refactor(schedule): make absolute times explicit
This commit is contained in:
Tianyi Cui
@@ -2,5 +2,5 @@
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# side as of the last confirmed-consistent state. Both languages carry equal authority;
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# after editing either side, bring the other along and re-record with:
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# pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-07-16-durable-per-step-time-context.md
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2026-07-16-durable-per-step-time-context.md: e1a5c65894913ad93f46db8ae45e5ef5ead215f3
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2026-07-16-durable-per-step-time-context.zh.md: 129920a02dc21a91ddc92de3d920ddad24968656
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2026-07-16-durable-per-step-time-context.md: d7f950ab8f669282ec102fb02ac8399613ec806b
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2026-07-16-durable-per-step-time-context.zh.md: 0eff29b14f7aaa13f4cef2bacd57b36d30dea6e5
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@@ -6,74 +6,69 @@ English | [中文](2026-07-16-durable-per-step-time-context.zh.md)
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## Problem
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A request-only clock can tell the model the current time, but replacing that value in the system prompt removes the evidence behind earlier time-sensitive reasoning. Multi-step turns need requests to retain the readings that shaped preceding steps. The request must remain reconstructable after restart, and automatic compaction must account for the same timing context the model receives.
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A request-only clock can tell the model the current time, but replacing that value in the system prompt erases the evidence behind earlier time-sensitive reasoning. Multi-step turns need requests to retain the readings that shaped preceding steps. The request must remain reconstructable after restart, and automatic compaction must account for the same timing context the model receives.
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A process-local refresh cache makes displayed time depend on state that cannot survive resume or be reconstructed from the durable session. Durable interval scheduling can reduce append frequency without introducing that hidden state.
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Local calendar work also needs to distinguish two owned facts: the immutable zone captured by the Session and the zone attached to each browser-originated request. Process state or a mutable connection default cannot represent travel, concurrent tabs, or old headerless Sessions without silently reinterpreting a request.
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A process-local refresh cache makes displayed time depend on state that cannot survive resume. Browser-originated natural language also needs a request-owned zone: a server process zone cannot infer the user's locality, while a mutable Session or connection default lets travel or concurrent tabs reinterpret another prompt.
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## Decision
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`@deepseek-ai/dsh-time-context` is an opt-in function plugin in `packages/context/time-context/`. The `context/` group holds bounded request-context enrichments that define neither a tool nor a service. Default compositions leave its disclosure and token cost disabled; the explicit Schedule Web overlay mounts it because local `at` interpretation needs request-zone context.
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`@deepseek-ai/dsh-time-context` is an opt-in function plugin in `packages/context/time-context/`. Default compositions leave its disclosure and token cost disabled; the Schedule Web overlay mounts it so the model can interpret otherwise-unqualified dates and times in the browser zone attached to the current request.
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The plugin prepends an `agent/pre-step` listener and delegates first. When the downstream decision enters a request step and a reading is due, time-context derives client zones from that decision's final messages plus user-rpc messages already entered in the open turn, then appends one reading to the decision. Steering inserted after AgentLoop claims the current batch keeps ordinary next-step ownership and receives a new reading when that step enters.
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The plugin prepends an `agent/pre-step` listener and delegates first. When the downstream decision enters and a reading is due, it combines that decision's final messages with durable user messages already in the open turn, derives browser-zone provenance from exact `user-rpc` sources, and appends one reading to the decision. Rejection, listener failure, or an already-aborted signal records nothing. Steering claimed after the current batch keeps ordinary next-step ownership and receives a fresh reading when that step enters.
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An entering step appends its returned messages followed by the time reading after `step/start`, before request derivation. A first-step decision rewritten to empty opens no request, while an empty tool continuation can still enter a later step without a new reading and reuse existing history. Rejection, failure, or cancellation before `step/start` appends nothing. Disposal prevents an in-flight listener from contributing after it wins, without adding inbox state or an AgentLoop lifecycle path.
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Each Web prompt samples the browser's IANA zone. The Host validates and canonicalizes it before binding it to the exact durable user-message source. One unique zone in the open turn resolves the request; multiple zones produce a sorted `mixed` result; no zone is `unavailable`. A resolved request tells the model to interpret unqualified dates and times in that zone. Mixed or unavailable provenance tells it to ask the user to clarify.
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Each reading has the exact snapshot source `{ kind: 'plugin', plugin: 'time-context', form: 'snapshot', sections: [{ name: 'time-context', text: <same rendered text> }] }`; both the invariant companion and Schedule fail closed if that shape or equality drifts. The immutable `SessionHeader.timeZone` and each original user-rpc message's `clientTimeZone` remain the only machine-readable owners. Time-context renders those facts for the model, while Schedule derives directly from the same header and current-turn sources instead of consuming a copy. The rendered clock uses the Session zone when available. A headerless Session uses the configured fallback, or the Node process zone resolved once at plugin load when config is omitted, while still reporting the Session zone as `unavailable`. Every explicit or Session-owned IANA zone is validated through `Intl.DateTimeFormat`.
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This message-bound provenance is not copied to `SessionHeader`, a connection default, or Schedule state. Time-context owns model guidance only. A tool accepting local calendar fields must still make its own explicit boundary; Schedule therefore requires `time_zone` rather than importing this plugin's reading ([decision](../simplification/2026-08-09-explicit-schedule-time-zone.md)).
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The optional `refreshIntervalMs` config is manually validated at plugin load as a non-negative safe integer. Omission or `0` injects on every entered request step. A positive value scans the raw session events for the most recent `user/message` with this plugin's source and injects when none exists, wall time moved backward, or the event is at least the configured age. The raw event timestamp governs even after compaction shadows the message, so scheduling persists across turns and process resume without a timer or process-local cache.
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The resolved browser zone also formats the reading's timestamp. Mixed or unavailable requests use the configured `timeZone` fallback, or the Node process zone resolved once at plugin load when config is omitted, while retaining the clarify policy. Every fallback is validated through `Intl.DateTimeFormat`.
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Each reading uses the exact snapshot source `{ kind: 'plugin', plugin: 'time-context', form: 'snapshot', sections: [{ name: 'time-context', text: <same text> }] }`. The invariant companion checks the snapshot shape, re-derives current-turn browser provenance from the original user-rpc messages, and validates the rendered timestamp zone and elapsed baseline.
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The optional `refreshIntervalMs` config is a non-negative safe integer. Omission or `0` injects on every eligible entered step. A positive value scans raw Session events for the latest plugin reading and injects when none exists, wall time moved backward, or the event is old enough. The event timestamp governs after compaction and resume without a process-local cache. The Schedule Web overlay omits the interval so every request step gets current browser guidance.
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### Text and elapsed baselines
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An injected first-step reading is:
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A resolved first-step reading is:
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```text
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Time sampled while preparing turn <turn>, step 1: <timestamp>
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Session time zone: <iana-zone-or-unavailable>.
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Client time zone for this request: <iana-zone-or-mixed-set-or-missing>.
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Time sampled while preparing turn <turn>, step 1: <timestamp-in-browser-zone>
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Browser time zone for this request: <iana-zone>. Interpret otherwise-unqualified dates and times in this zone.
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Elapsed since the preceding model-visible message: <duration-or-unavailable>.
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```
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The baseline is the latest durable preceding user, assistant, or tool-result message. The prompt entering the same proposed step has not been appended yet; the first request in a new Session therefore reports `unavailable`. Existing durable history supplies the baseline on later turns.
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Mixed and unavailable variants replace the second line with an instruction to ask for clarification. The baseline is the latest durable preceding user, assistant, or tool-result message. The prompt proposed for this step has not been appended yet; a new Session can therefore report `unavailable`.
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An injected later-step reading is:
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A later-step reading changes the first line's step number and ends with:
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```text
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Time sampled while preparing turn <turn>, step <step>: <timestamp>
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Session time zone: <iana-zone-or-unavailable>.
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Client time zone for this request: <iana-zone-or-mixed-set-or-missing>.
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Elapsed since the preceding step context: <duration-or-unavailable>.
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```
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Their baseline is the durable event timestamp of the preceding time-context message in the same turn. If interval suppression leaves no earlier same-turn reading, the duration is `unavailable`. Duration formatting uses compact whole-second units and clamps backward wall-clock movement to zero. The explicit turn and step make every retained reading attributable to its historical preparation attempt after later turns append more context.
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That baseline is the preceding time-context event in the open turn. Missing baselines report `unavailable`; duration formatting uses compact whole-second units and clamps backward wall-clock movement to zero.
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### Durability and request reconstruction
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### Durability and reconstruction
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Each reading remains a normal surface node until compaction shadows it; positive interval scheduling never removes existing readings. A later request therefore sees the cumulative unshadowed readings that affected earlier preparation and steps, rather than a system-prompt value rewritten in place. The simple source identifies the reading without duplicating the Session or request-zone facts that Schedule can derive from their original durable owners.
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An entered step appends its returned messages followed by the time reading after `step/start`, before request derivation. A later preparation failure can leave the reading in history because it records entry, not successful transmission. Each reading remains a normal surface node until compaction shadows it. A positive interval can let a later request reuse existing history without adding a fresh reading.
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The plugin does not add a system-prompt section. `request/header` contains no time-context text, and request reconstruction obtains the complete durable surface prefix at each `step/start`. Readings and requests need not map one-to-one because interval suppression can enter a request without appending a reading, while a failure after step entry may retain a reading without transmitting a request. A failure before step entry retains none.
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## Testing
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Unit and real-loop tests pin formatting, Session/fallback display zones, unique/mixed/missing client-zone derivation, both elapsed baselines, interval omission and zero, threshold boundaries, cross-turn and per-session scheduling, backward-clock behavior, invalid config, resumed raw-event lookup after compaction, post-claim steering ownership, empty suppression, cancellation, in-flight disposal, simple source validation, cumulative multi-step visibility, and absence from request headers. A keyless subprocess e2e boots the real Loader with the Headless composition, drives two ordered one-shot turns, and verifies the persisted plugin-attributed messages externally; the Schedule Web scenario verifies the same source facts through the assembled browser path.
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The plugin contributes nothing to system-prompt assembly or `request/header`. Request reconstruction obtains the complete durable surface prefix at each `step/start`, so historical requests recover the exact time and browser policy the model saw.
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## Alternatives considered
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- **Keep the dynamic system-prompt section and process-local refresh cache** — rejected because replacement erases earlier readings, cache state is not replayable, and a frozen request envelope would make the value stale for an entire loop instance.
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- **Replace the preceding context surface node** — rejected because replacement preserves the old node's position or shadows intervening conversation; neither represents when the new reading became visible.
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- **Inject from a background timer** — rejected because idle time has no pending request to consume the value, and timer-driven injection would create durable turns solely to report time passing.
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- **Expose time only through a tool** — rejected because ordinary temporal reasoning would require an avoidable tool round trip and would not guarantee a reading before every step.
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- **Use `agent/session-prefix`** — rejected because one loop-instance prefix cannot represent distinct step timestamps and does not accumulate historically attributable readings.
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- **Mutate assembled requests or register independent prompt variables** — rejected because request-local insertion bypasses the durable surface and separate providers can sample different instants. One attributed context message records the timestamp and elapsed baseline atomically.
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- **Copy request zones into a durable authority and absorb post-claim steering into the current step** — rejected because the immutable Session header and entered user-rpc sources already own those facts, while no current production assembly boundary requires inbox reentry. Copying them would add validation and AgentLoop lifecycle solely for a second representation; post-claim steering already receives fresh context in its ordinary next step.
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- **Use the process zone or most recent browser as request state** — rejected because deployment state cannot infer a remote user's zone, while a mutable connection default lets travel or concurrent tabs reinterpret another request. The process or configured zone remains only a display fallback for headerless Sessions.
