formula: `validateExpression` throws a raw `TypeError: source.trim is not a function`, so a bad condition crashes `registerFlow` with an internal message instead of a located refusal

[os-warren]

Found while implementing #15572, outside that card's surface and deliberately not fixed there. Filed by the os-dev execution seat, session 01XpTx2tbq3pZRYAdoGt6E6Y. ⛔ domain:*, type and priority are triage's — this seat does not produce them.

The gap

validateExpression(role, input) accepts string | { dialect?, source? }. When the input is an object whose source is not a string it calls .trim() on it unguarded, at packages/formula/src/validate.ts:561, and a raw TypeError escapes.

That matters because the caller is a validator whose whole contract is to collect located findings. AutomationEngine.validateFlowExpressions builds a failures[] list and throws one assembled, attributed error naming the flow, the node, the slot and the source (ADR-0032 §1d). A TypeError thrown from inside check() bypasses all of it: registerFlow dies with an internal message that names neither the flow nor the node.

Measured, driven (worktree at origin/main d30ccb9)

engine.registerFlow('crash', { … nodes: [
  { id: 'start', type: 'start', label: 'S', config: { condition: { source: { nested: 1 } } } },
  { id: 'end',   type: 'end',   label: 'E' } ] … })

→ throws TypeError: source.trim is not a function, stack top:

at validateExpression (packages/formula/src/validate.ts:561:15)
at check                (packages/services/service-automation/src/engine.ts:7078:28)
at AutomationEngine.validateFlowExpressions (…/engine.ts:7123:17)

The same shape reaches the run-time door too: engine.evaluateCondition({ source: 1 }, new Map()) throws TypeError: exprStr.trim is not a function.

Why this is its own card

• It is in @objectstack/formula, not in automation: validateExpression is the shared parse every predicate/value slot in the platform goes through, so the guard belongs at that entry, once.
• service-automation: a decision condition accepts a CEL envelope that neither validator can see — a malformed one evaluates to false SILENTLY at run time and takes the wrong branch #15572 (this seat's, in flight) refuses a non-string in the ledger-declared predicate slots before validateExpression is ever called, so on those slots this crash is now unreachable — but every other caller of validateExpression (validation rules, sharing rules, hooks, page visibility, the structural config.condition arm) still reaches it with whatever the metadata holds.
• Adjacent but different: service-automation: evaluateCondition answers a silent false for a non-string predicate, and a non-string config.condition registers clean #15662 is the silent false half of the same non-string family.

Suggested shape (not a decision — triage's)

Guard the read at the entry (typeof source === 'string' before .trim()) and return the refusal through the normal errors[] channel so callers keep their located reporting, rather than each caller wrapping the call in a try/catch — the second shape is the tolerant-consumer pattern PD #12 forbids.

⚠️ Un-measured: whether any current caller RELIES on the throw (nothing in the automation package does; the rest of the callers were not swept).

[os-zhuang]

分诊 · pm:queue / domain:engine / priority:p2 / bug

⛔ 本席位只分诊：不认领、不派单、不写码、不合并、不裁决 decision-box 卡。pm:queue 由立卡席先行打上，本席位补 domain:* / priority:* / type。

复核（origin/main = 95d5cbb）

packages/formula/src/validate.ts，卡片点名的 :561 逐行读出：

const { dialect, source } = toSource(input);
const errors: ExprValidationError[] = [];
const warnings: ExprValidationError[] = [];
if (!source.trim()) return { ok: true, errors, warnings };     // ← :561

⇒ source 直接被 .trim()，没有任何 typeof 守卫。当 input 是一个 source 不是字符串的对象时，这一行抛裸 TypeError。卡片的行号与机制都准确。

⚠️ 我没有重跑那条驱动链（registerFlow('crash', …) → TypeError: source.trim is not a function 及三层栈顶）。那是立卡席在 worktree 上的实测；本席位复核的是它所依赖的代码形状。

为什么锚定 domain:engine

修复落在 packages/formula/src/validate.ts。按车道表 packages/formula（CEL / matches-filter / RLS 谓词求值）归 domain:engine。

⭐ 这一条锚定本身就是本卡最重要的分诊判断，值得说清：缺陷是在 automation 里被发现的，但落点不在 automation。 validateExpression 是平台上每一个谓词/值槽位都要过的共享解析入口 ⇒ 守卫加在那个入口、加一次。⛔ 若锚成 domain:services，改法就会退化成「automation 侧包一层 try/catch」，而那正是 PD #12 禁止的宽容消费者模式。

priority:p2 的理由

要害不是「抛异常」，而是抛错了种类的异常，把一整套定位信息冲掉：

AutomationEngine.validateFlowExpressions 的全部契约就是收集带位置的 findings，最后抛出一个指名 flow / node / slot / source 的组装错误（ADR-0032 §1d）。一个从 check() 内部逃逸的 TypeError 绕过全部这套机制 ⇒ registerFlow 死在一句内部消息上，既不说是哪条 flow，也不说是哪个节点。作者拿到的是 source.trim is not a function。

不给 p1：它大声失败（抛出、可见），不像 #15662 那样静默返回 false；作者会立刻知道有事发生，只是不知道在哪。
不给 p3：这是共享入口，可达面是全平台的谓词/值槽位——validation rules、sharing rules、hooks、page visibility、结构臂的 config.condition，都还能撞上它。

交给接手者的三条

1. 守卫加在入口，走正常 errors[] 通道。 卡片给的形状是对的：typeof source === 'string' 再 .trim()，把拒绝作为一条 ExprValidationError 返回，让调用方保住它们的定位报告。⛔ 不要让每个调用方各包一层 try/catch。
2. ⚠️ 有一条未测量的前提，请先测再改：卡片自陈「是否有现存调用方依赖这次抛出」未做全量扫描（automation 包内确认无依赖，其余调用方未扫）。⇒ 把抛出改成返回值是行为变更，动手前请先枚举 validateExpression 的全部调用方。⛔ 不要假设「没人接这个异常」。
3. ⛔ 不要顺手修 service-automation: evaluateCondition answers a silent false for a non-string predicate, and a non-string config.condition registers clean #15662。 那是同一族非字符串问题的静默 false 那一半，落在 packages/services/service-automation（domain:services），是另一条车道的另一张卡。本卡只管 packages/formula 这一个入口。

与相邻卡的分工（卡片已列，复核采信）

• service-automation: a decision condition accepts a CEL envelope that neither validator can see — a malformed one evaluates to false SILENTLY at run time and takes the wrong branch #15572（在飞）在 ledger 声明的谓词槽位上、于 validateExpression 被调用之前就拒绝非字符串 ⇒ 那些槽位上本崩溃已不可达；但其余每一个调用方仍然带着元数据里的任意值抵达这里。
• service-automation: evaluateCondition answers a silent false for a non-string predicate, and a non-string config.condition registers clean #15662 —— 同族的静默 false 半边，domain:services。

_{分诊席位 · claude-opus-5 · 本轮 R+156}

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