformance.zh.md # .agents/notes/proposed/process/2026-06-11-supply-chain-and-vendor-drift.i18n.yaml # .agents/notes/proposed/process/2026-06-11-supply-chain-and-vendor-drift.zh.md # .agents/notes/proposed/process/2026-06-20-discover-package-inventory.i18n.yaml # .agents/notes/proposed/process/2026-06-20-discover-package-inventory.zh.md # .agents/notes/proposed/simplification/2026-06-20-unify-agent-and-session-id.i18n.yaml # .agents/notes/proposed/simplification/2026-06-20-unify-agent-and-session-id.zh.md # .agents/notes/proposed/simplification/2026-07-04-prune-dead-core-spine-surface.i18n.yaml # .agents/notes/proposed/simplification/2026-07-04-prune-dead-core-spine-surface.zh.md # .agents/notes/proposed/simplification/2026-07-12-simplify-session-log-representation.i18n.yaml # .agents/notes/proposed/simplification/2026-07-12-simplify-session-log-representation.zh.md # .agents/notes/proposed/testing/2026-06-11-deterministic-and-stress-testing.i18n.yaml # .agents/notes/proposed/testing/2026-06-11-deterministic-and-stress-testing.zh.md # .agents/notes/proposed/testing/2026-06-11-mutation-testing.i18n.yaml # .agents/notes/proposed/testing/2026-06-11-mutation-testing.zh.md # .agents/notes/rejected/architecture/2026-06-11-immutable-public-surfaces.i18n.yaml # .agents/notes/rejected/architecture/2026-06-11-immutable-public-surfaces.zh.md # .agents/notes/rejected/architecture/2026-06-20-providerless-example-base.i18n.yaml # .agents/notes/rejected/architecture/2026-06-20-providerless-example-base.zh.md # .agents/notes/rejected/simplification/2026-06-20-assembled-assistant-messages-only.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-assembled-assistant-messages-only.zh.md # .agents/notes/rejected/simplification/2026-06-20-drop-acp-session-load.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-drop-acp-session-load.zh.md # .agents/notes/rejected/simplification/2026-06-20-drop-acp-terminal-meta.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-drop-acp-terminal-meta.zh.md # .agents/notes/rejected/simplification/2026-06-20-drop-bash-output-spill-files.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-drop-bash-output-spill-files.zh.md # .agents/notes/rejected/simplification/2026-06-20-drop-durable-step-boundaries.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-drop-durable-step-boundaries.zh.md # .agents/notes/rejected/simplification/2026-06-20-drop-unused-session-lineage.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-drop-unused-session-lineage.zh.md # .agents/notes/rejected/simplification/2026-06-20-fold-session-persistence-interface.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-fold-session-persistence-interface.zh.md # .agents/notes/rejected/simplification/2026-06-20-generic-tool-rendering.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-generic-tool-rendering.zh.md # .agents/notes/rejected/simplification/2026-06-20-retire-mid-turn-steering.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-retire-mid-turn-steering.zh.md # .agents/notes/rejected/simplification/2026-06-20-single-session-acp-bridge.