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- **Mount the plugin in default compositions or place it in `core/`** — rejected because disclosure, freshness, and history cost are deployment choices for an optional context leaf. A feature-specific overlay may opt in when it has a current consumer.
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- **Replace a dynamic system-prompt value** — rejected because replacement erases prior readings and changes reconstructed historical requests.
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- **Persist a Session default zone** — rejected because the browser fact belongs to one prompt; travel and concurrent tabs must not mutate shared meaning or spread zone state through Session, fork, and persistence contracts.
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- **Copy the browser zone into a second context authority** — rejected because the original user-rpc source already owns it and the invariant can re-derive policy directly.
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- **Let Schedule consume the reading implicitly** — rejected because prose context is not a stable typed default and would couple an absolute-time parser to AgentLoop history. The model instead passes an explicit offset or zone.
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- **Use only the process zone** — rejected because deployment locality cannot infer a remote user's zone. It remains a display fallback when request provenance is absent or mixed.
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- **Expose time only through a tool** — rejected because ordinary temporal reasoning would require an avoidable round trip and would not ensure a reading before each step.
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- **Mount time-context by default** — rejected because disclosure, freshness, and history cost remain composition policy.
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## Verification
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Unit and real-loop tests pin timestamp formatting, unique/mixed/missing browser derivation, fallback display, both elapsed baselines, interval boundaries, cross-turn and resumed scheduling, backward-clock behavior, steering ownership, cancellation, exact snapshot validation, and request reconstruction. Host/client tests pin browser sampling plus validation and canonicalization at prompt entry. The keyless assembled Schedule Web scenario sends a real browser prompt, observes the same zone in the model request, and verifies that the model supplies it explicitly to `schedule_create`.
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## Consequences
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- Omission or `0` records every entered request step; a positive interval reduces append frequency and history growth while preserving durable scheduling across resume.
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- Timing context remains append-only until compaction shadows older surface nodes; a turn that opens no step records no reading.
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- First-step duration measures from the previous durable model-visible event, while later-step duration measures model and tool processing since the preceding step context.
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- The Session zone is immutable and each browser zone is message-bound, so travel or concurrent tabs expose disagreement instead of changing shared state.
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- A headerless Session renders through the configured or deployment-process fallback but remains reported as `unavailable`; elapsed time still uses durable harness append boundaries rather than client-origin timestamps.
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- Browser-zone meaning is request-local and durable without changing Session, fork, JSONL, or SQLite schemas.
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- The model receives the requested browser-local assumption on each Schedule Web request step; mixed or missing provenance asks instead of guessing.
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- Tools remain explicit: context helps the model choose fields but does not become a hidden package-seam default.
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- Timing context remains append-only until compaction; a positive interval reduces history growth but can omit fresh browser guidance on later requests.
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@@ -6,64 +6,69 @@ Status: implemented
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## 问题
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仅存在于请求中的时钟可以告诉模型当前时间，但在系统提示词中替换这个值会移除先前对时间敏感的推理所依据的证据。在包含多个步骤的轮次中，请求需要保留影响先前步骤的读数。系统必须能在重启后重建请求，自动压缩（compaction）也必须将模型实际收到的同一份时间上下文纳入考量。
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仅存在于请求中的时钟可以告诉模型当前时间，但在系统提示词中替换这个值会抹去先前对时间敏感的推理所依据的证据。在包含多个步骤的轮次中，请求需要保留影响先前步骤的读数。系统必须能在重启后重建请求，自动压缩（compaction）也必须将模型实际收到的同一份时间上下文纳入考量。
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进程本地刷新缓存会使显示时间依赖于一种既无法在恢复后保留、也无法从持久会话重建的状态。持久的间隔调度可以减少追加频率，而不引入这种隐藏状态。
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进程本地刷新缓存会使显示时间依赖于无法在恢复后保留的状态。来自浏览器的自然语言也需要归属于请求的时区：服务端进程时区无法推断用户所在地，而可变的会话或连接默认值会让旅行或并发标签页重新解释另一条提示词。
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## 决策
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`@deepseek-ai/dsh-time-context` 是位于 `packages/context/time-context/`、需要显式启用的函数插件。`context/` 分组容纳有界的请求上下文增强，这些增强既不定义工具也不定义服务；已交付示例不挂载此插件，因为时区披露与 token 成本属于部署策略。它注册一个前置的 `agent/pre-step` 监听器；当应生成读数且下游决策为进入时，返回一条额外的 `UserMessage`。该消息携带来源 `{ kind: 'plugin', plugin: 'time-context' }`；被抑制、被拒绝或失败的尝试不会追加任何内容。
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`@deepseek-ai/dsh-time-context` 是位于 `packages/context/time-context/`、需要显式启用的函数插件。默认组合不启用其披露内容与 token 成本；Schedule Web overlay 会挂载它，使模型能够按附加到当前请求的浏览器时区解释未明确限定时区的日期和时间。
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监听器在 `step/start` 之前采样，并仅在最终决定进入时确定该读数。AgentLoop 会在 `step/start` 之后、请求派生之前记录它。因此，下游拒绝或失败会阻止读数进入持久历史。
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该插件会前置一个 `agent/pre-step` 监听器，并先行委托下游。当下游决策进入步骤且需要生成读数时，插件会把该决策的最终消息与开放轮次中已有的持久用户消息合并，从确切的 user-rpc 来源派生浏览器时区来源信息，并向该决策追加一条读数。决策被拒绝、监听器失败或信号已经中止时，不会记录任何内容。在当前批次之后被认领的 steering（中途引导）仍归属于普通的下一步骤，并在该步骤进入时获得新读数。
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省略可选配置 `timeZone` 时，插件在加载时解析一次 Node 进程的 IANA 时区；显式值由 `Intl.DateTimeFormat` 校验。时间戳包含数字 UTC 偏移和解析后的 IANA 时区。
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每条 Web 提示词都会采样浏览器的 IANA 时区。Host 校验并规范化该值，再将其绑定到确切的持久用户消息来源。开放轮次中唯一一个时区可解析请求；多个时区会产生排序后的 `mixed` 结果；没有时区则为 `unavailable`。解析成功的请求会告诉模型，把未限定时区的日期和时间解释为该时区。来源信息混杂或不可用时，模型会收到要求用户澄清的指令。
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插件在加载时手动校验可选配置 `refreshIntervalMs`，其值必须为非负安全整数。省略或设为 `0` 时，每次符合条件的准备尝试都会注入。设为正数时，插件扫描原始会话事件，查找来源属于本插件的最新 `user/message`；不存在此类事件、系统挂钟向后移动，或该事件已达到配置时长时，插件执行注入。即使压缩已隐藏消息，调度仍以原始事件时间戳为准，因此该机制无需计时器或进程本地缓存，也能跨轮次和进程恢复持续生效。
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这种与消息绑定的来源信息不会复制到 `SessionHeader`、连接默认值或 Schedule 状态。Time-context 只负责模型指导。接受本地日历字段的工具仍必须自行定义显式边界；因此 Schedule 要求 `time_zone`，而不是导入该插件的读数（[决策](../simplification/2026-08-09-explicit-schedule-time-zone.md)）。
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解析后的浏览器时区也用于格式化读数中的时间戳。请求来源信息混杂或不可用时，使用配置的 `timeZone` 回退值；如果省略该配置，则使用插件加载时解析一次的 Node 进程时区，同时仍保留要求澄清的策略。每个回退值都经 `Intl.DateTimeFormat` 校验。
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每个读数都使用确切的快照来源 `{ kind: 'plugin', plugin: 'time-context', form: 'snapshot', sections: [{ name: 'time-context', text: <same text> }] }`。不变式配套模块会校验快照形状，从原始 user-rpc 消息重新派生当前轮次的浏览器来源信息，并校验渲染的时间戳时区与经过时长基线。
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可选配置 `refreshIntervalMs` 必须是非负安全整数。省略或设为 `0` 时，每个符合条件且已进入的步骤都会注入。设为正数时，插件会扫描原始会话事件，查找最新的插件读数；不存在读数、挂钟时间倒退或事件已达到相应时长时执行注入。事件时间戳在压缩和恢复后仍是判断依据，无需进程本地缓存。Schedule Web overlay 会省略该间隔，使每个请求步骤都获得当前浏览器时区指导。
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### 文本与时长基线
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第一个步骤的注入读数为：
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已解析的第一步读数为：
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```text
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Time sampled while preparing turn <turn>, step 1: <timestamp>
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Time sampled while preparing turn <turn>, step 1: <timestamp-in-browser-zone>
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Browser time zone for this request: <iana-zone>. Interpret otherwise-unqualified dates and times in this zone.
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Elapsed since the preceding model-visible message: <duration-or-unavailable>.
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```
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基线是前一条用户消息、助手消息、工具结果或 steering（中途引导）消息。对于普通消息轮次，这包括开启轮次的已接受提示词。如果不存在模型可见消息，时长为 `unavailable`。
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混杂和不可用的变体会把第二行替换为要求澄清的指令。基线是最新一条在其之前持久化的用户、助手或工具结果消息。为该步骤拟议的提示词尚未追加，因此新会话可能报告 `unavailable`。
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后续步骤的注入读数为：
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后续步骤读数会改变第一行的步骤号，并以下行结束：
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```text
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Time sampled while preparing turn <turn>, step <step>: <timestamp>
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Elapsed since the preceding step context: <duration-or-unavailable>.
