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
#	.agents/notes/implemented/process/2026-07-04-generate-rfc-index-tables.zh.md
#	.agents/notes/implemented/process/2026-07-04-persistence-log-catalog.i18n.yaml
#	.agents/notes/implemented/process/2026-07-04-persistence-log-catalog.zh.md
#	.agents/notes/implemented/process/2026-07-05-uniform-rfc-format.i18n.yaml
#	.agents/notes/implemented/process/2026-07-05-uniform-rfc-format.zh.md
#	.agents/notes/implemented/process/2026-07-06-export-surface-jsdoc-gate.i18n.yaml
#	.agents/notes/implemented/process/2026-07-06-export-surface-jsdoc-gate.zh.md
#	.agents/notes/implemented/process/2026-07-06-generated-config-catalog.i18n.yaml
#	.agents/notes/implemented/process/2026-07-06-generated-config-catalog.zh.md
#	.agents/notes/implemented/process/2026-07-06-node-engine-floor.i18n.yaml
#	.agents/notes/implemented/process/2026-07-06-node-engine-floor.zh.md
#	.agents/notes/implemented/process/2026-07-06-parallel-github-ci-gates.i18n.yaml
#	.agents/notes/implemented/process/2026-07-06-parallel-github-ci-gates.zh.md
#	.agents/notes/implemented/process/2026-07-06-parallel-pre-push-gates.i18n.yaml
#	.agents/notes/implemented/process/2026-07-06-parallel-pre-push-gates.zh.md
#	.agents/notes/implemented/process/2026-07-10-readme-known-limitations-gate.i18n.yaml
#	.agents/notes/implemented/process/2026-07-10-readme-known-limitations-gate.zh.md
#	.agents/notes/implemented/process/2026-07-12-package-model-experience-contract.i18n.yaml
#	.agents/notes/implemented/process/2026-07-12-package-model-experience-contract.zh.md
#	.agents/notes/implemented/simplification/2026-06-19-drop-mutable-session-summary.i18n.yaml
#	.agents/notes/implemented/simplification/2026-06-19-drop-mutable-session-summary.zh.md
#	.agents/notes/implemented/simplification/2026-06-20-collapse-trace-only-session-events.i18n.yaml
#	.agents/notes/implemented/simplification/2026-06-20-collapse-trace-only-session-events.zh.md
#	.agents/notes/implemented/simplification/2026-06-20-drop-unconsumed-llm-adapter-change-event.i18n.yaml
#	.agents/notes/implemented/simplification/2026-06-20-drop-unconsumed-llm-adapter-change-event.zh.md
#	.agents/notes/implemented/simplification/2026-06-20-drop-unconsumed-llm-assembled-surfaces.i18n.yaml
#	.agents/notes/implemented/simplification/2026-06-20-drop-unconsumed-llm-assembled-surfaces.zh.md
#	.agents/notes/implemented/simplification/2026-06-20-prune-dead-seam-methods.i18n.yaml
#	.agents/notes/implemented/simplification/2026-06-20-prune-dead-seam-methods.md
#	.agents/notes/implemented/simplification/2026-06-20-prune-dead-seam-methods.zh.md
#	.agents/notes/implemented/simplification/2026-06-20-public-agent-stop-surface.i18n.yaml
#	.agents/notes/implemented/simplification/2026-06-20-public-agent-stop-surface.zh.md
#	.agents/notes/implemented/simplification/2026-06-20-remove-agent-boundary-mirror-events.i18n.yaml
#	.agents/notes/implemented/simplification/2026-06-20-remove-agent-boundary-mirror-events.zh.md
#	.agents/notes/implemented/simplification/2026-06-26-fsspec-style-fs-seam.i18n.yaml
#	.agents/notes/implemented/simplification/2026-06-26-fsspec-style-fs-seam.zh.md
#	.agents/notes/implemented/simplification/2026-07-02-remove-stream-chunk-mirror.i18n.yaml
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#	.agents/notes/implemented/simplification/2026-07-04-drop-image-content-block.i18n.yaml