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-single-session-acp-bridge.zh.md # .agents/notes/rejected/simplification/2026-06-20-truncate-interrupted-turns.i18n.yaml # .agents/notes/rejected/simplification/2026-06-20-truncate-interrupted-turns.zh.md # .agents/notes/rejected/simplification/2026-07-04-prune-unimplemented-subagent-vocabulary.i18n.yaml # .agents/notes/rejected/simplification/2026-07-04-prune-unimplemented-subagent-vocabulary.zh.md # .agents/notes/rejected/simplification/2026-07-12-collapse-workflow-to-foreground-core.i18n.yaml # .agents/notes/rejected/simplification/2026-07-12-collapse-workflow-to-foreground-core.zh.md # .agents/notes/rejected/simplification/2026-07-12-prune-unused-skill-registry-surface.i18n.yaml # .agents/notes/rejected/simplification/2026-07-12-prune-unused-skill-registry-surface.zh.md # docs/rfc/implemented/architecture/2026-06-18-agent-lifecycle-and-ownership-seams.md # docs/rfc/implemented/architecture/2026-06-18-session-surface.md # docs/rfc/implemented/architecture/2026-06-20-branded-ids.md # docs/rfc/implemented/architecture/2026-07-02-fs-per-session-cwd.md # docs/rfc/implemented/feature/2026-06-18-compaction-capability-seam.md # docs/rfc/implemented/feature/2026-07-07-session-prefix.md # docs/rfc/implemented/process/2026-06-20-rfc-classification.md # docs/rfc/implemented/process/2026-07-04-generate-rfc-index-tables.md # docs/rfc/implemented/process/2026-07-05-uniform-rfc-format.md # docs/rfc/implemented/process/2026-07-06-parallel-github-ci-gates.md # docs/rfc/implemented/process/2026-07-06-parallel-pre-push-gates.md # docs/rfc/implemented/process/2026-07-12-package-model-experience-contract.md # docs/rfc/implemented/simplification/2026-06-20-remove-agent-boundary-mirror-events.md # docs/rfc/implemented/simplification/2026-07-04-prune-producerless-vocabulary-variants.md # docs/rfc/implemented/testing/2026-06-20-remove-redundant-snapshot-log-goldens.md # docs/rfc/implemented/testing/2026-07-08-shared-acp-snapshot-package.md # docs/rfc/proposed/architecture/2026-06-20-generic-long-running-tool-runtime.md # docs/rfc/proposed/simplification/2026-06-20-unify-agent-and-session-id.md # docs/rfc/proposed/simplification/2026-07-12-simplify-session-log-representation.md # docs/rfc/rejected/simplification/2026-07-04-prune-unimplemented-subagent-vocabulary.md # scripts/translation-pairing.manifest.json
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Tianyi Cui
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# RFC: 嵌套 agent 的逐会话快照回放
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Status: implemented
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[English](2026-06-22-subagent-snapshot-replay.md) | 中文
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## 问题
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快照测试层（`pnpm run test:snapshot`）启动真实的 `acp-agent` 子进程，通过 [`dsh-llm-replay`](../../../../packages/support/llm-replay) 回放录制的会话，并将归一化后的 stdout transcript（文本记录）与重新持久化的会话日志对已提交的金标文件做 diff。这是唯一一个端到端验证完整编辑器侧 transcript 的测试层。
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该层最初为每个进程只有一个会话而构建，这一假设硬编码在两处：
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- **`dsh-llm-replay` 没有做任何键控。** 它用一个全局游标，将第 N 次 `llm/stream` 调用对应到单一录制序列的第 N 条。当父 agent 和一个进程内 subagent 在同一个上下文上同时流式输出时，调用交错，单一游标会把子 agent 的脚本发给父 agent（反之亦然）。
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- **harness 只收集一份日志。** `findSessionLog` 遍历 sessions 根目录，返回找到的第一个 `.jsonl`。subagent 作为第二个 `Session` 运行，在同一个 cwd bucket 下有自己的日志，因此子 agent 的 transcript 被静默丢弃。
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这就是 [subagent seam RFC](../../implemented/feature/2026-06-21-subagent-capability-seam.md) 中记录的 `TODO(subagent-snapshots)` 延期项：进程内后端（PR2）已有单元测试和 e2e 覆盖，但全 transcript 快照层在本基础设施就绪之前无法表达嵌套 agent 的形态。本 RFC 即为该堆叠后续。
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## 决策
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回放按**调用方会话**键控，harness 收集**所有**会话日志。
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### 1. 调用方会话 id 附着在模型请求上