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```
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|
||||
其基线是同一轮次中上一条时间上下文消息的持久事件时间戳。如果间隔抑制导致同一轮次中没有更早的读数，时长为 `unavailable`。时长采用紧凑的整秒单位，并在系统挂钟向后移动时钳制为零。显式的轮次号和步骤号使每个保留的读数在后续轮次追加更多上下文后，仍可归属于对应的历史准备尝试。
|
||||
其基线是开放轮次中的前一个 time-context 事件。缺少基线时报告 `unavailable`；时长采用紧凑的整秒单位，并在挂钟时间倒退时限制为零。
|
||||
|
||||
### 持久性与请求重建
|
||||
### 持久性与重建
|
||||
|
||||
每个读数都作为普通表层节点保留，直至压缩将其隐藏；正数间隔调度绝不会移除已有读数。因此，后续请求会看到影响先前准备过程和步骤且尚未被隐藏的累计读数，而不是一个被原地改写的系统提示词值。
|
||||
已进入的步骤会在 `step/start` 之后、请求派生之前，先追加其返回消息，再追加时间读数。后续准备失败时，读数可能留在历史中，因为它记录的是步骤进入，而不是成功传输。每个读数都作为普通表层节点保留，直至压缩将其遮蔽。正数间隔可以让后续请求复用现有历史，而不添加新读数。
|
||||
|
||||
插件不向系统提示词组装贡献任何内容。`request/header` 不包含时间上下文文本；请求重建从每个 `step/start` 取得完整的持久表层前缀。读数与请求无需一一对应，因为间隔抑制可以让请求进入步骤而不追加读数，拒绝或失败则两者都不追加。插件通过 agent 注册表使用生命周期监听器，运行时不需要系统提示词服务。
|
||||
插件不向系统提示词组装或 `request/header` 贡献任何内容。请求重建会在每个 `step/start` 取得完整的持久表层前缀，因此历史请求可以还原模型看到的确切时间与浏览器策略。
|
||||
|
||||
## 测试
|
||||
## 已考虑的替代方案
|
||||
|
||||
单元测试和真实 agent loop（智能体循环）测试固定格式化、两种时长基线、间隔省略和零值、阈值边界、跨轮次和各会话独立调度、挂钟后退行为、无效配置、压缩后基于恢复会话的原始事件查找、已中止信号行为、后续监听器取消和失败、监听器 dispose（资源释放）、来源与表层元数据、多步骤累计可见性，以及请求头中不存在时间上下文。无密钥子进程 e2e 测试使用 Headless 组合启动真实 loader，依次驱动两个单次任务轮次，并从外部校验持久化且来源归属于插件的消息。
|
||||
- **替换动态系统提示词值**：不予采纳，因为替换会抹去先前读数，并改变重建后的历史请求。
|
||||
- **持久化会话默认时区**：不予采纳，因为浏览器事实只属于一条提示词；旅行与并发标签页不得修改共享含义，也不得把时区状态扩散到会话、fork 与持久化约定中。
|
||||
- **把浏览器时区复制到第二个上下文权威**：不予采纳，因为原始 user-rpc 来源已经拥有该值，不变式可以直接重新派生策略。
|
||||
- **让 Schedule 隐式消费读数**：不予采纳，因为自然语言上下文不是稳定的类型化默认值，而且这会把绝对时间解析器耦合到 AgentLoop 历史。模型会改为传入显式偏移量或时区。
|
||||
- **只使用进程时区**：不予采纳，因为部署所在地无法推断远程用户的时区。请求来源信息缺失或混杂时，它仍可作为显示回退值。
|
||||
- **只通过工具提供时间**：不予采纳，因为普通时间推理会产生本可避免的往返，也无法确保每个步骤之前都有读数。
|
||||
- **默认挂载 time-context**：不予采纳，因为披露内容、新鲜度与历史成本仍属于组合策略。
|
||||
|
||||
## 考虑过的替代方案
|
||||
## 验证
|
||||
|
||||
- **保留动态系统提示词区段和进程本地刷新缓存**——不予采纳，因为替换会抹去先前读数，缓存状态无法回放，而且冻结的请求内容集合会使该值在整个 agent loop 实例期间保持陈旧。
|
||||
- **替换前一条上下文表层节点**——不予采纳，因为替换会保留旧节点的位置或隐藏中间的会话内容；两者都不能表达新读数何时开始可见。
|
||||
- **通过后台计时器注入**——不予采纳，因为空闲期间没有待处理请求消费该值，而且计时器驱动的注入会仅为报告时间流逝而创建持久轮次。
|
||||
- **只通过工具提供时间**——不予采纳，因为普通时间推理会产生本可避免的工具往返，也不能保证每个步骤之前都有读数。
|
||||
- **使用 `agent/session-prefix`**——不予采纳，因为一个 loop 实例前缀无法表示不同的步骤时间戳，也不会累计具有历史归属的读数。
|
||||
- **修改已组装的请求或注册独立提示词变量**——不予采纳，因为请求内插入会绕过持久表层，不同提供方也可能在不同时间采样。一条带来源归属的上下文消息会原子地记录时间戳和时长基线。
|
||||
- **默认使用 UTC 或增加时区检测依赖**——不予采纳，因为显式挂载的插件默认遵循其进程环境，除非操作方选择 IANA 时区，而任何服务端库都无法推断远程用户的时区。
|
||||
- **在已交付组合中挂载插件，或把它放进 `core/`**——不予采纳，因为披露内容、时区、新鲜度和历史成本是可选上下文叶节点的部署选择，不是产品主干策略。
|
||||
单元测试和真实 agent loop（智能体循环）测试固定时间戳格式化、唯一／混杂／缺失浏览器时区的派生、回退显示、两种经过时长基线、间隔边界、跨轮次与恢复后的调度、挂钟倒退行为、steering 归属、取消、精确快照校验和请求重建。Host/client 测试固定浏览器采样，以及提示词进入时的校验与规范化。无密钥的组装 Schedule Web 场景发送一条真实浏览器提示词，在模型请求中观察到同一时区，并验证模型把该时区显式传给 `schedule_create`。
|
||||
|
||||
## 后果
|
||||
|
||||
- 省略 `refreshIntervalMs` 或设为 `0` 时，每次符合条件的准备尝试都会留下记录；正数间隔会减少追加频率和历史增长，同时使持久调度在恢复后继续生效。
|
||||
- 时间上下文仅追加并保留到压缩隐藏旧表层节点为止，其中也包括后续取消或失败所留下的准备读数。
|
||||
- 第一个步骤的时长通常从开启轮次的提示词起算，后续步骤的时长则反映自上一条步骤上下文以来的模型与工具处理时间。
|
||||
- 省略 `timeZone` 时仍采用部署进程而非远程用户的时区，时长仍采用 harness 的持久追加边界而非客户端来源时间戳。若要支持客户端来源的时间，需要另行建立持久输入约定。
|
||||
- 浏览器时区含义归属于请求并可持久重建，无需更改会话、fork、JSONL 或 SQLite schema。
|
||||
- 模型在每个 Schedule Web 请求步骤中都会收到所请求的浏览器本地假设；来源信息混杂或缺失时会询问，而不是猜测。
|
||||
- 工具仍保持显式边界：上下文帮助模型选择字段，但不会成为包 seam 上隐藏的默认值。
|
||||
- 时间上下文仅追加并保留到压缩为止；正数间隔会减少历史增长，但也可能使后续请求缺少新的浏览器时区指导。
|
||||
|
||||
@@ -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 .agents/notes/implemented/feature/2026-08-05-durable-web-schedule.md
|
||||
2026-08-05-durable-web-schedule.md: 063f27d5bae6194b172d6998f338c11a4065bbd0
|
||||
2026-08-05-durable-web-schedule.zh.md: b8128d8d8e26401106a66a17a63cf8bc947b914f
|
||||
2026-08-05-durable-web-schedule.md: f107d5389ef7650b0af41b9e7dc9bd35ec0654fe
|
||||
2026-08-05-durable-web-schedule.zh.md: e170b0bf8b96526ef0f458e5583da42fa023137e
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
# Agent Note: Durable Session-local Web reminders
|
||||
# Agent Note: Durable Session-local reminders
|
||||
|
||||
Status: implemented
|
||||
|
||||
@@ -6,116 +6,70 @@ English | [中文](2026-08-05-durable-web-schedule.zh.md)
|
||||
|
||||
## Problem
|
||||
|
||||
A reminder created inside a conversation needs to survive a process restart and remain attributable to that exact Session. A process-local timer or model inbox item cannot provide that durability, while a global scheduler or private database would introduce a second identity, persistence, and lifecycle system. The user also needs a visible receipt even when the best-effort model turn later fails, without seeing a reminder whose dispatch never reached storage.
|
||||
A reminder created inside a conversation must remain attributable to that exact Session and survive a process restart. A process-local timer or inbox item cannot provide that durability, while a global scheduler or private database introduces a second identity, persistence, and lifecycle system.
|
||||
|
||||
Busy Agents, long waits, wall-clock changes, cold Sessions, forks, persistence failures, and browser history races make a simple timeout insufficient. The design must distinguish a durable record from its disposable live wait, keep a fork from inheriting its parent's active reminders, and merge a presentation sidecar that can arrive after the underlying event.
|
||||
Busy Agents, long waits, wall-clock changes, cold Sessions, forks, persistence failures, absolute calendar input, and teardown make a simple timeout insufficient. The design must distinguish a durable record from its disposable live wait, keep a fork from inheriting its parent's active reminders, and avoid spreading Schedule-specific presentation or time-zone state across unrelated components.
|
||||
|
||||
## Decision
|
||||
|
||||
The [`examples/web-schedule`](../../../../examples/web-schedule/README.md) overlay explicitly loads `@deepseek-ai/dsh-time-context`, `@deepseek-ai/dsh-tool-schedule`, and the separate `@deepseek-ai/dsh-client-ui-schedule` renderer. The default Web tree remains unchanged. Schedule observes only root Agents published after the plugin loads and installs its three tools plus one disposable owner in that Agent scope. Cold history reads, already-published roots, child Agents, and other hosts do not activate it.
|
||||
The [`examples/web-schedule`](../../../../examples/web-schedule/README.md) overlay explicitly loads `@deepseek-ai/dsh-time-context` and `@deepseek-ai/dsh-tool-schedule`; the default Web tree remains unchanged. Schedule observes only root Agents published after the plugin loads and installs its three tools plus one disposable owner in that Agent scope. Cold history reads, already-published roots, child Agents, and other hosts do not activate it.
|
||||
|
||||
The user-visible boundary is `session-local`: the original Session runs an on-time reminder only while it is live, does no external notification while cold, and processes an overdue reminder after that Session becomes live again.
|
||||
The user-visible boundary is `session-local`: the original Session runs an on-time reminder only while live, does no external notification while cold, and processes an overdue reminder after it becomes live again. Due work waits until the Agent is fully idle, then enters the ordinary next-turn queue through `followup()`; it never steers the current turn and has no independent Web receipt ([conversational delivery](../simplification/2026-08-09-conversational-schedule-delivery.md)).
|
||||
|
||||
| Scenario | Durable fact | Live behavior | User-visible result |
|
||||
| --- | --- | --- | --- |
|
||||
| Create and manage | `schedule/change` create/delete events in the original Session | Agent-scoped tools checkpoint before reading and after mutations | Stable id, UTC target, `scheduled`/`overdue`, and `session-local` disclosure |
|
||||
| Due while busy | Active create remains in the fold | Owner waits for `whenIdle()`, claims idle maintenance, queues one followup, then appends dispatch | One replayable reminder receipt; model failure does not retract it |
|
||||
| Process stopped or Session cold | Active create remains in persistence | No timer or background scan exists; resume rebuilds the owner | Future target waits again; overdue target is attempted once |
|
||||
| Fork | Parent events remain in the inherited prefix | Child fold starts at `seedLength` | Parent receipt may appear in history, but no parent reminder becomes active child work |
|
||||
| Create and manage | `schedule/change` create/delete in the original Session | Agent-scoped tools checkpoint before reads and after mutations | Stable id, UTC target, state, and `session-local` disclosure |
|
||||
| Due while busy | Active create remains in the fold | Owner waits for idle maintenance, queues one follow-up, then appends dispatch | A later ordinary conversation turn |
|
||||
| Process stopped or Session cold | Active create remains persisted | No timer or background scan; resume rebuilds the owner | Future target waits; overdue target is attempted |
|
||||
| Fork | Parent events remain in the inherited prefix | Child fold starts at `seedLength` | Parent work does not become active in the child |
|
||||
|
||||
### Session log authority and tools
|
||||
### Session-log authority and tools
|
||||
|
||||
The version-1 `schedule/change` stream is the only durable Schedule authority. A create record owns a Session-local, non-reused branded id, the trimmed user prompt, the rule, and its UTC target. Delete and dispatch are terminal transitions. The strict decoder and pure fold reject unknown versions, extra fields, reused ids, and transitions against inactive records. A normal Session folds its complete stream; a fork folds only events at or after `SessionHeader.seedLength`.
|
||||
The version-1 `schedule/change` stream is the only durable Schedule authority. A create record owns a Session-local, non-reused branded id, the trimmed prompt, its rule discriminator, and UTC target. Delete and one-shot dispatch are terminal transitions. The strict decoder and pure fold reject unknown versions, extra fields, reused ids, and transitions against inactive records. A normal Session folds its complete stream; a fork folds only events at or after `SessionHeader.seedLength`.
|
||||
|
||||
The current rule union accepts a non-empty prompt and exactly one selector. `after_seconds` is a positive safe-integer delay whose record is `{ id, kind: 'after', prompt, afterSeconds, scheduledAt }`. `at` is either a strict RFC 3339 date-time with `Z` or a numeric offset, or a structured `{ date, time, time_zone? }` local value; its record is `{ id, kind: 'at', prompt, scheduledAt }`. Both dispatch shapes store only the id because the active record already fixes the occurrence. `every_seconds` and `cron` remain rejected rather than hidden in unused fields. Tool values derive `scheduled` or `overdue` and always include `deliveryMode: 'session-local'`.
