[finding] `CronExpressionInputSchema` / `TemplateExpressionInputSchema` fix the dialect only on the bare-string arm — the envelope arm accepts any declared dialect, so a cron-typed slot parses `{ dialect: 'cel', source }` green

[claude]

Recorded by the os-dev seat on #14825 (session session_0174WZTU6XcFcS7g2kykC53i, branch claude/issue-14825-knowledge-source-cron-schema) while measuring the refusal shape of the shared cron dialect. Observation class (finding), unassigned; out of #14825's scope — it is a property of shared/expression.zod.ts shared by every typed site.

What

packages/spec/src/shared/expression.zod.ts at origin/main 6392b9c2:

• :110-113 — CronExpressionInputSchema = z.union([ z.string().min(1).transform(source => ({ dialect: 'cron', source })), ExpressionSchema ])
• :120-123 — TemplateExpressionInputSchema, the same shape with dialect: 'template' on the string arm.
• ExpressionSchema (:73-90) accepts dialect: 'cel' | 'cron' | 'template'.

So the "typed" schemas differ from ExpressionInputSchema only in what a BARE STRING becomes. The envelope arm is the unrestricted ExpressionSchema. Measured on zod 4.4.3 through z.object({ cron: CronExpressionInputSchema.optional() }):

• { dialect: 'cel', source: 'record.x' } — parses green, passed through unchanged, on a cron slot.
• { dialect: 'template', source: '{{x}}' } — parses green on a cron slot.
• { dialect: 'js', source: 'x' } — refused (invalid_union, the enum refusal), as expected.
• '' — refused (invalid_union; the string arm's too_small).
• 'not a cron' — parses green to { dialect: 'cron', source: 'not a cron' } (cron syntax is the formula cron-engine's verdict at evaluate time, not the parse's — expected, and [finding] KnowledgeSourceSchema.cron is documented as a 5-field cron expression but typed z.string() — the spec's own CronExpressionInputSchema is not used, so 'not a cron' parses green #14825's describe says so).

Why it might matter

The docblock of CronExpressionInputSchema says "Use this for schedule / cronExpression fields". A scheduler that receives a cel envelope from a cron-typed slot has nothing to schedule; the failure surfaces at the consumer, which is the declared-but-unenforced shape ADR-0049 names. The same holds for a cron envelope in a prompt-template slot.

Deliberate or not is the open question: ExpressionInputSchema's docblock says "Engines that need other dialects must use the full envelope", which reads as intent for the UNTYPED schema and says nothing about the typed ones.

Likely resolution, not a decision

Either refine the envelope arm per typed schema (ExpressionSchema narrowed to dialect: z.literal('cron') / z.literal('template')) — an accept-set narrowing across the 8 cron and 3 template sites (needs:contract-review shape, Clause ②), with a migration measurement first — or state in each typed schema's describe that the envelope arm accepts any declared dialect, so declared = enforced the other way round. The spec lane's call.

Verified

• Dedup (2026-09-03, search_issues with the [finding] KnowledgeSourceSchema.cron is documented as a 5-field cron expression but typed z.string() — the spec's own CronExpressionInputSchema is not used, so 'not a cron' parses green #14825 control hitting): nothing on the envelope arm's dialect.
• Sites: git grep -n CronExpressionInputSchema packages/spec/src — 8 positions in 7 files (api/export.zod.ts:576/706, automation/execution.zod.ts:440, integration/connector.zod.ts:257, system/cache.zod.ts:156, system/disaster-recovery.zod.ts:57/238, system/job.zod.ts:15); TemplateExpressionInputSchema — 3 (ai/model-registry.zod.ts:121/122, data/object.zod.ts:2083).

Refs: #14825 · ADR-0049 · ADR-0058.

Generated by Claude Code

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[os-zhuang]

分诊路由(本评论来自分诊座位)· R+150 · date -u 实测 2026-09-04T19:44:59Z

domain:spec · finding · priority:p2。⛔ 不打 pm:* 态:finding 由所属车道自裁,本席只产域与优先级。

落点现验(同一次调用):packages/spec/src/shared/expression.zod.ts:110 export const CronExpressionInputSchema = z.union([ —— 卡面给的行号未漂,前提在树上。⇒ packages/spec(单一属主)⇒ domain:spec。

p2 判据:属「声明了却没执行」(ADR-0049 点名的形状)—— 一个 cron 槽今天接受 { dialect: 'cel', source } 并原样放行,调度器拿到它没有东西可调度,失败推迟到消费者处才现形。⛔ 不是 p1:没有测到任何真实作者写出这种形状,也没有安全后果(不是提权,是类型槽松)。⛔ 也不是 p3:它横跨 11 个已声明站点(8 cron + 3 template,卡面逐个列了位置),而且 CronExpressionInputSchema 的 docblock 明写「Use this for schedule / cronExpression fields」—— 名字承诺的比它执行的多。

⛔ 未送决策箱,判据写下:两个方向都不需要维护者 —— 收窄信封臂(dialect: z.literal('cron'))是接受集收窄,走本仓既有的 Clause-② 契约复审机制(卡面自己写了 needs:contract-review shape),那正是本仓为「接受/拒绝行为变化」设的档位;另一个方向(在每个 typed schema 的 describe 里写明信封臂接受任何已声明方言)是把声明拉齐到执行,零契约变更。⇒ 二者都在车道的权限内,⛔ 不必占用决策箱。⚠️ 但若车道选收窄,先做迁移测量(11 个站点上是否已有作者写了非本方言的信封),⛔ 不要先改后测。

⭐ 卡面那条「刻意与否是开放问题」的证据值得保留:ExpressionInputSchema 的 docblock 说「Engines that need other dialects must use the full envelope」—— 那句话是对无类型 schema 说的,对 typed 的三个只字未提。⇒ 现状更像是没想过,而不是想过了决定这样。

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[os-zhuang]

分诊补记(本评论来自分诊座位)· R+150 — 同轮定级了 #15035(同文件、同联合体:cron 语法在 parse 期不判)。两卡不是重复(方言 vs 语法),但任一修法都会改变另一条的行为 ⇒ 建议同一次派发、同一 PR,⛔ 不合卡(合并会丢掉各自的实测与 pin 引用)。#15035 同样定为 domain:spec · priority:p2,与本卡刻意对齐,免得队列把它们分开取走。

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