feat(usage): show ChatGPT credit balances for Codex

[rohan-patnaik]

Problem

Usage → Limits can show 0% Codex allowance left even when the ChatGPT account still has spendable credits. T3 currently drops that balance from the Codex response.

Closes #17704.

Change

Show a small “ChatGPT credits” card below the Codex allowance cards in web/desktop and mobile, using the existing page styles. The value stays separate from plan percentages and earned reset credits. Missing balances, unlimited accounts and zero balances have distinct labels.

Carry the balance through the existing probe and live-update paths. Preserve it across window-only updates, honor explicit clears across environments, and discard old usage when an account changes. Account grouping follows the existing Usage identity rules. This only displays reported credit units; billing, spending, routing and reset behavior are unchanged.

Scope and approval

This implements the proposal in #17704. Maintainer approval of the feature direction is still pending. I am submitting the focused implementation and screenshots for consideration.

Verification

• 91 focused tests pass across the Codex mapper, usage-update merging, managed-provider refresh, account aggregation and Usage page refresh. Five new regressions fail against the original mapper/update implementation; three account-switch/clear regressions fail before the review fixes.
• Web and server typechecks, scoped lint, formatting and diff checks pass. Independent review approved 92a3f2be4.
• In the isolated web app, Refresh changes the synthetic balance from 12,345.68 to 42 while the allowance stays at 0%. Checked light/dark themes and a 390px viewport.
• Reused existing dependencies; no fresh frozen-lock install. Native device access is disabled in this environment, so the React Native view has not had a runtime check.

The screenshots use synthetic data. Before uses the upstream Usage component; after uses this change with the same fixture.

Before	After

Dark theme and narrow web layout

Model: GPT-6-Astra (high). Harness: Codex in T3 Code.

[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This PR adds a new ChatGPT credit-balance capability across Codex parsing, live updates, shared account aggregation, and web/mobile Usage views. Because it changes shared runtime data flow and existing refresh behavior across multiple packages, the scope warrants human review.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

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📥 Commits

Reviewing files that changed from the base of the PR and between e0f3e51 and 7bce616.

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📒 Files selected for processing (2)

• packages/shared/src/usageLimits.test.ts
• packages/shared/src/usageLimits.ts

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🚧 Files skipped from review as they are similar to previous changes (2)

• packages/shared/src/usageLimits.test.ts
• packages/shared/src/usageLimits.ts

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📝 Walkthrough

Walkthrough

Codex credit data now passes through usage contracts, server mapping, and account aggregation. Web and mobile Usage Limits views show reported credit balances separately from plan allowance and reset credits.

Changes

Codex credit balance display

Layer / File(s)	Summary
Credit contract and Codex mapping packages/contracts/src/providerUsageLimits.ts, apps/server/src/provider/codexUsageLimits.ts, apps/server/src/provider/codexUsageLimits.test.ts	Usage limits and updates accept optional credit data. Codex mapping validates balances and emits credit-only updates for Codex snapshots. Tests cover mapping, omission, and clearing.
Usage state updates and probe identity packages/provider-core/src/server/usageLimits.ts, packages/provider-core/src/server/usageLimits.test.ts, packages/provider-core/src/server/managedProvider.ts, packages/provider-core/src/server/managedProvider.test.ts	Usage updates add, preserve, or clear credits. Full probes replace prior credits. Failed probes retain prior credits when authentication status, type, and normalized email match.
Account aggregation and balance labels packages/shared/src/usageLimits.ts, packages/shared/src/usageLimits.test.ts	Account aggregation tracks credits separately from quota windows and applies explicit clears. Balance labels cover unlimited, numeric, unavailable, and exhausted states.
Web and mobile credit cards apps/web/src/components/usage/UsageLimitsPooled.tsx, apps/web/src/components/usage/UsagePage.refresh.test.tsx, apps/mobile/src/features/usage/UsageLimitsPooled.tsx	Codex account cards display formatted balances and identify accounts when multiple accounts are present. The web refresh test checks balance updates and removal.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant Codex as Codex rate-limit response
  participant Mapper as codexRateLimitsToLimits
  participant State as applyUsageLimitsUpdate
  participant Accounts as collectLimitAccounts
  participant View as UsageLimitsPooled
  Codex->>Mapper: quota windows and credit data
  Mapper->>State: mapped usage limits and credit updates
  State->>Accounts: updated account usage limits
  Accounts->>View: merged limits and credit balance
  View->>View: format and render credit balance

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Merge Risk: ⚪ Minimal · up to 7bce6

No actionable issue remains established in this review. The credit-balance display is mergeable after normal checks and feature approval.