|
||||
The current rule union accepts a non-empty prompt and exactly one selector. `after_seconds` is a positive safe-integer delay whose record is `{ id, kind: 'after', prompt, afterSeconds, scheduledAt }`. `at` is either strict RFC 3339 with `Z` or a numeric offset, or structured `{ date, time, time_zone }` with an explicit zone; its record is `{ id, kind: 'at', prompt, scheduledAt }`. Dispatch stores only the id because the active record fixes the occurrence. Tool values derive `scheduled` or `overdue` and include `deliveryMode: 'session-local'`.
|
||||
|
||||
An Agent-scoped FIFO serializes each accepted management transaction and the live owner's due transaction from preflight through any post-append barrier. Every tool operation that reads or decides from the fold first awaits `ctx.sessions.flush(session)`. Create may reject input-shape failures before entering the FIFO; after a successful preflight it allocates an id, appends create, and waits for a second barrier. Delete validates its id before the FIFO, then preflights before deciding whether the id is active and waits for a second barrier only when it appends. List and unknown or finished delete never answer from an unconfirmed live suffix or observe a dispatch before its own barrier. A failed barrier returns `persistence_uncertain` rather than guessing whether an eager write committed.
|
||||
An Agent-scoped FIFO serializes management transactions and the live owner's due transaction from preflight through post-append barriers. Every tool read first awaits `ctx.sessions.flush(session)`. Create rejects input-shape failures before the FIFO when possible, preflights, allocates an id, appends, and checkpoints again. Delete validates its id before the FIFO, preflights before deciding whether it is active, and checkpoints again only after append. List and not-found delete never answer from an unconfirmed live suffix. Failed barriers return `persistence_uncertain` rather than guessing whether an eager write committed.
|
||||
|
||||
Every successful management preflight also asks the live owner to recompute. This closes the recovery path where create appended successfully but its post-append barrier rejected: a later list can confirm the coordinator's retained batch, return the active record, and arm its timer without a Schedule-specific retry loop.
|
||||
Every successful management preflight asks the live owner to recompute. A later list can therefore confirm a retained create after a previous post-append rejection and arm it without a private persistence-retry timer.
|
||||
|
||||
### Session and request time-zone ownership
|
||||
### Explicit absolute-time boundary
|
||||
|
||||
The official Web create path requires the browser's IANA zone, validates and canonicalizes it at the Host boundary, and stores it once as immutable `SessionHeader.timeZone`. Resume preserves that value, fork copies it, and another create for the same id and cwd conflicts when its canonical zone differs. Session core keeps the field optional so pre-zone Sessions remain readable but explicitly `unavailable`; a legacy header is never backfilled from a later browser request. JSONL preserves the optional header, while SQLite schema v14 adds nullable `time_zone` and upgrades an owned v13 database atomically without guessing values for existing rows.
|
||||
Natural-language interpretation and Schedule parsing are deliberately separate ([time-zone simplification](../simplification/2026-08-09-explicit-schedule-time-zone.md)). Each browser prompt carries its Host-validated IANA zone only on that durable user message. Time-context tells the model to assume that zone for otherwise-unqualified dates and times. Schedule neither imports that plugin nor stores a Session zone: the model must turn its interpretation into an offset-bearing RFC 3339 value or a local object with explicit `time_zone`.
|
||||
|
||||
That exact v13-to-v14 transaction is a narrow planned exception to the pre-release default of rejecting old storage formats: valid headerless Session databases can exist before time-zone metadata is introduced. It accepts only the owned v13 layout, rejects older, newer, or spoofed schemas without mutation, and does not establish a general migration framework.
|
||||
|
||||
Every Web prompt samples its own `clientTimeZone`, which the Host validates before Agent entry and binds to that immutable `user-rpc` message source. This is request provenance, not a mutable property of the connection or Session, so concurrent tabs cannot overwrite one another and queue, steering, edit, retry, and persisted history retain the originating zone.
|
||||
|
||||
Time-context delegates through `agent/pre-step`, derives the final non-empty entered batch's zones from the immutable Session header and message-bound browser sources, and appends one model-visible reading to that batch. Its source remains the simple plugin marker; it does not copy those facts into another durable authority. Steering inserted after AgentLoop claims the current batch keeps ordinary next-step ownership and receives fresh context when that step enters. Rejection, an empty decision, cancellation, or failure before `step/start` records no reading, and this feature adds no inbox or AgentLoop lifecycle state.
|
||||
|
||||
Schedule requires a time-context marker in the current open turn, then derives request zones directly from that turn's original `user-rpc` sources. An implicit local `at` is accepted only when that derivation has one client zone equal to the Session zone. A headerless Session, missing or mixed client provenance, or a client/Session mismatch returns `timezone_confirmation_required` with the known zones. An explicit `time_zone` bypasses that ambiguity check but still passes the same IANA validation.
|
||||
|
||||
### Absolute-time normalization
|
||||
|
||||
Schedule, rather than the model or process locale, owns deterministic calendar normalization. Explicit-offset input must match the narrow supported profile and identify a strictly future four-digit-year instant. Structured local input validates the calendar and selected zone, rejects a daylight-saving gap, and chooses the first, earlier instant in an overlap. A successful create stores only UTC `scheduledAt`; the original offset, local fields, and interpreting zone are not a second durable representation. Natural-language interpretation remains the model's job, and time-context appears before the tool call rather than relying on a result echo.
|
||||
|
||||
### Persistence checkpoint and initialization recovery
|
||||
|
||||
`SessionStore.flush()` awaits every scoped listener and treats literal `true` as an explicit durability acknowledgement. An acknowledged call publishes a contained `session/flushed(session, throughSeq)` observation whose exclusive boundary was captured at call entry; append notification itself is not durability evidence. Observe-only listeners return void, an empty or observe-only checkpoint returns `false`, and any listener rejection prevents the success observation after all listeners settle.
|
||||
|
||||
The persistence coordinator supplies that acknowledgement only after its write path is quiescent. Its live controller retains the initial `seedEnd` scalar rather than a seed copy. If the first initialization rejects, a later flush rebuilds that immutable prefix from the append-only Session, reads the backend's actual cursor, and appends only a missing suffix. This covers failures before storage changed and failures reported after a commit, so one transient error neither permanently poisons the Session nor duplicates its prefix.
|
||||
Schedule validates exact calendar shapes, offsets, zone names, and a strictly future four-digit-year instant. A local time inside a daylight-saving gap is rejected; an overlap chooses its first, earlier instant. A successful create stores only canonical UTC `scheduledAt`, not the original offset, local fields, or zone.
|
||||
|
||||
### Live delivery lifecycle
|
||||
|
||||
The Agent-scoped owner derives its earliest target from the durable fold. Long targets use bounded timer segments, and every wake reads the wall clock again, so a rollback cannot fire early and a forward jump becomes overdue. If a turn or another maintenance task already owns the Agent, `runMaintenance()` rejects the claim; the record stays active and one `whenIdle()` wait triggers a later retry. A rejected persistence preflight or contained framing/synchronous-enqueue failure also leaves the record active, but no private retry timer runs; later Agent activity reaching idle or a successful Schedule management preflight asks the owner to try again.
|
||||
The Agent-scoped owner derives its earliest target from the durable fold. Long targets use bounded timer segments, and every wake reads the wall clock again, so a rollback cannot fire early and a forward jump becomes overdue. If a turn or maintenance task owns the Agent, `runMaintenance()` rejects the claim; the record stays active and one `whenIdle()` wait triggers another attempt. A rejected preflight or contained framing/enqueue failure also leaves it active without starting a private retry timer.
|
||||
|
||||
The accepted path first clears pending persistence and claims the true idle phase through `runMaintenance()`. Inside that task it refolds the exact Session suffix so a direct management mutation that won the claim race cannot be followed by a stale dispatch, samples the decision clock once, constructs the complete fixed reminder frame with JSON-escaped id and prompt, synchronously queues one `followup()`, and appends the id-only dispatch. Waking input remains parked until maintenance settles, so the driver cannot claim the message before dispatch enters the log; only after the task releases the phase does the owner wait for the dispatch barrier. A framing or synchronous enqueue failure is contained and appends no dispatch. An append failure faults that owner because the message may already be queued. A later prompt-admission, request-checkpoint, or model failure cannot retract a dispatch.
|
||||
The accepted path clears pending persistence and claims the true idle phase. It refolds the exact Session suffix, samples the decision clock, constructs fixed reminder framing with JSON-escaped id and prompt, synchronously queues one `followup()`, and appends id-only dispatch before releasing maintenance. Waking input remains parked until release, so the message cannot be claimed before dispatch enters the log; afterward the owner checkpoints dispatch.
|
||||
|
||||
Agent or plugin disposal cancels timers, stops new work, unwinds the three tool registrations, and waits for in-flight preflights or idle waits. It never deletes durable records during teardown. The narrow crash interval after synchronous followup admission and before durable dispatch may repeat the reminder after recovery; the design prefers a visible duplicate over silent loss and makes no model-success, user-read, external-effect, or exactly-once promise.
|
||||
|
||||
### Commit-aware Web receipt
|
||||
|
||||
The Schedule package owns `scheduleReminderPresentation()`, which derives `{ scheduleId, prompt, occurrenceAt }` from create plus dispatch; the client renderer adds the fixed `session-local` label. The current fork's `seedLength` is a hard boundary for child-owned dispatches. An inherited dispatch instead pairs with its nearest preceding same-id create because `session/end-seed` also marks replay or resume construction, not only fork ownership. This keeps resumed ancestor receipts renderable, preserves nested-generation id reuse, and never changes live ownership.
|
||||
|
||||
The Host continues to send every raw event on append. It keeps one monotonic watermark per exact live `Session` in a `WeakMap`; only `session/flushed` advancement makes it redeliver newly covered dispatch events with the generic `{ for: 'event', view }` sidecar. The durable `schedule/change` type selects the client renderer. Taking the maximum contains reversed concurrent flush completion, and exact object identity prevents a reused Session id from inheriting another lifecycle's cursor.
|
||||
|
||||
Attached history independently inspects persistence and adds views only to a stored event prefix whose header identity and every event match the live Session. Persistence canonically writes absent top-level `delegationDepth` as zero, so those two forms are identity-equivalent; cwd, lineage, origin, timestamps, version, id, and every event still match exactly. Missing, failed, divergent, or longer inspection withholds the view while returning raw history. Detached history is already a persisted prefix. A parent dispatch copied into a fork seed therefore appears in child history only after child storage proves that prefix.
|
||||
|
||||
The browser Session accepts a repeated seq only when the durable event is deeply identical, then upgrades the sidecar immediately without appending another event. Tail loading and true gap repair retain uncovered events in the existing `liveBuffer`; an accepted repair snapshot starts another pull when it advanced the tail but left a later buffered gap, while an identity conflict triggers a full resync. Ordinary older-page pagination keeps receiving live tail events in the current arrays, while a sidecar below the current window stays with the in-flight page and attaches only when that page returns the identical event. Reconnect generations prevent stale page or repair results and `finally` blocks from touching the rebuilt window. `TranscriptAdapter` creates a generic `PresentedEventNode` keyed by the durable event type. `ui-conversation` dispatches it through `conversation.chat.eventview` and retains an expandable JSON fallback, while `ui-schedule` owns the bilingual `schedule/change` reminder row.
|
||||
|
||||
```text
|
||||
schedule_create → Session create event → persistence
|
||||
↓ live owner
|
||||
due → admission → followup → dispatch → flush(true) → session/flushed
|
||||
↓
|
||||
Host late event sidecar
|
||||
↓
|
||||
client same-seq upgrade → event-keyed UI receipt
|
||||
```
|
||||
Dispatch records queue admission, not model completion or user receipt. Framing or synchronous enqueue failure appends no dispatch. An append failure faults that owner because the message may already be queued. Agent or plugin disposal cancels timers, stops new work, unwinds tool registrations, and awaits in-flight work without deleting durable records. A crash after follow-up admission but before durable dispatch can repeat the reminder after recovery; the design makes no exactly-once promise.