#	.agents/notes/implemented/simplification/2026-07-04-drop-image-content-block.zh.md
#	.agents/notes/implemented/simplification/2026-07-04-drop-inert-request-knobs.i18n.yaml
#	.agents/notes/implemented/simplification/2026-07-04-drop-inert-request-knobs.zh.md
#	.agents/notes/implemented/simplification/2026-07-04-drop-unconsumed-web-observation-surface.i18n.yaml
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#	.agents/notes/implemented/simplification/2026-07-04-fold-stdio-ui-helper.i18n.yaml
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#	.agents/notes/implemented/simplification/2026-07-04-prune-producerless-vocabulary-variants.i18n.yaml
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#	.agents/notes/implemented/simplification/2026-07-04-prune-write-only-fs-surface.i18n.yaml
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#	.agents/notes/implemented/simplification/2026-07-04-remove-agent-steering-mirror.i18n.yaml
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#	.agents/notes/implemented/simplification/2026-07-04-share-app-bin-boot-glue.i18n.yaml
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#	.agents/notes/implemented/simplification/2026-07-04-tighten-hook-protocol-contract.i18n.yaml
#	.agents/notes/implemented/simplification/2026-07-04-tighten-hook-protocol-contract.zh.md
#	.agents/notes/implemented/simplification/2026-07-04-trim-acp-bridge-unreachable-surface.i18n.yaml
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#	.agents/notes/implemented/simplification/2026-07-12-drop-unconsumed-skill-provider-events.i18n.yaml
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#	.agents/notes/implemented/simplification/2026-07-12-prune-unused-web-seam-fields.i18n.yaml
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#	.agents/notes/implemented/testing/2026-06-11-property-based-testing.i18n.yaml
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#	.agents/notes/implemented/testing/2026-06-19-acp-snapshot-tests.i18n.yaml
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#	.agents/notes/implemented/testing/2026-06-19-real-api-e2e-ci.i18n.yaml
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#	.agents/notes/implemented/testing/2026-06-20-remove-redundant-snapshot-log-goldens.i18n.yaml
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#	.agents/notes/implemented/testing/2026-06-22-fork-child-replay-seed-boundary.i18n.yaml
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#	.agents/notes/implemented/testing/2026-06-22-fork-snapshot-scenarios.i18n.yaml
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#	.agents/notes/implemented/testing/2026-06-22-subagent-snapshot-replay.i18n.yaml
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#	.agents/notes/implemented/testing/2026-07-04-hook-snapshot-matrix.i18n.yaml
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#	.agents/notes/implemented/testing/2026-07-04-single-source-acp-replay-config.i18n.yaml
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#	.agents/notes/implemented/testing/2026-07-06-pin-request-header-content-in-one-scenario.i18n.yaml
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Tianyi Cui
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# RFC: ask-user 提问能力
Status: implemented
[English](2026-06-25-ask-user-question.md) | 中文
## 问题
agent(智能体)有时仅凭模型推理(inference)无法安全地继续执行:它需要人类选择路径、确认有风险的或默认的操作,或者提供缺失的信息。在此变更之前,获取答案的唯一方式是模型在 assistant 文本中提问然后停止,这打断了正常的工具调用循环:agent 没有结构化的暂停方式,没有供 UI 使用的选项元数据,没有中止/错误分类体系,也没有让非 stdio 前端一致地呈现问题的途径。
