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3 commits

Author SHA1 Message Date
Danny Avila
7cf2877b45
🪙 feat: Context Gauge UX, Hover Snapshot, Click Breakdown, Currency, Cost-On-By-Default (#13739)
* 🪙 feat: Default Context Cost On + Configurable Display Currency

Flip interface.contextCost to default-on (schema default true, resolved per-field
in loadDefaultInterface so it applies unless an admin explicitly sets false).

Add interface.currency { code, rate }: an ISO-4217 code and a static USD→local
multiplier so non-USD communities (EUR, JPY, CNY, BRL, ZAR, …) can show costs in
their currency. Inner fields are required (no nested defaults) to keep zod
input/output identical; loadDefaultInterface passes it through. Display-only —
model prices stay USD server-side.

* 🪙 feat: Currency-Aware Context Cost Formatting

formatCost(usd, currency?) applies the static rate (usd × rate) and formats via
a cached Intl.NumberFormat keyed by currency code — locale-correct symbol and
per-currency decimals, falling back to USD on a malformed code. The USD default
(code USD, rate 1) is byte-identical to the prior output.

* 💄 feat: Gauge Hover Snapshot, Click-to-Open Breakdown, Hide Until Data

Replace the hover-only HoverCard with: a compact hover snapshot tooltip
("Context 341.7k / 1.0M (34%)" + cost when enabled) via the existing Tooltip
primitive, and a click-opened Ariakit popover for the full breakdown that
dismisses on outside-click/Escape/blur. Gate visibility on usedTokens > 0 so a
fresh, message-less chat shows nothing, with an animate-in fade as the first
tokens land. Thread the display currency into the breakdown + snapshot.

* 🧪 test: Gauge Interaction + Visibility E2E

Switch the breakdown specs from hover to click, and add a test that the gauge is
absent on a new chat, surfaces the snapshot tooltip on hover, opens the breakdown
on click, and dismisses on Escape and outside-click.

* 🪙 fix: Harden Currency Resolution + Layer Breakdown Above Tooltip

Address Codex review on the currency display:
- Unsupported currency code now falls back to USD AND rate 1, so a typo like
  { code: 'EURO', rate: 0.92 } no longer shows a converted amount under a $
  symbol (was $9.20 for a $10 cost; now $10.00).
- A non-finite/negative rate (e.g. a partial admin override that set code before
  rate) falls back to rate 1, so a cost never renders as NaN.
- Fraction digits derive from the currency's own defaults, so zero-decimal
  currencies (JPY) render ¥5, not ¥5.00, and extra sub-unit precision applies
  only to currencies that have minor units. USD output is unchanged.
- Raise the click breakdown popover to z-[200] so it always sits above the
  z-150 hover tooltip when both briefly coexist.

* 🪙 fix: Validate ISO-4217 Codes + Derive Tiny Threshold from Minor Unit

Address Codex review on currency formatting:
- Intl.NumberFormat accepts any well-formed 3-letter code (EUU, RMB) without
  throwing, so the previous construct-based check missed typos/non-ISO codes and
  applied the rate under a bogus label. Validate against Intl.supportedValuesOf
  ('currency') (the ISO-4217 set); unsupported codes fall back to USD + rate 1.
  Codes are normalized to upper-case; graceful fallback if the runtime lacks
  supportedValuesOf.
- The tiny-amount threshold now derives from the currency's minor unit
  (10^-fractionDigits): 0.01 for 2-decimal, 0.001 for 3-decimal (KWD/BHD/JOD),
  1 for zero-decimal — instead of a hard-coded 0.01. Sub-unit precision trims to
  each currency's own scale. USD output unchanged.
2026-06-14 13:38:27 -04:00
Danny Avila
b03b2a0a29
💾 feat: Persist Context Breakdown & Branch/Total Usage Cost (#13734)
* 💾 feat: Persist Context Breakdown & Branch/Total Usage Cost

Persist the granular context breakdown and per-response usage/cost on the
response message metadata, and re-derive branch + total usage/cost from a
per-message index so the popover survives reloads and is branch-aware live.