|
||||
|
||||
## Alternatives considered
|
||||
|
||||
**Use `ctx.tasks`.** Tasks own process-local work, terminal outcomes, collection, and notifications rather than Session-log state and replayable conversation receipts. Reusing them would make the wrong lifecycle authoritative.
|
||||
**Use `ctx.tasks`.** Tasks own process-local work, outcomes, and notifications rather than Session-log state and conversation follow-ups.
|
||||
|
||||
**Store reminders in a private SQLite table or global scheduler.** This could run cold Sessions, but requires a second Session identity map, startup scan, ownership lease, crash protocol, and notification policy. The accepted scope deliberately runs only while the original Session is live.
|
||||
**Store reminders in a private database or global scheduler.** This could run cold Sessions but requires a second identity map, startup scan, ownership lease, crash protocol, and notification policy.
|
||||
|
||||
**Claim dispatch before `followup()` or add exactly-once fencing.** A claim-first record can silently lose the user-visible reminder when enqueue fails. Cross-process exactly-once requires a lease, outbox, acknowledgement, and downstream idempotency boundary that Session-local best-effort model work does not provide.
|
||||
**Persist a Session time zone and infer local `at`.** This spreads one interpretive default through Session core, Host create/fork, persistence formats, clients, and mismatch recovery. Request-local model guidance plus an explicit tool boundary deletes that coupling.
|
||||
|
||||
**Treat the model message as the receipt.** The queued inbox item is process-local and may fail before a durable user message exists. A dispatch-derived Web receipt remains visible and replayable independently of model success.
|
||||
**Keep an independent durable Web receipt.** Dispatch is an internal queue fact, not the user's reminder. Rendering the ordinary assistant answer avoids a second delivery meaning and removes Schedule code from Host and client layers.
|
||||
|
||||
**Attach the reminder view on append.** `session/event` precedes the durability result, so this would display a ghost receipt after a rejected flush. The success watermark makes presentation follow the commit point.
|
||||
**Claim dispatch before `followup()` or add exactly-once fencing.** Claim-first can silently lose a reminder when enqueue fails. Cross-process exactly-once needs a lease, outbox, acknowledgement, and downstream idempotency boundary outside this Session-local scope.
|
||||
|
||||
**Add a Schedule-specific wire frame, client cache, or management page.** The generic event sidecar, existing Session window buffer, keyed slot, and model-facing tools already carry the required result. A parallel transport or state store would duplicate identity and replay logic.
|
||||
|
||||
**Adopt existing roots or register global tools.** Late adoption makes plugin load order change which unseen timers begin running and exposes tools outside the supported root-Agent composition. Future-root, Agent-scoped installation gives one clear lifecycle.
|
||||
|
||||
**Use the process zone or the most recently connected browser as the default.** The process zone is deployment state, while a connection-level value lets one tab or a later trip silently reinterpret another request. An immutable Session default plus message-bound client provenance makes disagreement visible without creating shared mutable zone state.
|
||||
|
||||
**Parse arbitrary natural-language dates inside Schedule or persist the local input.** A second language parser would compete with the model, and retaining local text or zone beside the resolved instant would create two durable interpretations of one one-shot target. The model emits a narrow structure after seeing time-context; Schedule validates it and stores one UTC fact.
|
||||
|
||||
The design does not recognize or migrate any unmerged Schedule implementation or private storage format. No fixed Session id, claim-before-send record, startup miss, or private database is a compatibility input.
|
||||
**Adopt existing roots or register global tools.** Late adoption makes plugin load order activate unseen timers and exposes tools outside the supported root composition.
|
||||
|
||||
## Verification
|
||||
|
||||
Package tests pin strict decoding, transitions, fork suffixes, id reuse, offset and local-calendar profiles, IANA validation, gap rejection, overlap-first selection, mismatch confirmation, time bounds, bounded waits, wall-clock movement, overdue admission, fixed framing, enqueue and append failures, barrier recovery, registration rollback, and quiescent disposal at 100% per-file coverage. Persistence tests cover new, fork, and resumed initialization failures against the actual durable cursor, optional header round-trips, a real SQLite v13-to-v14 migration, and a production JSONL restart. The assembled Loader/Web restart lane proves pending recovery, fork isolation, one durable dispatch, cold-history rendering without Agent activation, and no redelivery after another restart. Host/client tests cover zone identity across live, stored, and concurrent-create paths; per-operation prompt provenance; commit gating; reversed watermarks; semantic header identity; per-event prefix matching; same-seq upgrades; every window merge exit; and reconnect generations.
|
||||
|
||||
Time-context tests cover final pre-step messages, current-turn unique/mixed/missing zone derivation, post-claim steering entering the next step, cancellation, empty suppression, retry, exact snapshot-source validation, and in-flight disposal. Schedule tests independently derive the same request zones from durable `user-rpc` sources, reuse a same-turn marker across an empty continuation, and fail closed without an open-turn marker. The opt-in Loader composition boots the source and built packages. Keyless real-browser scenarios execute `schedule_create` through the complete tool pipeline for the existing short `after` case and one absolute-time case, observe the identity-matched persisted prefix, and render the durable reminder card from attached history. The deliberately absent model adapter closes the turn with an error after dispatch, proving that model failure does not remove the receipt.
|
||||
Package tests pin strict replay, transitions, fork suffixes, id reuse, offset and local-calendar profiles, IANA validation, daylight-saving gaps and overlaps, time bounds, timer segmentation, wall-clock movement, overdue admission, fixed framing, enqueue and append failures, barrier recovery, registration rollback, and quiescent disposal at per-file 100% coverage. A production JSONL restart test proves one overdue reminder dispatches through the real Agent lifecycle and does not redispatch after another restart. Host/client tests pin browser-zone sampling and prompt-bound validation. The keyless assembled Web scenario drives a real browser prompt through time-context, a model `schedule_create` call with explicit `time_zone`, durable dispatch, and an ordinary assistant follow-up with no receipt UI.
|
||||
|
||||
## Consequences
|
||||
|
||||
- Reminder state survives process restart and replays through ordinary Session persistence without a new database or public service.
|
||||
- A cold Session does no work and sends no external notification; reopening it may deliver an overdue reminder, and every tool/card says `session-local`.
|
||||
- Each live root adds only fold-derived timers, an optional idle wait, and one in-flight operation. Long waits and plugin unload do not create a second durable state machine.
|
||||
- A Session's default zone is immutable and may remain unavailable for older history. Travel or concurrent tabs can therefore require an explicit zone instead of silently changing the meaning of “tomorrow at 09:00.”
|
||||
- The generic commit-aware event-view path is reusable by other durable events, but it adds event-identity checks and generation-aware merge behavior to the client Session window.
|
||||
- The strict one-shot protocol covers delayed and absolute targets. Recurring rule families still require explicit transition, catch-up, and model-budget semantics rather than dormant fields.
|
||||
- Reminder state survives restart through ordinary Session persistence without a new database or public service.
|
||||
- Cold Sessions do no work and send no external notification; reopening one may deliver overdue work.
|
||||
- Absolute input is deterministic without persistent Session-zone state or a dependency from Schedule to time-context.
|
||||
- Users see normal conversation output; dispatch never overstates model success or acknowledgement.
|
||||
- Each live root adds only fold-derived timers, an optional idle wait, and one in-flight operation.
|
||||
- Recurrence requires explicit transition, catch-up, and model-budget semantics rather than dormant fields; cron remains outside this product boundary.