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`GenerateOptions` 新增可选字段 `sessionId`，在请求组装时从 `agent.session.id` 赋值。适配器忽略它；`llm/stream` 监听器用它按发起会话路由。其类型为 `Branded<'SessionId'>`（来自 `dsh-brand`）而非 `dsh-session` 的 `SessionId`，因为后者所在包（package）导入了 `dsh-llm` 的 `Message`，反向导入会形成循环。两个类型等价，因此会话 id 赋值无需类型转换。将 brand 移到一个专用 ids 包属于独立工作，因为它会影响所有 id 导入。
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### 2. 回放按首次调用顺序将活跃会话绑定到录制脚本
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嵌套场景录制多份日志：父会话（`session.jsonl`）加每个 subagent 子会话各一份（`session.1.jsonl`……）。`dsh-llm-replay` 全部加载，为每个录制会话派生一份脚本，并按 header 中的 `createdAt` 排序（父会话先于子会话创建）。
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活跃会话 id 每次运行都是全新随机值，永远不等于录制时的 id，因此活跃会话无法通过 id 相等绑定到脚本。取而代之的是**首次调用顺序**绑定：第一个发起任何模型调用的活跃会话认领第一份有序脚本（即父会话：`createdAt` 最早，且必然最先流式输出，因为它必须先运行一个轮次才能委派），下一个新活跃会话认领下一份脚本，依此类推。此后每个会话独立推进自己的游标。
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这种方式按谁在调用键控，而非按全局调用顺序。因此即使 subagent 将来并发或在后台运行（全局游标会导致交错），它仍然正确。不携带 `sessionId` 的调用（直接在单元测试中调用 `stream()`）被视为一个匿名会话、绑定到主脚本，因此单会话路径与旧行为逐字节一致。活跃会话数多于录制脚本数时会快速失败报错（出现了未录制的 subagent），绝不会静默错误路由。
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子 fixture（测试前置数据）按 `createdAt` 排序，在兄弟会话严格顺序执行时与调用顺序一致。id 平局打破仅使退化碰撞具有确定性。并发或后台子会话必须引入显式的首次调用序号，而非依赖时间戳。
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## 曾考虑的替代方案
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曾考虑但否决的方案是：**将父子日志按调用顺序合并**为一份全局脚本（仅在进程内 subagent 执行严格嵌套——父 agent 阻塞等待子 agent——时才正确）。对当前的同步裁剪而言更简单，但将「父阻塞于子」这一不变式固化了进去；未来若引入后台/并发 subagent 就会失效。逐会话键控则不会。
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### 3. harness 收集所有日志，主会话优先
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`harvestSessionLogs` 收集 sessions 根目录下每个 cwd bucket 中的所有 `.jsonl`（JSONL 后端将父会话与同 cwd 的子会话放在同一个 bucket），解析各自的 header，并按主会话优先排序：顶层会话（无 `parentSession`）在前，各子会话按 `createdAt` 升序排列。`RunResult.sessionLogs` 是复数结果；spec 在录制时将每份日志写回对应 fixture（`session.jsonl` + `session.<n>.jsonl`），在回放时将每份收集到的日志与其 fixture 做 diff。归一化器已支持复数会话 id 并会折叠任何游离 UUID，因此无需修改归一化器。
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### 4. 场景
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新增两个嵌套场景，均对真实 API 录制：
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- **`subagent-spawn`**：父 agent 通过 `subagent` 工具将一个子任务委派给一个新 spawn 的子 agent（2 个会话）。
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- **`subagent-multi`**：父 agent 委派两个子任务，各自交给自己的 spawn 子 agent（3 个会话），以三份并行脚本和同一父 agent 下两个子会话的 `createdAt` 排序来压测逐会话键控。
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两者均在默认门禁中以 keyless 方式回放。
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## 后果
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- `TODO(subagent-snapshots)` 延期项已解决：嵌套 agent 的 transcript 现在是快照层的一等形态。
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- `GenerateOptions.sessionId` 是一个小而诚实的 core-seam 新增，在回放之外同样有用（遥测、请求路由）。
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- `subagent` 工具绑定到单一提供方，因此 `subagent-multi` 中的两个子 agent 都是 spawn（全新创建）。键控按会话路由而非按后端路由，因此对 fork 同样正确。但脚本*派生*逻辑此前不正确：fork 子会话的日志以种子化的父前缀（父会话的 `assistant/chunk` 事件）开头，如果从完整日志派生脚本，就会把父 agent 的响应当作子 agent 的来回放。这一正确性缺口通过持久化种子边界来弥合——见 [Persist the seed boundary so fork-child replay routes correctly](2026-06-22-fork-child-replay-seed-boundary.md)——录制的 fork 与混合 spawn+fork 场景现在通过一份 transcript 同时验证两种传输方式（见 [Record fork and mixed spawn+fork snapshot scenarios](2026-06-22-fork-snapshot-scenarios.md)）。
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- 进程外（ACP）subagent 是完全不同的回放形态（每个子 agent 是自己的进程、有自己的回放），作为 `TODO(acp-subagent-replay)` 记录在 PR3 计划中。
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