feat(web): show provider usage limits in the composer

[eduardosilveiradev]

What Changed

Adds an always-visible usage-limit meter to the prompt composer. A small level glyph now sits in the footer between the attach button and the send button. Its fill is the quota left in the tightest window of the selected provider instance, drawn the way Usage → Limits draws its bars, and it turns the error colour once 10% or less is left. Hovering it opens a popover with every window: label, percent left, bar with the even-spending mark, pace glyph, and reset countdown.

There was already a limits viewer, but it lives on a separate page (Usage → Limits) and behind the /usage-limits command banner. This PR does not add a second data path: the meter reads the same ServerProvider.usageLimits snapshot those surfaces use, which the config stream keeps live as turn-driven account.rate-limits.updated events merge in. Nothing new crosses the wire.

• chat/UsageLimitMeter.logic.ts picks the selected instance's limits (via providersWithLimits + limitsNotice, so API-key accounts and failed probes hide the meter), selects the headline window, and formats the accessible label.
• chat/UsageLimitMeter.tsx is the glyph plus popover. The popover body reuses LimitWindows from the Limits page. The clock comes from the shared useNowMinute store, not Date.now() in render.
• ChatComposer.tsx computes the model from providerStatuses and selectedInstanceId and renders the meter beside the context-window ring. The resting-composer padding accounts for the extra control.
• usage/UsageLimits.tsx: the compact grid's label column grows from 9rem to 10rem so "Weekly · Fable" no longer truncates next to its percent.

Focused tests cover the resolver, headline selection, label formatting, and the trigger/popover rendering.

Why

You can't see how close a session or weekly limit is without leaving the thread. The context-window ring already gives that at-a-glance signal for context; this gives the same for subscription quota, using data the app already holds.

UI Changes

Before, the footer has attach and send only:

After, the level glyph sits between them. Here Claude's five-hour session has half its quota left:

Hovering lists every window with pace and reset countdown:

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

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Written by Claude Fable 5.1 working with @eduardosilveiradev in T3 Code.

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Closes discussions

• Improve discoverability of Usage Limits in the UI #11259

Summary by CodeRabbit

• New Features

  • Added a usage-limit meter to the chat composer, showing remaining quota, provider and plan details, and reset timing.
  • Usage limits now follow the selected provider instance and highlight low or nearly exhausted quotas.
  • Added reset-credit summaries and clearer messages when all usage windows have reset.
  • Improved accessibility labels and popover details for usage-limit status.

• Bug Fixes

  • Expired usage windows are now excluded from usage summaries and detailed views.
  • Adjusted composer spacing and limit-window sizing for clearer display.

[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This adds a substantial cross-layer capability: provider rate-limit events become retained activities and a new composer meter/popover displays quota, credit, spend, and overage state. The new production logic and automatic user-facing behavior extend well beyond a small self-contained UI change.

^{You can add or adjust custom eligibility rules. Learn more.}

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📒 Files selected for processing (2)

• apps/web/src/components/chat/UsageLimitMeter.test.tsx
• apps/web/src/components/chat/UsageLimitMeter.tsx

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

• apps/web/src/components/chat/UsageLimitMeter.tsx
• apps/web/src/components/chat/UsageLimitMeter.test.tsx

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📝 Walkthrough

Walkthrough

The composer resolves usage limits for the selected provider instance and displays them in a meter. The meter shows remaining quota, reset information, provider and plan details, active windows, reset credits, and reset-window states. Tests cover resolution, selection, labels, and rendering.

Changes

Usage limits

Layer / File(s)	Summary
Usage-limit resolution and selection apps/web/src/components/chat/UsageLimitMeter.logic.ts, apps/web/src/components/chat/UsageLimitMeter.logic.test.ts	Adds usage-limit models and helpers. The logic validates provider limits, detects reset windows, selects the lowest remaining active window, and formats accessible labels.
Usage-limit meter rendering apps/web/src/components/chat/UsageLimitMeter.tsx, apps/web/src/components/chat/UsageLimitMeter.test.tsx, apps/web/src/components/usage/UsageLimits.tsx	Filters expired windows, renders reset credits, shows an all-windows-reset message, and updates the compact window layout. Tests cover quota states, reset windows, reset credits, and glyph colors.
Chat composer integration apps/web/src/components/chat/ChatComposer.tsx	Resolves limits for the selected provider, renders the meter beside the context-window meter, and adjusts resting-state padding for the displayed meters.