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
# Agent Note: 持久、仅限 Session 内的 Web 提醒
|
||||
# Agent Note: 持久、仅限 Session 内的提醒
|
||||
|
||||
Status: implemented
|
||||
|
||||
@@ -6,116 +6,70 @@ Status: implemented
|
||||
|
||||
## 问题
|
||||
|
||||
在对话中创建的提醒需要跨进程重启存活，并始终归属于确切的原 Session。进程内 timer 或模型 inbox 项无法提供这种持久性，而全局 scheduler 或私有数据库又会引入第二套身份、持久化和生命周期系统。即使后续 best-effort 模型轮次失败，用户仍需要看到回执；但 dispatch 尚未到达存储的提醒绝不能提前显示。
|
||||
在对话中创建的提醒必须始终归属于确切的那个 Session，并且跨进程重启存活。进程本地 timer 或 inbox 项无法提供这种持久性，而全局 scheduler 或私有数据库又会引入第二套身份、持久化和生命周期系统。
|
||||
|
||||
繁忙的 Agent、长等待、墙钟变化、cold Session、fork、持久化失败和浏览器 history 竞态，使简单 timeout 无法满足要求。设计必须区分持久 record 与可丢弃的 live wait，阻止 fork 继承父 Session 的活动提醒，并合并可能晚于原始 event 到达的 presentation sidecar。
|
||||
繁忙的 Agent（智能体）、长等待、墙钟变化、cold Session、fork、持久化失败、绝对日历输入和资源释放，使简单 timeout 无法满足要求。设计必须区分持久记录与可丢弃的 live wait，阻止 fork 继承父 Session 的活动提醒，并避免把 Schedule 专属的呈现或时区状态扩散到无关组件。
|
||||
|
||||
## 决策
|
||||
|
||||
[`examples/web-schedule`](../../../../examples/web-schedule/README.md) overlay 显式加载 `@deepseek-ai/dsh-time-context`、`@deepseek-ai/dsh-tool-schedule` 与独立 renderer `@deepseek-ai/dsh-client-ui-schedule`。默认 Web 配置树保持不变。Schedule 只观察插件加载后发布的根 Agent，并在该 Agent scope 中安装三个工具和一个可丢弃 owner。cold history 读取、已发布的根、child Agent 与其他宿主都不会激活它。
|
||||
[`examples/web-schedule`](../../../../examples/web-schedule/README.md) overlay 显式加载 `@deepseek-ai/dsh-time-context` 与 `@deepseek-ai/dsh-tool-schedule`；默认 Web 配置树保持不变。Schedule 只观察插件加载后发布的根 Agent，并在该 Agent scope 中安装三个工具和一个可丢弃 owner。cold history 读取、已发布的根、child Agent 与其他 host 都不会激活它。
|
||||
|
||||
用户可见边界固定为 `session-local`：原 Session 只有在 live 时才会准点运行提醒，cold 期间不发送任何外部通知；该 Session 再次 live 后才会处理 overdue 提醒。
|
||||
用户可见边界是 `session-local`：原 Session 只有在 live 时才会准时运行提醒，cold 期间不发送任何外部通知；该 Session 再次 live 后才会处理 overdue 提醒。到期工作会等待 Agent 完全 idle，再通过 `followup()` 进入普通的下一轮队列；它绝不会中途引导当前轮次，也没有独立 Web 回执（[对话式交付](../simplification/2026-08-09-conversational-schedule-delivery.md)）。
|
||||
|
||||
| 场景 | 持久事实 | live 行为 | 用户可见结果 |
|
||||
| --- | --- | --- | --- |
|
||||
| 创建与管理 | 原 Session 中的 `schedule/change` create／delete event | Agent-scoped 工具在读取前、变更后执行 checkpoint | 稳定 id、UTC 目标、`scheduled`／`overdue` 与 `session-local` 说明 |
|
||||
| 到期时繁忙 | 活动 create 仍在 fold 中 | owner 等待 `whenIdle()`、认领 idle maintenance、排入一次 followup，再追加 dispatch | 一条可回放提醒回执；模型失败不会撤回它 |
|
||||
| 进程停止或 Session cold | 活动 create 仍在 persistence 中 | 不存在 timer 或后台扫描；resume 重建 owner | 未来目标继续等待；overdue 目标尝试一次 |
|
||||
| fork | 父 event 留在继承前缀 | child fold 从 `seedLength` 开始 | history 可显示父回执，但父提醒不会成为 child 活动工作 |
|
||||
| 创建与管理 | 原 Session 中的 `schedule/change` create／delete | Agent-scoped 工具在读取前、变更后执行 checkpoint | 稳定 id、UTC 目标、状态与 `session-local` 说明 |
|
||||
| 到期时繁忙 | 活动 create 仍在 fold 中 | owner 等待 idle maintenance，排入一个 follow-up，再追加 dispatch | 后续一个普通对话轮次 |
|
||||
| 进程停止或 Session cold | 活动 create 仍在 persistence 中 | 不存在 timer 或后台扫描；resume 重建 owner | 未来目标继续等待；overdue 目标会被尝试 |
|
||||
| fork | 父 event 留在继承前缀 | child fold 从 `seedLength` 开始 | 父工作不会在 child 中变为活动状态 |
|
||||
|
||||
### Session 日志权威与工具
|
||||
|
||||
版本 1 `schedule/change` stream 是唯一持久 Schedule 权威。create record 拥有 Session 内不复用的品牌 id、trim 后的用户 prompt、规则与 UTC 目标。delete 和 dispatch 是终结 transition。严格 decoder 与 pure fold 会拒绝未知版本、额外字段、重复 id，以及针对非活动 record 的 transition。普通 Session 折叠完整 stream；fork 只折叠 `SessionHeader.seedLength` 位置及其后的 event。
|
||||
版本 1 `schedule/change` stream 是唯一持久的 Schedule 权威。create 记录拥有一个 Session 内不复用的品牌 id、trim 后的提示词、规则判别字段和 UTC 目标。delete 与一次性 dispatch 是终结转换。严格 decoder 与纯 fold 会拒绝未知版本、额外字段、重复使用的 id，以及针对非活动记录的转换。普通 Session 折叠完整 stream；fork 只折叠 `SessionHeader.seedLength` 位置及其后的 event。
|
||||
|
||||
当前规则 union 接受非空提示词与恰好一个 selector。`after_seconds` 是正 safe-integer delay，其 record 为 `{ id, kind: 'after', prompt, afterSeconds, scheduledAt }`。`at` 可以是带 `Z` 或数字 offset 的严格 RFC 3339 date-time，也可以是结构化的 `{ date, time, time_zone? }` local value；其 record 为 `{ id, kind: 'at', prompt, scheduledAt }`。两种 dispatch shape 都只保存 id，因为活动 record 已经唯一确定 occurrence。`every_seconds` 与 `cron` 仍会被拒绝，不会作为未使用字段隐藏在协议中。工具 value 派生 `scheduled` 或 `overdue`，并始终包含 `deliveryMode: 'session-local'`。
|
||||
当前规则 union 接受非空提示词和恰好一个 selector。`after_seconds` 是正的安全整数 delay，其记录为 `{ id, kind: 'after', prompt, afterSeconds, scheduledAt }`。`at` 可以是带 `Z` 或数值偏移量且严格符合 RFC 3339 的值，也可以是带显式时区的结构化 `{ date, time, time_zone }`；其记录为 `{ id, kind: 'at', prompt, scheduledAt }`。dispatch 只保存 id，因为活动记录已经确定 occurrence。工具值派生 `scheduled` 或 `overdue`，并包含 `deliveryMode: 'session-local'`。
|
||||
|
||||
一个 Agent-scoped FIFO 会将每项已接纳的管理事务与 live owner 的到期事务从 preflight 到任何 post-append barrier 全程串行化。每项从 fold 读取或作出判断的工具操作都会先等待 `ctx.sessions.flush(session)`。create 可以在进入 FIFO 前拒绝只依赖输入 shape 的失败；preflight 成功后才分配 id、追加 create，并等待第二个 barrier。delete 在进入 FIFO 前验证其 id，随后在判断 id 是否活动前先 preflight，只有实际追加时才等待第二个 barrier。list 与未知或已终结 delete 绝不会从未确认的 live 后缀作答，也不会在自身的 barrier 前观察到 dispatch。barrier 失败会返回 `persistence_uncertain`，而不是猜测 eager write 是否已经提交。
|
||||
一个 Agent-scoped FIFO 会将管理事务与 live owner 的到期事务从 preflight 到 post-append barrier 全程串行化。每项工具读取都会先等待 `ctx.sessions.flush(session)`。create 会尽可能在进入 FIFO 前拒绝输入形状错误，随后执行 preflight、分配 id、追加记录并再次 checkpoint。delete 会在进入 FIFO 前验证 id，在判断其是否活动前执行 preflight，并且只在追加后再次 checkpoint。list 与 not-found delete 绝不会根据未经确认的 live 后缀作答。barrier 失败会返回 `persistence_uncertain`，而不是猜测 eager write 是否已经提交。
|
||||
|
||||
每次成功的管理 preflight 也会要求 live owner 重新计算。这闭合了 create 已成功追加、但 post-append barrier 拒绝时的恢复路径：后续 list 可以确认 coordinator 保留的 batch、返回活动 record，并在没有 Schedule 私有重试循环的情况下 arm timer。
|
||||
每次成功的管理 preflight 也会要求 live owner 重新计算。因此，如果先前的 post-append 被拒绝，后续 list 可以确认保留的 create 并将其 arm，而无需私有的 persistence 重试 timer。
|
||||
|
||||
### Session 与请求时区归属
|
||||
### 显式绝对时间边界
|
||||
|
||||
官方 Web create 路径要求浏览器提供 IANA 时区，在 Host 边界校验并规范化后，将其一次性存为不可变的 `SessionHeader.timeZone`。resume 保留该值，fork 复制该值；若针对相同 id 与 cwd 的另一次 create 得到的规范化时区不同，则发生冲突。Session core 保持该字段可选，使时区支持前的 Session 仍可读取，但其时区明确为 `unavailable`；绝不会用后续浏览器请求回填 legacy header。JSONL 保留该可选 header；SQLite schema v14 增加 nullable `time_zone`，并以原子方式升级自有 v13 数据库，不为既有行猜测值。
|
||||
自然语言解释与 Schedule 解析被有意分开（[时区简化](../simplification/2026-08-09-explicit-schedule-time-zone.md)）。每条浏览器提示词只在其对应的持久 user message 上携带由 Host 校验过的 IANA 时区。Time-context 会告诉模型，把未明确限定时区的日期和时间解释为该时区。Schedule 既不导入该插件，也不存储 Session 时区：模型必须把其解释结果转换为带偏移量的 RFC 3339 值，或带显式 `time_zone` 的本地对象。
|
||||
|
||||
这笔精确的 v13 到 v14 事务，是对“预发布阶段默认拒绝旧存储格式”立场的一项窄幅、已规划例外：在引入时区 metadata 前，可能已经存在有效的无时区 Session 数据库。它只接受自有 v13 布局；更旧、更新或伪造的 schema 都会在不修改数据的前提下被拒绝，而且不会建立通用迁移框架。
|
||||
|
||||
每条 Web 提示词都会单独采样自己的 `clientTimeZone`；Host 在进入 Agent 前校验该值，并把它绑定到不可变的 `user-rpc` 消息来源。它是请求 provenance，而不是连接或 Session 的可变属性，因此并发 tab 无法相互覆盖，排队、steering（中途引导）、编辑、重试和持久化 history 都会保留来源时区。
|
||||
|
||||
Time-context 会委托 `agent/pre-step`，从不可变 Session header 和与消息绑定的浏览器来源为最终进入的非空批次派生时区，再向该批次追加一条模型可见读数。其来源仍是简单插件标记，不会把这些事实复制成另一份持久权威。AgentLoop 领取当前批次后才插入的 steering（中途引导）保留常规 next-step 归属，并在该步骤进入时获得新上下文。`step/start` 之前出现 reject、空决策、取消或失败时，不会记录读数；本功能也不增加 inbox 或 AgentLoop 生命周期状态。
|
||||
|
||||
Schedule 要求当前 open turn 中存在 time-context 标记，然后直接从该 turn 的原始 `user-rpc` 来源派生请求时区。只有派生结果包含一个与 Session 时区相等的 client 时区，才会接受隐式 local `at`。无 header 的 Session、client provenance 缺失或 mixed，或 client／Session 不匹配，都会返回 `timezone_confirmation_required` 及已知时区。显式 `time_zone` 可绕过这项歧义检查，但仍要通过相同的 IANA 校验。
|
||||
|
||||
### 绝对时间规范化
|
||||
|
||||
确定性的日历规范化由 Schedule 负责，而不是模型或进程 locale。显式 offset 输入必须匹配受支持的窄 profile，并标识一个严格位于未来、年份为四位数的时点。结构化 local 输入会校验日历和选定时区，拒绝夏令时空档，并选择重叠时段中首次出现的较早时点。成功的 create 只存储 UTC `scheduledAt`；原 offset、local 字段和用于解释的时区不会形成第二份持久表示。自然语言解释仍由模型完成，time-context 出现在工具调用之前，而不依赖结果回显。
|
||||
|
||||
### Persistence checkpoint 与初始化恢复
|
||||
|
||||
`SessionStore.flush()` 会等待所有 scoped listener，并把字面量 `true` 视为显式 durability acknowledgement。获得确认的调用会发布受包含的 `session/flushed(session, throughSeq)` observation；其中排他边界在调用入口捕获，append 通知本身不是 durability 证据。仅观察 listener 返回 void；空或只有观察者的 checkpoint 返回 `false`；任一 listener 拒绝都会在全部结算后阻止成功 observation。
|
||||
|
||||
persistence coordinator 只有在写路径完全停稳后才给出该确认。live controller 只保留初始 `seedEnd` 标量，不复制 seed。首次初始化拒绝后，后续 flush 会从仅追加 Session 重建该不可变前缀、读取后端实际 cursor，并只追加缺失 suffix。无论失败发生在存储变更前，还是提交后才返回拒绝，一次暂时性错误都不会永久毒化 Session 或重复写入其前缀。
|
||||
Schedule 会校验精确的日历形状、偏移量、时区名称，以及一个严格位于未来、年份为四位数的时点。落在夏令时缺口内的本地时间会被拒绝；遇到重叠时会选择第一次出现的较早时点。创建成功后只存储规范化后的 UTC `scheduledAt`，不会存储原始偏移量、本地字段或时区。
|
||||
|
||||
### Live 交付生命周期
|
||||
|
||||
Agent-scoped owner 从持久 fold 派生最早目标。超长目标使用有界 timer 分段，每次 wake 都重新读取墙钟，因此回拨不会提前触发，前跳则会形成 overdue。如果 agent 已被某个轮次或另一项 maintenance task 占用，`runMaintenance()` 会拒绝此次认领；record 保持活动，并由一个 `whenIdle()` wait 触发稍后的重试。被拒绝的 persistence preflight 或被收容的 framing／同步入队失败同样会让 record 保持活动，但不会运行私有重试 timer；后续 agent 活动进入 idle，或成功的 Schedule 管理 preflight 会要求 owner 再次尝试。
|
||||
Agent-scoped owner 从持久 fold 派生最早目标。超长目标使用有界 timer 分段，每次 wake 都会重新读取墙钟，因此回拨不会提前触发，前跳则会形成 overdue。如果 Agent 已被某个轮次或另一项 maintenance task 占用，`runMaintenance()` 会拒绝此次认领；记录保持活动，并由一次 `whenIdle()` wait 触发另一次尝试。被拒绝的 preflight 或被收容的 framing／入队失败同样会使记录保持活动，但不会启动私有重试 timer。
|
||||
|
||||
