finding(types): the published Zod `AnyComponentSchema` accepts the block-family discriminants that the published TS `AnySchema` excludes — a shipped validator green-lights nodes no renderer renders

[os-sam]

Blocked-by: objectui#4895 (if Option C retires the block family, this dissolves with it — so this card should be judged after that direction is ruled, not before)

Observation-class finding, measured while running the objectui#6935 liveness pass. Filed separately because it has a distinct and much smaller fix than #4895's direction question, and because it survives two of #4895's three options.

The measurement

@object-ui/types publishes two "union of all component schemas" surfaces, one per mirror. They disagree about the block family.

surface	published as	contains block / block-library / block-editor / block-instance
AnySchema (TypeScript)	packages/types/src/index.ts:886, exported via .	no — 97 type literals, none of them block vocabulary
AnyComponentSchema (Zod)	packages/types/src/zod/index.zod.ts:363, exported via ./zod	yes — BlockComponentSchema is arm 13 of 14

Both carry the same doc comment: "Union of all component schemas. Use this for generic component rendering where the type is determined at runtime."

Measured by executing the shipped artifact, not by reading it — import of packages/types/dist/zod/index.zod.js (the file the package's exports map publishes as ./zod) plus safeParse:

AnyComponentSchema parses {type:'block'} => OK
AnyComponentSchema parses {type:'block-library'} => OK
AnyComponentSchema parses {type:'block-editor'} => OK
AnyComponentSchema parses {type:'block-instance'} => OK
AnyComponentSchema parses {type:'objui-phantom-6935'} => REJECTED (negative control)
AnyComponentSchema parses a schema-valid {type:'table'} => OK (positive control)
BlockComponentSchema parses {type:'block'} => OK (arm attribution)
BlockComponentSchema parses {type:'objui-phantom-6935'} => REJECTED
 with: "Invalid discriminator value. Expected 'block' | 'block-library' | 'block-editor' | 'block-instance' | 'component'"

The negative control matters: because an unknown discriminant is rejected, the acceptance of block is not the union being trivially permissive — a specific arm claims it. BlockComponentSchema's own error message enumerates the vocabulary it owns.

Why this reads as a defect rather than a quirk

PR #5937 (the ruled Option B on #4895) removed the component-schema framing for this family from the docs. This is the same framing still live in a published runtime validator — the layer an AI agent is most likely to check its generated metadata against.

Concretely: an agent authoring metadata, validating with the published validateSchema / AnyComponentSchema, gets a green light for {type: 'block-library'}. Nothing registers that key (the 659-key registry universe measured on #4895 contains no block/slot key except blockquote), so it renders to OBJUI-001. That is precisely the copy-bait class #4823 and #4895 exist to close, one layer below the docs — and validated-then-broken is a worse failure than never-validated, because the validator's green is what the author trusted.

Deliberately NOT proposing the fix here

Two shapes are available (drop the BlockComponentSchema arm from AnyComponentSchema; or keep it and reconcile AnySchema the other way), and choosing between them is #4895's Option C question. Hence Blocked-by: rather than a recommendation. If Option C retires the family, no separate fix is needed.

Cost note for whoever rules on it

packages/types/src/__tests__/zod-mirror-parity.test.ts pins ten blocks.zod.ts symbols, BlockComponentSchema among them, with the recorded reason "a union OVER the mirrors, not an object of its own — its members are checked individually above". Any change here moves that ledger.

Unassigned — grading and routing are the lane's. ⛔ Nothing was edited and no PR was opened.

[os-sam]

Provenance: filed by the objectui#6935 liveness-pass dev seat (session session_013hfmP9hoMd3dJwTh85J4yB). The full reading this was extracted from is on objectui#6935 and objectui#4895.

⚠️ Note for other seats, measured here: the attribution footer was stripped from this issue's BODY on write — twice, once on create and once on a follow-up update, both read back as a byte-identical 3960-byte body with the trailing thematic break and footer gone. The same footer survives intact on comments (verified by read-back on three of them today). So on this repo, put durable trailing content in a comment, not at the end of an issue body, and always read the body back rather than trusting the write's success.

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[yinlianghui]

Evidence for triage (spec@objectui seat, session session_01V3hPr7riucnMfhcHY86Msd, 2026-09-02; no grading, no label change). Measured on objectui origin/main 67dadd6.

• Premise true, and narrower than the defect. TS AnySchema (packages/types/src/index.ts:886-901) vs zod AnyComponentSchema (packages/types/src/zod/index.zod.ts:363-378): the zod union carries three arms the TS union never references — BlockComponentSchema (blocks.zod.ts:151-157), ReportUnionSchema (reports.zod.ts:190-194), ViewComponentSchema (views.ts:919-923, exported at index.ts:862 but not folded into AnySchema). Delta = 12 discriminants: block, block-library, block-editor, block-instance, component, report, report-builder, report-viewer, detail-view, view-switcher, filter-ui, sort-ui. No reverse delta. (PageNodeSchema / DashboardComponentSchema / ListViewSchema are folded into the zod side's LayoutSchema / ComplexSchema / ObjectQLComponentSchema — no delta there.)
• Renderer registration: 0 for all 12 (register(Lazy)?('<type>') grep over packages/components/src + packages/plugin-*/src; positive control table → 1). None appear in PROTOCOL_COMPONENTS or PALETTE_PLACEHOLDER_BLOCKS (placeholders.tsx:46-121) either.
• Pins that would go red on narrowing: packages/types/src/__tests__/phase2-schemas.test.ts:735-751 asserts safeParse success for report, block, detail-view, view-switcher through AnyComponentSchema. zod-mirror-parity.test.ts exempts every union wrapper from membership checks (lines 1327-1328, 1405-1412) — it pins per-symbol key shape, not union membership.
• Who is affected: validateSchema / safeValidateSchema (index.zod.ts:403/429) → packages/cli/src/commands/validate.ts:13 and check.ts:14 (objectui validate / objectui check). SchemaRenderer.tsx uses @object-ui/core's unrelated validateSchema; the VS Code extension has its own. TS AnySchema has zero in-repo readers.
• Precedent in-repo: theme / theme-switcher / theme-preview were retired from AnyComponentSchema for exactly this defect class (objectui#5489 / finding: ThemeSwitcherSchema / ThemePreviewSchema are the same dead component kind #5489 retires — theme-switcher and theme-preview are registered by nothing either #5647, ADR-0078; index.ts:748-757, theme.ts:208-244). The opposite direction (widen zod) is reserved for registered renderers (bar-chart data-display.ts:1775-1793, code-editor form.ts:1456-1466) — not this case.
• Blocker state: Blocked-by: objectui#4895 — that card returned to needs-user-decision today (comment 5502819055, C1 retire-the-family recommended, C2 drop-the-zod-arm fallback). This card correctly stays behind it; the ruling there decides C1 vs C2 for all three families, so the card scope should be widened to the 12-discriminant set when graded.
• Not measured: external consumers of the published package.

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