Security Architecture Review

Security architecture risk: 🔵 Low · up to e0f3e

The balances remain informational and do not grant spending or execution authority. Account-switch safeguards limit ordinary cross-account carryover. A shared aggregation edge case can hide previously reported quota windows, and refresh ordering can restore stale balance displays. Prior-session update cleanup was not fully established.

Retained concerns

• Low · architecture · inferred: A newer credit-only snapshot for a matching account can replace quota windows reported by another environment. The PR admits snapshots with credits and empty windows into aggregation, but quota selection still copies the freshest snapshot wholesale; only credits receive independent reconciliation afterward. This couples balance reporting to quota-state ownership and can remove allowance information from both pooled views. The explicit-null clear path avoids this replacement, so its regression coverage does not address the credit-object case. The demonstrated scope is presentation, not quota enforcement.

Security review details

Security Blast Radius

• inferred — The added exposure is account-associated balance metadata published through existing provider usage state and displayed across connected environments. The inspected changes introduce no spending command, credential transfer, or additional execution authority. Cross-account exposure through stale session callbacks remains unproven.

Trust Boundaries and Controls

• observed — Provider-reported balances are trimmed and included only when they are finite nonnegative decimal strings. Non-Codex limit buckets are rejected for live updates. Both views render a formatted label rather than interpreting the supplied balance as markup or an action.
• observed — Authentication access creates tracked child scopes and rejects new access while credentials are changing. Credential adoption closes owned sessions before updating credentials, and sign-in closes sessions before authentication. These are strong countercontrols to stale-session writes. The exact registry wrapper and notification-client cleanup chain were not fully verified, so callback isolation across every account transition remains a coverage gap rather than an established vulnerability.

Resilience and Maintainability Implications

• observed — Sparse live updates preserve omitted balances and quota windows, explicit null clears balances, and equivalent updates reuse the existing snapshot. Failed probes preserve last-good usage only after the managed refresh applies its account-identity checks.

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Pre-merge checks | 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check		The title clearly and concisely describes the primary change: displaying ChatGPT credit balances for Codex usage.
Description check		The description includes all required sections, explains the problem and implementation, documents scope, reports focused verification, includes UI evidence, and states the native runtime limitation. …
Linked Issues check		The changes meet the coding requirements in #17704. Codex mapping carries reported credit flags and valid balances through probe and update paths. Usage merging preserves omitted credits and applies e…
Out of Scope Changes check		The changes remain within #17704. Contract updates, Codex mapping, probe and live-update handling, account-switch handling, account aggregation, UI rendering, and regression tests support displaying t…

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create a new PR

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[rohan-patnaik]

Merged current main in e0f3e51a, preserving its workspace account grouping. Credit balances stay separate for the same email in different workspaces, clear when account identity is lost, and still honor explicit clears. All 100 focused tests, web/server typechecks and scoped lint/formatting pass. Hosted checks and feature approval remain pending.

Maintenance by GPT-6.1-Sol via Codex.

[coderabbitai]

Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @packages/shared/src/usageLimits.ts:
- Line 219: Update the snapshot merge logic around limitsNotice so quota-window
selection is independent of credit selection: retain the newest non-empty
windows for matching accounts when a newer credit-only snapshot has an empty
windows array. Add a regression test covering an older window-bearing snapshot
followed by a newer credit-only snapshot.

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📥 Commits

Reviewing files that changed from the base of the PR and between 92a3f2b and e0f3e51.

📒 Files selected for processing (4)

• packages/provider-core/src/server/managedProvider.test.ts
• packages/provider-core/src/server/managedProvider.ts
• packages/shared/src/usageLimits.test.ts
• packages/shared/src/usageLimits.ts

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