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Add design-system tier-limit gating and 402 handling - #5285

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@liamdebeasi liamdebeasi commented Sep 17, 2026

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Summary

Adds a shared client/server contract for Design System Indexing (DSI) tier limits and wires it into the Design and Slides templates so users are blocked (with actionable upgrade CTAs) both proactively when at their plan's cap and reactively when a create is rejected with HTTP 402.

Problem

Non-Enterprise plans can now create a limited number of design systems, and /design-systems/v1/index can reject over-cap creates with a 402. The Design and Slides UIs had no way to surface that limit before or after the fact — users could open the create flow and hit a generic failure with no explanation or upgrade path, and code/repo indexing (Enterprise-only) wasn't disabled for lower tiers.

Solution

Introduced a typed client for reading Builder's /design-systems/v1/tier-limit endpoint and for parsing structured 402 failures from the create/index call, then used it to gate the "new design system" entry points and code-indexing option in both templates, with localized error/upgrade messaging.

Key Changes

  • packages/core/src/server/builder-design-systems.ts: new fetchBuilderDesignSystemTierLimit() reading plan/current/max/codeIndexingAllowed from /design-systems/v1/tier-limit (fails open with status: "unavailable" when unreachable); assertBuilderDesignSystemIndexOk now parses 402 responses into a structured design_system_tier_limit_exceeded action error with plan/current/max/upgradeUrl details; new designSystemTierUpgradeUrl() fallback link.
  • packages/core/src/client/design-system-tier-limit.ts (new): shared client contract exposing DesignSystemTierLimit/DesignSystemTierLimitFailure types, readDesignSystemTierLimitFailure() to extract 402 failures from thrown action errors, and isDesignSystemTierAtMax() helper. Exported via @agent-native/core/client/design-system-tier-limit.
  • templates/design/actions/get-design-system-tier-limit.ts and templates/slides/actions/get-design-system-tier-limit.ts (new): read-only GET actions exposing the tier-limit check to the client.
  • templates/design/app/pages/DesignSystems.tsx: proactively queries the tier limit, prevents navigating to the create flow when at max, and shows an alert dialog with plan/count messaging and an upgrade link instead.
  • templates/design/app/pages/DesignSystemSetup.tsx: shows a full-page "limit reached" state with upgrade CTA when at max; surfaces structured 402 failures (with upgrade link) on create errors; disables the "code" source choice when codeIndexingAllowed is false.
  • Added i18n strings (designSystems.tierLimit*, designSystemSetup.codeIndexingEnterpriseOnly) across all locales in both templates (zh-TW included for Slides).
  • Added tests in packages/core/src/server/builder-design-systems.spec.ts covering 402 handling on create (with/without an upgradeUrl in the body), and fetchBuilderDesignSystemTierLimit behavior for standard plans, unlimited/Enterprise plans, and unreachable-endpoint fallback.

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To clone this PR locally use the Github CLI with command gh pr checkout 5285

You can tag me at @BuilderIO for anything you want me to fix or change

@builder-io-integration builder-io-integration Bot changed the title Update from the Builder.io agent Add design-system tier-limit gating and 402 handling Sep 17, 2026
@liamdebeasi
liamdebeasi marked this pull request as draft September 17, 2026 20:13

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Builder reviewed your changes and found 5 potential issues 🔴

Review Details

Code Review Summary

PR #5285 adds a shared Builder DSI tier-limit contract, exposes it through Design and Slides actions, and updates the Design template with proactive quota gating, reactive 402 upgrade messaging, and code-indexing entitlement UI. The server parsing and focused unit coverage are a good foundation, and the fallback upgrade CTA is tested. This is standard risk because it changes shared API/business logic and multiple user-facing creation flows.

Key Findings

  • 🔴 HIGH — The Design template passes an unsupported locked prop to SourceChoice, producing a TypeScript build error and not actually enforcing the code-source lock.
  • 🟡 MEDIUM — Slides adds the action and translations but does not integrate the tier-limit query or 402 handling into any creation flow.
  • 🟡 MEDIUM — The Figma upload/index path still collapses structured 402 failures into a plain error, losing the upgrade CTA.
  • 🟡 MEDIUM — The new public core export lacks a changeset.
  • 🟡 MEDIUM — Entitlement fallback behavior permits code indexing when the tier response is unavailable or uses an unrecognized plan, contrary to the Enterprise-only policy; upstream upgrade URLs are also rendered without validation.