获得准入的路径会先清空 pending persistence，并通过 `runMaintenance()` 认领真正的 idle phase。该任务会重新折叠确切的 Session 后缀，从而确保在认领竞态中胜出的直接管理变更之后不会跟随陈旧 dispatch；随后只采样一次 decision clock，使用 JSON-escaped id 与 prompt 构造完整固定 reminder frame，同步排入一次 `followup()`，再追加只含 id 的 dispatch。触发唤醒的 input 会保持 parked，直到 maintenance 结束，因此 driver 无法在 dispatch 进入 log 前认领消息；只有该任务释放 phase 后，owner 才会等待 dispatch barrier。framing 或同步入队失败会被收容，且不会追加 dispatch。append 失败会使该 owner fault，因为消息可能已经入队。后续 prompt admission、request checkpoint 或模型失败都不能撤回 dispatch。
|
||||
获得准入的路径会刷新所有 pending persistence 并认领真正的 idle phase。它会重新折叠确切的 Session 后缀、采样 decision clock、用经过 JSON 转义的 id 和提示词构造固定提醒 framing、同步排入一个 `followup()`，并在释放 maintenance 前追加只含 id 的 dispatch。触发唤醒的 input 会保持 parked，直到 maintenance 释放，因此在 dispatch 进入日志前，消息不会被认领；随后 owner 会为 dispatch 执行 checkpoint。
|
||||
|
||||
Agent 或插件 dispose 会取消 timer、停止新工作、撤销三个工具注册，并等待进行中的 preflight 或 idle wait。teardown 绝不会删除持久 record。同步 followup 获得准入后、durable dispatch 前的狭窄崩溃窗口可能在恢复后重复提醒；本设计选择可见重复而非静默丢失，不承诺模型成功、用户阅读、外部副作用或 exactly-once。
|
||||
|
||||
### Commit-aware Web 回执
|
||||
|
||||
Schedule package 拥有 `scheduleReminderPresentation()`，从 create 加 dispatch 派生 `{ scheduleId, prompt, occurrenceAt }`。client renderer 会添加固定的 `session-local` 标签。当前 fork 的 `seedLength` 是 child 自有 dispatch 的硬边界。继承的 dispatch 则会与它之前最近的同 id create 配对，因为 `session/end-seed` 也会标记回放或恢复构造，而不仅标记 fork 所有权。这使恢复后的祖先回执仍可渲染，保留嵌套 generation 的 id 复用，并且绝不会改变 live ownership。
|
||||
|
||||
Host 在 append 时继续发送所有 raw event。它在 `WeakMap` 中按 exact live `Session` 保存一个单调 watermark；只有 `session/flushed` 前进时，才会用通用 `{ for: 'event', view }` sidecar 重投新覆盖的 dispatch event。持久 `schedule/change` 类型用于选择 client renderer。取最大值可以收容反序完成的并发 flush，按对象身份键控则阻止复用的 Session id 继承另一个生命周期的 cursor。
|
||||
|
||||
已附加 history 会独立 inspect persistence，只有 stored event prefix 的 header identity 与每个 event 都和 live Session 匹配时才添加 view。persistence 会把顶层缺失的 `delegationDepth` 规范写成零，因此两种形式在身份上等价；cwd、lineage、origin、时间戳、版本、id 与每个 event 仍必须精确匹配。inspect 缺失、失败、分歧或比 live 更长时，只会省略 view，raw history 仍然返回。已分离 history 本身就是持久前缀。因此复制进 fork seed 的 parent dispatch 只有在 child storage 证明该前缀后才会显示。
|
||||
|
||||
浏览器 Session 只有在 durable event 深度一致时才接受重复 seq，随后立即升级 sidecar，不再追加 event。尾部加载与真正的 gap repair 会将尚未覆盖的事件保留在既有 `liveBuffer` 中；已接受的 repair 快照在推进 tail 但仍留下后续已缓冲的 gap 时会启动另一次 pull，身份冲突则会触发全量重新同步。普通旧页分页会让当前数组继续接收 live tail 事件，当前 window 以下的 sidecar 则由 in-flight page 自身暂存，只有该页返回身份完全相同的事件时才附着。重连 generation 会阻止陈旧的 page 或 repair 结果以及 `finally` 块触碰重建后的 window。`TranscriptAdapter` 创建按持久事件类型键控的通用 `PresentedEventNode`。`ui-conversation` 通过 `conversation.chat.eventview` 分发，并保留可展开 JSON fallback；`ui-schedule` 则拥有双语 `schedule/change` 提醒行。
|
||||
|
||||
```text
|
||||
schedule_create → Session create event → persistence
|
||||
↓ live owner
|
||||
due → admission → followup → dispatch → flush(true) → session/flushed
|
||||
↓
|
||||
Host late event sidecar
|
||||
↓
|
||||
client same-seq upgrade → event-keyed UI receipt
|
||||
```
|
||||
dispatch 记录的是队列准入，而不是模型完成或用户收到提醒。framing 构造或同步入队失败不会追加 dispatch。append 失败会使该 owner fault，因为消息可能已经入队。Agent 或插件 dispose 会取消 timer、停止新工作、撤销工具注册，并等待进行中的工作，且不会删除持久记录。follow-up 获得准入后、持久 dispatch 前发生崩溃，可能使提醒在恢复后重复；本设计不作 exactly-once 承诺。
|
||||
|
||||
## 已考虑的替代方案
|
||||
|
||||
**使用 `ctx.tasks`。** Task 拥有进程内工作、终态结果、收集与通知语义，而不是 Session 日志状态和可回放会话回执。复用它会让错误的生命周期成为权威。
|
||||
**使用 `ctx.tasks`。** Task 拥有进程本地工作、结果和通知，而不是 Session 日志状态和对话 follow-up。
|
||||
|
||||
**把提醒存入私有 SQLite 表或全局 scheduler。** 这样可以运行 cold Session，却必须增加第二套 Session 身份映射、startup 扫描、ownership lease、崩溃协议与通知政策。当前范围有意只在原 Session live 时运行。
|
||||
**把提醒存入私有数据库或全局 scheduler。** 这样可以运行 cold Session，却需要第二套身份映射、启动扫描、ownership lease、崩溃协议和通知策略。
|
||||
|
||||
**在 `followup()` 前 claim dispatch，或增加 exactly-once fencing。** claim-first record 会在入队失败时静默丢失用户可见提醒。跨进程 exactly-once 需要 lease、outbox、acknowledgement 与下游幂等边界，而 Session-local best-effort 模型工作不具备这些边界。
|
||||
**持久化 Session 时区并推断本地 `at`。** 这会让一个解释默认值扩散到 Session core、Host create／fork、持久化格式、client 和不匹配恢复中。请求本地的模型指导与显式工具边界消除了这种耦合。
|
||||
|
||||
**把模型消息当作回执。** 已排队 inbox 项是进程内状态，可能在产生持久 user message 前失败。从 dispatch 派生的 Web 回执不依赖模型成功，仍然可见、可回放。
|
||||
**保留独立的持久 Web 回执。** dispatch 是内部队列事实，而不是用户的提醒。渲染普通 assistant 回答既避免了第二种交付含义，也从 Host 与 client 层移除了 Schedule 代码。
|
||||
|
||||
**在 append 时附加提醒 view。** `session/event` 早于 durability 结果；这样会在 flush 拒绝后显示幽灵回执。成功 watermark 让 presentation 服从提交点。
|
||||
**在 `followup()` 前认领 dispatch，或增加 exactly-once fencing。** claim-first 会在入队失败时静默丢失提醒。跨进程 exactly-once 需要 lease、outbox、acknowledgement 与下游幂等边界，超出了此 Session-local 范围。
|
||||
|
||||
**增加 Schedule 专属 wire frame、client cache 或管理页面。** 通用 event sidecar、既有 Session window buffer、键控 slot 与面向模型工具已经能承载所需结果。平行 transport 或状态 store 会重复身份与回放逻辑。
|
||||
|
||||
**接管既有根或注册全局工具。** 晚接管会让插件加载顺序改变哪些不可见 timer 开始运行，并把工具暴露到支持范围之外。只面向未来根、按 Agent scope 安装，提供了单一明确生命周期。
|
||||
|
||||
**将进程时区或最近连接的浏览器用作默认值。** 进程时区属于部署状态，而连接级值会让某个 tab 或后续出行悄然重新解释另一个请求。不可变的 Session 默认值加上绑定到消息的 client provenance，能让分歧显现，而不创建共享的可变时区状态。
|
||||
|
||||
**在 Schedule 内解析任意自然语言日期，或持久化 local 输入。** 另一套语言解析器会与模型竞争，而在已解析时点旁保留 local 文本或时区，会为同一个一次性目标形成两种持久解释。模型看到 time-context 后输出一个窄结构；Schedule 校验它并存储一个 UTC 事实。
|
||||
|
||||
本设计不会识别或迁移任何未合入的 Schedule 实现或私有存储格式。固定 Session id、claim-before-send record、startup miss 与私有数据库都不是兼容输入。
|
||||
**接管既有根或注册全局工具。** 晚接管会让插件加载顺序激活不可见的 timer，并把工具暴露到受支持的根组合之外。
|
||||
|
||||
## 验证
|
||||
|
||||
package 测试以逐文件 100% coverage 固定严格 decoding、transition、fork suffix、id 不复用、offset 与 local-calendar profile、IANA 校验、gap 拒绝、overlap-first 选择、mismatch confirmation、时间边界、有界等待、墙钟变化、overdue 准入、固定 framing、入队与 append 失败、barrier 恢复、注册 rollback 和完全停稳 dispose。persistence 测试依据实际 durable cursor 覆盖 new、fork 与 resumed 初始化失败、可选 header round-trip、一次真实 SQLite v13 到 v14 migration，以及 production JSONL restart。组装后的 Loader/Web restart lane 证明 pending 恢复、fork 隔离、单次 durable dispatch、无需激活 agent 的 cold-history rendering，以及再次 restart 后不重投。Host/client 测试覆盖 live、stored 与 concurrent-create 路径中的 zone identity、逐操作提示词 provenance、commit gating、反序 watermark、语义 header identity、逐 event 前缀匹配、same-seq 升级、每个 window merge 出口和 reconnect generation。
|
||||
|
||||
Time-context 测试覆盖最终 pre-step 消息、当前 turn 的唯一／混合／缺失时区派生、领取后 steering 进入下一步骤、取消、空值抑制、重试、精确 snapshot 来源校验和执行中释放。Schedule 测试会从持久 `user-rpc` 来源独立派生同一组请求时区，在空的续跑中复用同 turn 标记，并在缺少 open-turn 标记时 fail closed。显式 Loader 组合可以启动 source 与 built package。无密钥真实浏览器场景会通过完整工具 pipeline，针对既有的短 `after` case 和一个 absolute-time case 执行 `schedule_create`，观察 identity-matched 持久前缀，并从已附加 history 渲染 durable reminder card。刻意缺少的模型 adapter 会在 dispatch 后以错误关闭 turn，从而证明模型失败不会移除回执。
|
||||
包测试以逐文件 100% coverage 固定严格回放、转换、fork 后缀、id 复用、偏移量与本地日历 profile、IANA 校验、夏令时缺口与重叠、时间边界、timer 分段、墙钟变化、overdue 准入、固定 framing、入队与 append 失败、barrier 恢复、注册 rollback 和完全停稳的 dispose。production JSONL restart 测试证明一条 overdue 提醒会经过真实 Agent 生命周期 dispatch，并且再次 restart 后不会重复 dispatch。Host／client 测试固定浏览器时区采样与绑定到提示词的校验。无密钥组装 Web 场景会驱动一条真实浏览器提示词经过 time-context，发出带显式 `time_zone` 的模型 `schedule_create` 调用，执行持久 dispatch，并产生一个没有回执 UI 的普通 assistant follow-up。
|
||||
|
||||
## 后果
|
||||
|
||||
- 提醒状态通过普通 Session persistence 跨进程重启并回放，无需新数据库或公开 service。
|
||||
- cold Session 不工作、不发送外部通知；重新打开后可能交付 overdue 提醒，且每个工具／卡片都会显示 `session-local`。
|
||||
- 每个 live 根只增加从 fold 派生的 timer、可选 idle wait 与一个 in-flight operation。长等待和插件卸载不会创建第二套持久状态机。
|
||||
- Session 的默认时区不可变，且在较旧 history 中可能始终不可用。因此，旅行或并发 tab 可能需要显式时区，而不是悄然改变“明天 09:00”的含义。
|
||||
- 通用 commit-aware event-view 路径可供其他持久 event 复用，但为 client Session window 增加了事件身份检查与 generation-aware merge 行为。
|
||||
- 严格的一次性协议覆盖延迟目标和绝对时间目标。周期性规则系列仍需要显式 transition、catch-up 与 model-budget 语义，而不是休眠字段。
|
||||
- 提醒状态通过普通 Session persistence 跨重启存活，无需新数据库或公开 service。
|
||||
- cold Session 不工作、不发送外部通知；重新打开后可能交付 overdue 工作。
|
||||
- 无需持久 Session 时区状态或从 Schedule 到 time-context 的依赖，绝对时间输入仍然具有确定性。
|
||||
- 用户看到普通对话输出；dispatch 绝不会夸大模型成功或 acknowledgement。
|
||||
- 每个 live 根只增加从 fold 派生的 timer、可选 idle wait 与一个 in-flight operation。
|
||||
- 周期性规则需要显式的状态转换、追赶和模型预算语义，而不是休眠字段；cron 仍在此产品边界之外。
|
||||
|
||||
@@ -0,0 +1,6 @@
|
||||
# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
|
||||
# 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 .agents/notes/implemented/simplification/2026-08-09-explicit-schedule-time-zone.md
|
||||
2026-08-09-explicit-schedule-time-zone.md: fd8a09df4c6f8b0003e6e01f48510ecb28d7e568
|
||||
2026-08-09-explicit-schedule-time-zone.zh.md: 3a840edda83edf70e65d6acf6a8874d1d47b09b5
|
||||
@@ -0,0 +1,47 @@
|
||||
# Agent Note: Explicit Schedule time-zone boundary
|
||||
|
||||
Status: implemented
|
||||
|
||||
English | [中文](2026-08-09-explicit-schedule-time-zone.zh.md)
|
||||
|
||||
## Problem
|
||||
|
||||
Implicit local `at` input made a browser fact into shared product state. Capturing a default zone on Session creation required new Session headers, create/resume/fork conflict rules, JSONL metadata, a SQLite migration, client creation plumbing, Host comparisons, and Schedule logic coupled to time-context markers. Travel, concurrent tabs, missing provenance, and old Sessions then needed a confirmation protocol merely to decide whether an omitted field was safe.