这是一个面向用户的能力,但它也跨越了包(package)边界。面向模型的工具需要一套提供方无关的请求词汇;每个 UI 界面需要决定如何展示和收集答案;agent loop(智能体循环)应保持不变,因为工具调用本身已具备正确的异步形状。
## 决策
引入 `dsh-user-interaction` 作为 `ctx.userInteraction` 的提供方无关接口包,与面向模型的消费方 `dsh-tool-ask-user` 一同放在 `packages/ui` 下。这一分组是有意为之的:向人类提问是一种由 UI 支撑的产品功能,不属于无提供方的核心主干。seam 仍然拥有稳定的请求/应答/错误词汇,而 UI 产品界面提供收集答案的具体 provider。该工具注册 `ask_user_question`,转发 `{ questions, agent, signal }`,并将 provider 计算出的结构化答案作为工具结果返回。
面向模型的请求词汇有意与产品调研 schema 对齐:`ask_user_question({ questions: [{ id, question, header?, options?: [{ label, description? }], multi_select? }] })`。`id` 按问题提供并在结果中回传,使批量请求无需依赖问题文本即可路由。`label` 既是面向用户的显示文本,也是返回给模型的选中值;没有单独的 `value`,没有 `recommended`,没有 `allow_custom`,也没有 `desc` 别名。
Provider 返回 `{ answers: [{ id, selected, custom? }] }`。`selected` 始终是选中选项 label 的数组,因此单选和 `multi_select` 的答案共享同一种结果形状。`custom` 承载自由文本的「其他」答案;无选项的问题直接收集 `custom`。当 `custom` 存在时,它覆盖任何已选择的选项,`selected` 为空。
`UserInteractionError` 继承 `HarnessError`,因此 `NO_PROVIDER`、`ASK_ABORTED`、ACP(Agent Client Protocol)取消或会话路由缺失等失败会以机器可路由的 `{ name, code }` 工具错误形式通过 `ctx.tools.execute()` 传出。这与结构化错误分类体系一致,使模型或包装插件能够区分「用户取消」与一般的抛出异常。
## UI 映射
`dsh-stdio-demo` 的包内 readline 模块渲染每个问题,在下一行显示每个选项的 `description`,支持以逗号/空格分隔的数字选择 `multi_select`,接受自由格式的自定义答案,并在中止、provider dispose(资源释放)或 stdin EOF 时拒绝待处理的问题。批量请求按顺序询问,作为一个答案对象整体解析。stdio provider 通过内部队列序列化并发请求,确保同一时刻只有一个提示占用 stdin。
`dsh-acp` 为 ACP 会话提供同一 seam。它通过 bridge 的 `agent→sessionId` 反向映射将调用方 `Agent` 的 ask 请求路由出去,并为每个问题调用 ACP `unstable_createElicitation`(附带会话范围的表单)。单选选项变为 `choice` 字符串枚举;`multi_select` 选项变为 `choice` 数组枚举;无选项的问题使用必填的 `custom` 文本字段。如果客户端同时返回 `choice` 和非空 `custom`,以 custom 答案为准。ACP `decline`/`cancel`、缺失答案、缺失会话以及客户端不支持 elicitation,都会转为结构化的 `UserInteractionError`。
ACP 映射有意使用 elicitation 而非 `session/request_permission`。`request_permission` 仍保留给独立的权限门禁:它是围绕工具执行的 yes/no 或策略式授权协议。`ask_user_question` 是一个通用的信息收集工具,支持可选的自由格式答案,因此 ACP 表单 elicitation 是更贴合的协议。bridge 的会话路由与未来的权限门禁共享,但用户意图不同。
## 曾考虑的替代方案
**Assistant 文本后跟一个停止的轮次。** 模型可以在纯 assistant 文本中向用户提问然后停止。这会丢失结构化选项元数据,UI 没有提供方无关的方式来渲染选择,且下一条人类回答只能作为新的 user prompt 到达,而非作为需要答案的那次操作的结果。
**核心拥有的 ask-user 包。** 最初实现将 seam 和面向模型的工具分别放在 `packages/core` 和 `packages/ui`,但两者描述的是同一个由 UI 支撑的人机交互功能。seam 仍然是提供方无关的,但它不是像会话、工具或 agent 注册表那样的无提供方核心基础设施。将 `dsh-user-interaction` 和 `dsh-tool-ask-user` 一起放在 `packages/ui` 下,使包的划分与产品边界一致:应用和 bridge 提供人类答案的 provider,stdio 应用选择性加载面向模型的工具。
**ACP `session/request_permission`。** 权限请求是围绕工具执行的授权;`ask_user_question` 是带可选自由格式答案的信息收集。将权限用于通用提问会混淆两个不同的产品概念,并使未来的权限门禁更难推理。
**循环级别的暂停原语。** agent loop 已经知道如何等待工具调用并从工具结果恢复。添加新的循环特殊分支会重复这一异步形状,并迫使每个循环实现都了解一个 UI 关注点。
## 后果
ACP elicitation 目前在 SDK 中标记为 unstable。回退仍然是结构化的:如果客户端未实现它,工具返回 `ASK_FAILED` 而非挂起。后续 ACP 稳定化可能重命名或重塑该方法;该迁移应限制在 `dsh-acp` 内部,因为核心 `ctx.userInteraction` 词汇是提供方无关的。
该功能赋予模型一个强大的暂停原语,因此 prompt 引导很重要。工具描述告诉模型:提问要简洁,尽可能使用选项。产品策略后续可以包装 `tools/execute` 来限制工具何时可用,但循环不应对其做特殊处理。
`dsh-user-interaction` 和 `dsh-tool-ask-user` 都位于 `packages/ui`,因为它们共同构成一个面向产品的人机交互能力。`agent-core` 不加载工具或 provider。`stdio-agent` 选择性加载 seam、其 readline provider 和面向模型的工具。`acp-agent` 默认只保留 `userInteraction` seam/provider:ACP elicitation 支持仍取决于客户端,因此 ACP 叶节点必须在其客户端能完成 elicitation 请求后才有意加载面向模型的工具。
## 测试
单元覆盖率固定了以下场景:provider 注册/释放、重复 provider 拒绝、provider 就绪前中止、空问题拒绝、通过 `ctx.tools.execute()` 传出的结构化工具错误、批量答案、多选答案、自定义答案,以及模型 schema(包括移除 `value`、`recommended`、`allow_custom` 和 `desc`)。`dsh-stdio-demo` 测试覆盖选项描述、排队请求、EOF/中止清理、无选项自由格式输入、无效选项重新提示、重复多选编号和批量问题流。ACP bridge 测试驱动一个真实的内存 ACP 连接(使用真实的 `ask_user_question` 工具),验证选中选项、custom 覆盖 choice、多选和无选项自由格式 elicitation 路径能继续 agent loop。