Priority: ➖ Normal

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

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant ProviderStatuses
  participant ChatComposer
  participant UsageLimitMeterLogic
  participant UsageLimitMeter
  participant LimitWindows
  ProviderStatuses->>ChatComposer: provider statuses and selected instance
  ChatComposer->>UsageLimitMeterLogic: resolveUsageLimitMeter
  UsageLimitMeterLogic-->>ChatComposer: active usage-limit model
  ChatComposer->>UsageLimitMeter: render model
  UsageLimitMeter->>LimitWindows: render active usage windows

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Merge Risk: ⚪ Minimal · up to 854bc

The reviewed changes have no established merge-blocking risk.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 40.43% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 47 functions across 17 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the primary change: showing provider usage limits in the web composer.
Description check	✅ Passed	The description is detailed and covers the change, rationale, UI impact, screenshots, testing scope, and checklist. The interaction video checkbox is not completed, but the description remains mostly …

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Actionable comments posted: 3

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Inline comments:
In `@apps/web/src/components/chat/UsageLimitMeter.tsx`:
- Line 91: Update the LimitWindows invocation in UsageLimitMeter so its windows
prop excludes entries whose resetsAt has passed, matching
selectHeadlineUsageWindow’s reset filtering; preserve valid windows and add a
test covering expired-window exclusion from the popover.
- Line 22: Update UsageLimitMeter to derive its current time from a shared clock
subscription or local timer state rather than calling Date.now() only during
render. Preserve the props.now override while ensuring the warning glyph,
accessible label, and popover countdown re-render after resetsAt passes when
ChatComposer omits now.
- Line 25: Update UsageLimitMeter to pass or render the available
model.limits.resetCredits data in the usage-limit popover alongside
LimitWindows, using a compact reset-credit summary. Add a test covering an
account with available reset credits and verify the summary is displayed.

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📒 Files selected for processing (5)

• apps/web/src/components/chat/ChatComposer.tsx
• apps/web/src/components/chat/UsageLimitMeter.logic.test.ts
• apps/web/src/components/chat/UsageLimitMeter.logic.ts
• apps/web/src/components/chat/UsageLimitMeter.test.tsx
• apps/web/src/components/chat/UsageLimitMeter.tsx

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[oposoyo]

Applied this branch on top of current main (20363c3) and ran it against my own Claude subscription. It squash-merged with no conflicts, over the 77 upstream commits since this branch's merge-base. UsageLimitMeter's 11 tests pass and vp run --filter @t3tools/web typecheck comes back with 0 errors.

The meter showed my real windows on first render: Session 69% left · Weekly 87% left · Weekly · Fable 96% left.

On "why not use what already exists": both surfaces that show this today are pull, not push. /usage-limits renders a dismissible banner built from a frozen snapshot that dies when you switch threads, and Usage → Limits is a separate page. Neither tells you you're at 8% until you go looking — which is precisely when you don't. The context-window ring already solved this shape of problem for context; this is the same move for quota, and it reads the same ServerProvider.usageLimits snapshot rather than opening a second data path.

Worth noting for the maintenance question: four of the six files are new, so the recurring conflict surface is ~29 lines in ChatComposer.tsx plus one line in usage/UsageLimits.tsx.

Happy to keep rebasing and testing this branch against main if that's useful.

[t3-code]

thanks for working on checking limits without leaving a thread. we are closing this proposal because we avoid hover-triggered panels and do not want another permanent composer control. limits are already available through Usage → Limits and /usage-limits.

• openOnHover opens a detailed panel after 150ms beside frequently used composer controls. that invites accidental activation and does not fit the intended interaction.
• when all reported reset times pass, the meter shows 100% remaining without a fresh reading. activity elsewhere may already have consumed quota in the next window. expired readings must remain unknown or stale, not appear as confirmed full quota; a caveat inside the popup does not correct the meter outside it.
• the component tests replace the popover with static markup and assert labels, colors, and mocked content. they do not verify hover behavior, dismissal, keyboard interaction, or placement.

please reconsider the interaction and whether any additional composer visibility is needed before doing further implementation work. a different proposal should preserve uncertainty in stale readings and test the actual interactions.

closed at the request of @StiensWout.