|
||||
|
||||
Most of that complexity sat outside Schedule. The model already interprets natural language before it calls the tool, so a durable Session default duplicated an assumption instead of strengthening the absolute-time boundary.
|
||||
|
||||
## Decision
|
||||
|
||||
Browser zone is request-local provenance. The Web client samples `Intl.DateTimeFormat().resolvedOptions().timeZone` for every prompt. The Host accepts an optional `clientTimeZone`, validates and canonicalizes `UTC` or an IANA Area/Location at the RPC boundary, and logs it on that exact `user-rpc` message. Invalid values reject prompt admission. Non-browser clients may omit it.
|
||||
|
||||
Time-context derives unique, mixed, or missing browser facts from original user-rpc messages in the open turn. A unique zone formats the clock and tells the model to interpret otherwise-unqualified dates and times in that zone. Mixed or missing provenance tells the model to ask the user. The configured or process zone is only a display fallback and is never presented as user authority.
|
||||
|
||||
Schedule accepts no implicit local zone. `at` is either a strict offset-bearing RFC 3339 string or exact `{ date, time, time_zone }`. The structured form requires its zone even when time-context just showed the model a browser zone. Schedule does not import time-context, inspect user-message provenance, read a Session header, or produce a confirmation error. Its parser validates the explicit value, rejects daylight-saving gaps, chooses the first instant in overlaps, and stores only canonical UTC `scheduledAt`.
|
||||
|
||||
No Session time-zone field, create/resume/fork zone conflict, JSONL header field, SQLite column or migration, connection default, or Schedule-specific Host/client presentation remains. The browser assumption crosses into Schedule only through the model's explicit tool arguments.
|
||||
|
||||
## Alternatives considered
|
||||
|
||||
**Persist the first browser zone as an immutable Session default.** This makes later local input deterministic but spreads ownership across core and persistence, while travel and concurrent tabs still require mismatch handling.
|
||||
|
||||
**Use the most recent browser zone as mutable Session state.** This reduces confirmation prompts but lets one tab silently change another tab's interpretation and makes replay depend on update ordering.
|
||||
|
||||
**Let Schedule inspect the latest time-context message.** A prose snapshot is model-visible evidence, not a typed package seam. Consuming it would couple Schedule to AgentLoop history and duplicate validation against original provenance.
|
||||
|
||||
**Let the Host inject `time_zone` into tool calls.** The Host cannot know which natural-language expression the model interpreted or whether the user named another zone. Rewriting model arguments hides meaning at the wrong boundary.
|
||||
|
||||
**Require the model to ask on every unqualified time.** This is safe but unnecessarily interrupts the common browser-local case. The request-local instruction provides the intended assumption while mixed or missing provenance still asks.
|
||||
|
||||
## Verification
|
||||
|
||||
Host tests pin canonical aliases, omission, and rejection before Agent entry. Client tests pin one browser-zone sample on each prompt. Time-context tests pin unique, mixed, and missing current-turn derivation and exact model policy. Schedule tests pin required `time_zone`, strict offsets, calendar validation, canonical zones, gap rejection, overlap-first selection, and absence of an implicit context path. The assembled Web scenario fixes Playwright to `Asia/Shanghai`, sends through the real composer, observes the same zone in the model request, verifies an explicit local tool call, and snapshots the ordinary reminder response.
|
||||
|
||||
Source audits reject `SessionHeader.timeZone`, persistence `time_zone` columns, confirmation errors, Schedule imports of time-context, and independent receipt machinery.
|
||||
|
||||
## Consequences
|
||||
|
||||
- Browser-local natural language works without a persisted Session-zone subsystem.
|
||||
- Schedule has one explicit, independently testable absolute-time boundary.
|
||||
- Travel and concurrent tabs affect only their own prompts; a turn with mixed provenance asks instead of mutating shared state.
|
||||
- Non-browser clients remain valid but must provide enough natural-language context or explicit tool arguments.
|
||||
- The model may still make an interpretation error; the tool guarantees only that the explicit calendar value is valid and deterministic.
|
||||
@@ -0,0 +1,47 @@
|
||||
# Agent Note: 显式 Schedule 时区边界
|
||||
|
||||
Status: implemented
|
||||
|
||||
[English](2026-08-09-explicit-schedule-time-zone.md) | 中文
|
||||
|
||||
## 问题
|
||||
|
||||
隐式本地 `at` 输入把浏览器事实变成了共享产品状态。在 Session 创建时捕获默认时区，需要增加新的 Session header、create／resume／fork 冲突规则、JSONL metadata、SQLite migration、client 创建 plumbing、Host 比较，以及与 time-context 标记耦合的 Schedule 逻辑。随后，旅行、并发 tab、缺失 provenance 和旧 Session 都需要一套确认协议，仅仅为了判断省略字段是否安全。
|
||||
|
||||
大部分复杂度都位于 Schedule 之外。模型在调用工具前已经解释自然语言，因此持久 Session 默认值只是重复了一个假设，并没有强化绝对时间边界。
|
||||
|
||||
## 决策
|
||||
|
||||
浏览器时区是请求本地的 provenance。Web client 会为每条提示词采样 `Intl.DateTimeFormat().resolvedOptions().timeZone`。Host 接受可选的 `clientTimeZone`，在 RPC 边界校验并规范化 `UTC` 或 IANA Area/Location，再将其记录在确切的那条 `user-rpc` 消息上。无效值会使提示词准入被拒绝。非浏览器 client 可以省略它。
|
||||
|
||||
Time-context 从 open turn 中的原始 user-rpc 消息派生唯一、混合或缺失的浏览器事实。唯一时区会用于格式化时钟，并告诉模型把未明确限定时区的日期和时间解释为该时区。provenance 混合或缺失时，模型会被告知询问用户。配置或进程时区只作为显示 fallback，绝不会被呈现为用户权威。
|
||||
|
||||
Schedule 不接受隐式本地时区。`at` 要么是带显式偏移量且严格符合 RFC 3339 的字符串，要么是精确的 `{ date, time, time_zone }`。即使 time-context 刚向模型展示了浏览器时区，结构化形式仍要求自己的时区。Schedule 不导入 time-context、不检查 user message provenance、不读取 Session header，也不产生确认错误。它的 parser 会校验显式值、拒绝夏令时缺口、在重叠时选择第一个时点，并且只存储规范化后的 UTC `scheduledAt`。
|
||||
|
||||
不再保留 Session 时区字段、create／resume／fork 时区冲突、JSONL header 字段、SQLite column 或 migration、连接默认值，也不再保留 Schedule 专属的 Host／client 呈现。浏览器假设只会通过模型的显式工具参数跨入 Schedule。
|
||||
|
||||
## 已考虑的替代方案
|
||||
|
||||
**把第一个浏览器时区持久化为不可变的 Session 默认值。** 这会使后续本地输入具有确定性，却把归属扩散到 core 和 persistence；旅行与并发 tab 仍然需要不匹配处理。
|
||||
|
||||
**把最近的浏览器时区用作可变 Session 状态。** 这会减少确认提示，却允许一个 tab 悄然改变另一个 tab 的解释，并使回放依赖更新顺序。
|
||||
|
||||
**让 Schedule 检查最新的 time-context 消息。** prose snapshot（文本快照）是模型可见证据，而不是有类型的包 seam。消费它会使 Schedule 与 AgentLoop history 耦合，并针对原始 provenance 重复校验。
|
||||
|
||||
**让 Host 向工具调用注入 `time_zone`。** Host 无法知道模型解释的是哪个自然语言表达式，也无法知道用户是否指定了另一个时区。重写模型参数会在错误的边界隐藏含义。
|
||||
|
||||
**要求模型对每个未限定时区的时间都询问用户。** 这样做是安全的，却会不必要地打断常见的浏览器本地场景。请求本地指令提供预期假设，而 provenance 混合或缺失时仍会询问用户。
|
||||
|
||||
## 验证
|
||||
|
||||
Host 测试固定别名的规范化、可省略行为和进入 Agent（智能体）前的拒绝。client 测试固定每条提示词进行一次浏览器时区采样。Time-context 测试固定当前 turn 中唯一、混合与缺失情况的派生，以及精确模型策略。Schedule 测试固定必需的 `time_zone`、严格偏移量、日历校验、规范时区、缺口拒绝、重叠时选择第一个时点，以及不存在隐式上下文路径。组装 Web 场景把 Playwright 固定到 `Asia/Shanghai`，通过真实 composer 发送提示词，在模型请求中观察同一时区，验证显式本地工具调用，并对普通提醒响应执行 snapshot。
|
||||
|
||||
源代码审计会拒绝 `SessionHeader.timeZone`、persistence `time_zone` column、确认错误、Schedule 对 time-context 的导入，以及独立回执机制。
|
||||
|
||||
## 后果
|
||||
|
||||
- 无需持久 Session 时区子系统，浏览器本地自然语言也能工作。
|
||||
- Schedule 具有一个显式且可独立测试的绝对时间边界。
|
||||
- 旅行与并发 tab 只影响各自的提示词；provenance 混合的 turn 会询问用户，而不是改变共享状态。
|
||||
- 非浏览器 client 仍然有效，但必须提供足够的自然语言上下文或显式工具参数。
|
||||
- 模型仍可能产生解释错误；工具只保证显式日历值有效且具有确定性。
|
||||
Reference in New Issue
Block a user