🧪 Browser testing: Attempted full verification after confirming the dev server was healthy, but all 15 planned cases were couldnt_verify because browser automation tools were unavailable environment-wide. Source inspection and typecheck independently confirmed the locked prop build failure.

title={t("designSystemSetup.sections.code.title")}
selected={sourcePanel === "other" && otherSource === "code"}
onClick={() => selectOtherSource("code")}
locked={!codeIndexingAllowed}

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🔴 Code-source lock prop is not supported by SourceChoice

SourceChoice only declares icon, title, selected, and onClick, so passing locked causes a TypeScript excess-property error and blocks the Design template build. Even if the type were widened, the component currently does not disable or otherwise prevent selecting the locked source; add the prop behavior or gate this call site with a supported implementation.

Additional Info
Reported independently by 3/3 code-review agents and confirmed by source-level typecheck.

Fix in Builder

schema: z.object({}),
readOnly: true,
http: { method: "GET" },
run: async () => fetchBuilderDesignSystemTierLimit(),

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🟡 Slides tier-limit action is never integrated into creation flows

The action is added, but Slides clients do not query it or consume readDesignSystemTierLimitFailure; the list, setup dialog, and new-deck reference flow still submit the old create/index path. Users at the cap can receive the generic failure and non-Enterprise users can still select code/GitHub indexing, contrary to the PR's stated cross-template behavior.

Additional Info
Reported independently by 3/3 code-review agents.

Fix in Builder

);
}

function designSystemIndexFailureMessage(

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🟡 Figma indexing drops structured tier-limit failures

The new structured failure helper is used for the GitHub and design.md mutations, but the primary Figma upload/index path still converts the response to a plain Error and catches it without readDesignSystemTierLimitFailure. If the proactive check is unavailable or the quota changes mid-flow, the user loses the 402 metadata and actionable upgrade link.

Additional Info
Reported by 1/3 agents; confirmed by tracing the Figma upload helper and catch path.

Fix in Builder

"./client/collab": "./dist/client/collab/index.js",
"./client/composer": "./dist/client/composer/index.js",
"./client/conversation": "./dist/client/conversation/index.js",
"./client/design-system-tier-limit": "./dist/client/design-system-tier-limit.js",

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🟡 public core export has no changeset

This adds a new public @agent-native/core/client/design-system-tier-limit export, but the PR contains no .changeset/*.md. Since packages/core is publishable, the required changeset check will fail and the export will not receive a versioned release.

Additional Info
Reported by 1/3 agents; repository guidance requires changesets for publishable core changes.

Fix in Builder

current: null,
max: null,
atMax: false,
codeIndexingAllowed: true,

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🟡 Unavailable tier responses fail open for Enterprise-only code indexing

Non-2xx and network-error paths return codeIndexingAllowed: true, while the UI treats unavailable status as permission to choose code/GitHub sources. Unknown entitlement should be represented separately or code indexing should remain blocked until the capability is known; non-code creation can still remain available.

Additional Info
Reported by 1/3 agents; based on the explicit Enterprise-only policy and the client gate at `status !== "ok"`.

Fix in Builder

@liamdebeasi

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@builderio-bot look at latest PR feedback and fix anything you agree with. Be skeptical. Reply to every comment (directly on the comment thread of each comment) if you fixed it or not and why

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There was a problem with your request, please try again later. Error id: 34415d5dbf3a405bb052dba7d7f9322e

@liamdebeasi

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@builderio-bot Try again

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PR Feedback - Fixes Summary

I've fixed the 3 valid feedback items and verified the 2 stale comments. Here's the status:

Valid Feedback (Fixed)

1. Figma indexing drops structured 402 tier-limit details

  • Added class in to preserve and
  • Updated handler to forward , , and from
  • Fixed Figma error catch in to display tier-limit errors in the box (where upgrade link renders)
  • Added test verifying Figma 402 surfaces upgrade link
  • Verified Design tests: 4 passed

2. Public core export lacks a changeset

  • Added documenting the new export
  • Verified core build and tests: 40 passed

3. Unavailable tier responses fail open for Enterprise-only code indexing

  • Changed server to return (fail closed) on unavailable tier-limit responses
  • Added helper for safe evaluation (only true when status is 'ok' AND flag is true)
  • Updated Design and Slides to use the new helper instead of fail-open logic
  • Updated tests to verify code indexing fails closed on unavailable endpoints
  • Verified core tests: 40 passed

Stale Feedback (No Action Needed)

Comment: Design SourceChoice doesn't support locked prop

  • ✓ Already implemented in current source - supports prop, renders lock icon, and shows Enterprise-only messaging

Comment: Slides tier-limit action never integrated

  • ✓ Already integrated - queries action and uses and code-indexing checks

Verification

  • ✓ Core build: success
  • ✓ Core tests: 40 passed (tier-limit server + client tests)
  • ✓ Design tests: 4 passed (tier-limit gating tests)
  • ✓ Typecheck: no new errors

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