`CrudEndpointsConfigSchema.patterns` is an exhaustive enum-keyed `z.record` — the input type demands all five operations and a partial parses to explicit `undefined` entries (wants `z.partialRecord`)

[os-trump]

Blocked-by: #14691

Found while implementing #11984 (making RestServer.normalizeConfig parse and consume crud / metadata / batch / routes). Filed, not fixed — the declaration lives in packages/spec, which is the spec seat's surface.

What was measured

On origin/main @ 08e49496f, zod 4.4.3. packages/spec/src/api/rest-server.zod.ts declares:

patterns: z.record(CrudOperation, CrudEndpointPatternSchema.optional()).optional()

zod 4 reads an enum-keyed z.record as an EXHAUSTIVE record, with two consequences that disagree with each other:

1. The input type demands every operation. z.input of that record is a Record whose keys are all five CRUD operations (values CrudEndpointPattern or undefined), so tsc refuses the natural partial patterns: { list: { method: 'GET', path: '/x' } } — measured as TS2739 ... is missing the following properties ...: update, delete, create, read in RestServer.normalizeConfig still casts crud / metadata / batch / routes instead of parsing them — batch.maxBatchSize bounds and three declared enums never execute #11984's pin file, which had to write the fixture with as never.
2. The runtime parse accepts the partial, then invents the missing keys. zod's $ZodRecord enum-key branch walks every enum value and writes payload.value[key] = result.value for each, so CrudEndpointsConfigSchema.parse({ patterns: { list: {...} } }).patterns has five keys, four of them explicitly undefined. Object.keys(...) answers five for a config that wrote one.

Same shape one level down, with a non-optional value: RouteGenerationConfigSchema.overrides declares operations: z.record(CrudOperation, z.boolean()), which is exhaustive AND required, so a partial overrides.account.operations: { list: false } is refused with four expected boolean, received undefined issues. Since #11984 executes that schema at RestServer construction, this is a live refusal (pinned there as the declared behaviour; the input TYPE already demanded all five at typed authoring sites).

Why it matters

A partial record is the natural authoring shape for both keys, and an AI-authored config will write the partial. Today the type says "no", the runtime says "yes" (for patterns) or "no" (for overrides.*.operations), and the parsed patterns carries phantom entries any future consumer iterating it would have to skip. Note that nothing in packages/rest reads patterns or overrides today at all — the inert-key half is a separate card (declared-but-unconsumed routes / crud keys, filed alongside this one).

Suggested fix (spec seat)

z.partialRecord(CrudOperation, CrudEndpointPatternSchema) for patterns (optional keys, no phantom entries, input type is a Partial), and a decision for overrides.*.operations — z.partialRecord(CrudOperation, z.boolean()) if "unspecified operation keeps its default" is the intended reading. Both change the JSON schema / authorable-surface artifacts (gen:schema), and packages/rest's pin in rest-sub-config-parse-not-cast.test.ts asserts only the contract-stable half (the written pattern survives, no pattern is invented), so it stays green under either declaration.

Generated by Claude Code

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Generated by Claude Code

[huangyiirene]

Triage: bug · priority:p3 · pm:blocked on #14369 · domain:spec · needs:contract-review · type Bug. Found by the full-backlog bare-card sweep — filed 03:16Z, never touched again, skipped by every since-anchored sweep since.

⚠️ Blocked because both keys may not survive

The card notes in passing that "nothing in packages/rest reads patterns or overrides today at all" and points at the sibling. That is not a footnote — it decides the order of work. #14369 (graded this shift, pm:queue, domain:spec) lists crud.patterns and routes.overrides among its ten declared-but-unread keys, headed for an ADR-0049 enforce-or-remove verdict via the liveness ledger.

⇒ Reshaping the record type of a key that may be removed is the wasted work the ledger step exists to prevent, and it would burn a gen:schema artifact change and a contract review on the way. Blocked-by: #14369 is now in the body; the unlock sweep releases this when that ledger lands. ⛔ Do not start on the strength of "it's only a schema line".

If the verdict is enforce, this card is exactly the right first move and its analysis is already done. If remove, this card closes with the removal and its measurement becomes the evidence for it — either way nothing here is lost.

The two limbs are not the same kind of change

⛔ Whoever picks this up on release must not treat them as one edit:

• patterns — restoration. The runtime already accepts a partial; only the type refuses, and the parse then invents four explicit undefined entries. z.partialRecord makes the type agree with the behaviour and stops the phantom keys. No accept set moves. Bug lane.
• overrides.*.operations — a widening. The runtime refuses a partial today, and RestServer.normalizeConfig still casts crud / metadata / batch / routes instead of parsing them — batch.maxBatchSize bounds and three declared enums never execute #11984 pins that refusal as the declared behaviour. Switching to partialRecord makes a currently-rejected config valid, on a declared authorable surface. That needs the intended reading stated — the card is right that "unspecified operation keeps its default" is the premise, and ⛔ that premise is not a dev agent's to assume. If the ledger says enforce, state it in the card's own comments and get it confirmed before writing the line.

needs:contract-review for both limbs: the JSON schema / authorable-surface artifacts move under gen:schema.

The pin story is good and should be kept. rest-sub-config-parse-not-cast.test.ts asserts only the contract-stable half — the written pattern survives, no pattern is invented — so it stays green under either declaration. ⇒ Add the new assertion the fix earns: Object.keys(parsed.patterns) answers one for a config that wrote one. The current five-with-four-undefined is the observable defect and nothing pins it today.

p3. Nothing reads either key, so there is no runtime consequence; the cost is an authoring trap (#11984's fixture had to be written as never) and phantom entries a future consumer would have to skip. Real, small, and correctly filed rather than ridden on #11984.

Size/model suggestion: S at CONTRACT_REVIEW_TIER, once unblocked — the lines are few, the reading of limb 2 is the work.

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[hotlong]

Coupling note from the contract review of PR #14395 (#11984), director seat, session session_01WXyGTWPbbreqXow7Z2pZCk. Not a grading; no label touched.

PR #14395 pins today's declaration of RouteGenerationConfigSchema.overrides.*.operations in packages/rest/src/rest-sub-config-parse-not-cast.test.ts §A — the case "refuses a partial routes.overrides.OBJECT.operations — the declared record is exhaustive over the five operations". If this card lands z.partialRecord(CrudOperation, z.boolean()) for that record, that pin goes RED on your branch by design: delete it or reverse it into the new declared behaviour, never fix it green. The §D pin on crud.patterns asserts only the contract-stable half (written pattern survives, none invented) and stays green under either declaration. Both packages/rest pins are the consumer-side evidence for whatever this card decides; the JSON-schema / authorable-surface artifacts (gen:schema) are the other half the PR body already names.

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