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: ACP 快照测试——一次录制 / 确定性回放
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Status: implemented
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[English](2026-06-19-acp-snapshot-tests.md) | 中文
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## 问题
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单元测试无法覆盖完整的 ACP（Agent Client Protocol）子进程 transcript（文本记录），而真实 API 测试既不确定又需要密钥。因此，面向编辑器的 `session/update` 输出可能在单元覆盖率全绿的情况下发生回归，正如 [default-export 事后分析](../../../postmortem/0001-acp-default-export-drops-inject.md)所揭示的那样。
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全 transcript 测试的阻塞因素在于模型：agent 的输出由非确定性的 LLM（大语言模型）驱动，而每次运行都命中真实 API 的密钥门控测试既不确定也无法在 CI 中运行。我们需要真实运行的保真度与 fixture（测试前置数据）的确定性兼得。
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本 RFC 记录了新增第三层测试——**快照测试**——的决策，以及使其具备确定性、CI 中无需密钥、维护成本低的设计选择。
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## 决策
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快照测试启动真实的 ACP 示例，通过确定性脚本驱动其 stdio 协议，并将归一化后的输出与已提交的 golden 文件比对。一次从真实 API 录制的会话日志为后续所有模型流提供数据。fixture 就是产品正常持久化的 JSONL。
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### fixture 即持久化的会话 JSONL
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每个场景的 `session.jsonl` 从一次真实运行中采集。`assistant/chunk` 事件重现模型流；tool、message 和 boundary 事件捕获 harness 行为。一份普通的会话产物因此同时充当回放源和行为 golden。
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### 回放从日志推导模型脚本
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`llm-replay` 短路了提供方无关的 `llm/stream` waterfall（瀑布式事件）。`deriveReplayScript()` 按 `(turn, step)` 对已录制的 chunk 分组，每次模型调用服务一组。agent loop（智能体循环）每个 step 发起一次流调用，因此分组精确对应，错误结束 chunk 也无需特殊处理。
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### 内存中的回放条目遵守完整的 LLM 契约
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`deriveReplayScript` 产出一组 `ReplayEntry`，即回放监听器按位置服务的内存单元：
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```
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{ kind: 'chunks', chunks: StreamChunk[] }
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| { kind: 'throw', chunks: StreamChunk[], message: string, code: string, status?: number }
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| { kind: 'hang' }
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```
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日志推导出 chunk 条目。流开始前的抛出和挂起没有可重建的 chunk 表示，因此这些场景提供 `replay.override.json`。throw 条目可以包含前缀 chunk 以模拟流中途失败。显式覆盖避免了从有损的轮次结束原因推断适配器行为。
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### 位置式回放，单个在途流
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回放是位置式的，因此每个场景只允许一个在途模型流。并发会话快照需要按请求键索引的条目。调用顺序变更需要重新录制，fixture 缺失或耗尽时立即报错。
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### 录制采集日志；无密钥回放需要无提供方的配置
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录制使用真实的 `llm-deepseek` 适配器和 JSONL 持久化后端运行场景，然后将产出的 `.jsonl` 复制到场景目录。逐事件追加是持久的，但 harness 在采集前会优雅关闭子进程（关闭 stdin → `await ctx.dispose()`），确保最终事件已刷盘。`llm-replay` 本身不做录制，它只负责回放。
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回放使用 `cordis.snapshot.yml` 覆盖配置，将真实适配器替换为 `llm-replay`，同时保留活跃的组合。录制使用普通配置和 harness 提供的持久化根目录。回放模式跳过 `.env` 加载，因此一个意外存在的 API key 不会触发真实调用。见[单源配置 RFC](2026-07-04-single-source-acp-replay-config.md)。
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### 两个表面：归一化后比对
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快照运行断言**两个**归一化后的表面，因为 harness 的外部表面是不同的：
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1. **stdout transcript**——编辑器看到的带帧 `session/update` JSON-RPC。捕获 ACP bridge 事件→update 转换（`streamSessionEventUpdate`）中的回归。与已提交的 `stdout.golden.jsonl` 比对。
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2. **重新持久化的会话 JSONL**，归一化后与 `session.jsonl` 比对。同一份 fixture 既是回放源也是预期日志。提示词文本被擦除；每个 header 类别一个场景固定可读的 prompt 和 tool 内容，见 [header-pinning RFC](2026-07-06-pin-request-header-content-in-one-scenario.md)。覆盖场景的模型行为完全来自其伴随文件。
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两个表面互补：stdout 覆盖 bridge 投影，JSONL 覆盖投影所省略的 loop、tool 和 boundary 结构。
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归一化替换 session、cwd、protocol-id、时间戳、路径和进程相关的易变值，同时保留确定性序列号。场景将真实 bash 使用限制在稳定命令范围内。stdout golden 保持协议格式（wire format）的 JSONL，每一行原始数据必须可解析为 JSON。Vitest 只更新 stdout golden；归一化后的会话相等性检查从不覆盖回放 fixture。
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### 隔离：当前靠归一化，后续可加沙箱
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工具的确定性来自临时 cwd、擦除的环境变量、全新的非登录 shell、受限命令和归一化。它不声称具备操作系统级隔离。如果需要更强的隔离层级，可通过既有的[能力 seam](../architecture/2026-06-13-capability-seams.md) 将沙箱执行器替换本地后端。
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### 回放插件是独立的包
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`@deepseek-ai/dsh-llm-replay` 是一个支撑包（package），而非示例本地的胶水代码。它通过用从 JSONL 重建的流短路 `llm/stream` 来替换真实适配器，其包级放置使回放逻辑处于正常覆盖率门禁之下。
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### 两个子命令，回放在默认门禁中
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`pnpm run test:snapshot` 无需密钥地回放已提交的 fixture；`test:snapshot:record` 使用真实 API 并重写采集到的会话日志和 stdout golden。fixture 缺失时立即报错。每个场景携带 `input.json`、`stdout.golden.jsonl` 和 `session.jsonl`；无模型场景使用仅含 header 的日志。`replay.override.json` 仅在标记为 `overridden` 的场景中必需，因为它的存在会替换推导出的回放。fixture 守卫拒绝缺失、不匹配和遗留的文件。两个命令均接受场景过滤器。
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## 曾考虑的替代方案
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- **手工编写的模型 chunk `llm.json`**：早期草案的做法。复用真实会话日志使 fixture 成为系统的真实产物而非手工构建的 mock，并兼作行为 golden。
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- **字节级 HTTP 录制库（Polly/nock/MSW）**：否决。与适配器耦合，处理流式 SSE（Server-Sent Events）时笨拙，且层级低于被测对象。
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- **从 `turn/end {kind:'error'|'aborted'}` 合成 throw/cancel 条目**：否决。这会将 `llm-replay` 耦合到 loop 内部的轮次关闭语义，且 `turn/end` 原因是有损的（无法区分抛出的 401 与 finish-error）；显式的 `replay.override.json` 伴随文件是更清晰的 seam。
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## 后果
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新测试层为每个场景增加了经评审的 input、session、stdout、可选 override 和可选 workspace fixture。workspace 种子在录制和回放时都会被复制到临时 cwd。作为回报，该层通过真实的 Loader 和 tool 组合提供确定性的无密钥 transcript 覆盖。子进程、input、workspace、归一化和回放 harness 可以支持 ACP 之外的示例。
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本 RFC 与[拟议的确定性 RFC](../../proposed/testing/2026-06-11-deterministic-and-stress-testing.md) 相关但不取代它：该提案的「通用回放 fixture」在每次测试后重新推导会话的*消息历史*（一项内部一致性不变式），而快照测试固定的是*外部协议输出*。二者互补：一个守护事件溯源不变式，另一个守护面向编辑器的契约。
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