- Add aggregateEmittedUsage + buildPersistedContextUsage helpers in
  packages/api; capture the latest visible snapshot and every emitted
  on_token_usage payload via contextUsageSink/usageEmitSink.
- Attach metadata.contextUsage (Part A) and metadata.usage (Part B) on the
  agents response message in sendCompletion.
- Carry per-message usage on the token index; add sumTotalUsage/setEntryUsage
  and branch-scoped usage on sumBranch.
- Repurpose the session accumulator into a single in-flight pending holder;
  flush it into the index at finalize; hydrate breakdowns on load.
- Render branch cost with a conditional all-branches total in the breakdown.

* 🧹 chore: Remove orphaned com_ui_session_cost i18n key

* 🩹 fix: Address Codex review — normalize usage server-side, fix reload deltas

- Persist per-event-normalized display units in metadata.usage (TResponseUsage)
  so reloaded mixed-provider turns match the live session; client reads them
  directly instead of re-normalizing with a single stamped provider (P2).
- Persist completedOutputTokens (final call output) on metadata.contextUsage so
  a reloaded multi-call turn adds the post-snapshot delta, not the full
  tokenCount the snapshot already counts (P2).
- buildIndex preserves a prior entry's immutable usage when a rebuilt cache
  message lacks metadata.usage, so a mid-session rebuild (regenerate) keeps a
  sibling branch's flushed cost (fixes the e2e regenerate failure).
- Track costKnown so turns saved with contextCost off don't render $0.00 when
  cost display is later enabled (P3).
- Use an epsilon for the all-branches cost comparison to avoid a spurious total
  row from float summation order (P3).
- Update unit/integration/e2e tests for the new shapes; regenerate e2e asserts
  the all-branches total after reload (deterministic via persisted metadata).

* 🩹 fix: Address Codex round 2 — pending leak, cost coverage, reload delta

- Clear the in-flight pending usage on terminal abort/error (resetLive), so a
  stopped generation's tokens no longer merge into the next response (P2).
- costKnown now means COMPLETE coverage (ANDed): a branch mixing cost-bearing
  and cost-less turns is flagged incomplete and the cost row is hidden rather
  than rendering an under-reported total (P2).
- Drop the tokenCount fallback for completedOutputTokens on reload: only the
  persisted post-snapshot delta is used, so a multi-call turn whose provider
  emitted no usage_metadata no longer double-counts earlier output (P2).
- Update tokens.spec for AND coverage semantics + incomplete-cost case.

* 🩹 fix: Address Codex round 3 — no-usage snapshots, total coverage, provider-less cache

- Skip persisting metadata.contextUsage when the response emitted no primary
  usage event: without a known post-snapshot output the granular gauge would
  undercount the reply on reload, so fall back to the coarse per-message
  estimate instead (P2).
- Gate the all-branches cost row on totalUsage.costKnown so an incomplete total
  (a sibling saved without cost) never renders an under-reported figure (P2).
- aggregateEmittedUsage/finalCallOutputTokens now normalize per-event with the
  client's magnitude fallback (normalizeEventUnits) instead of billing
  splitUsage, so provider-less cached events match live on reload (P2).
- Add backend test for the provider-less cached case.

* 🩹 fix: Address Codex round 4 — abort attribution, complete cost coverage

- aggregateEmittedUsage persists cost only when EVERY call was priced; a partial
  pricing failure now omits cost so the client treats coverage as unknown rather
  than reading an under-reported sum as authoritative (P2).
- finalizeUsage flushes pending into the response entry only when events were
  folded this session (eventCount > 0), so a late/second resumable subscriber
  carrying persisted metadata.usage keeps it instead of being overwritten with
  an empty pending record (P2).
- On user stop, attribute the in-flight pending usage to the partial response
  (new attributePending handler) instead of discarding it in resetLive — the
  stopped reply's billed tokens are kept and still can't leak into the next
  response; resetLive's discard remains for the error path (P2).

* 🐛 fix: Persist branch cost across branch switches via sticky usage history

Branch cost vanished on switching to a sibling branch (until a new turn) — the
cost analog of the granularity bug. buildIndex rebuilds the token index from the
messages cache; a sibling generated this session whose cache message lacks
metadata.usage (and is transiently dropped from the cache during regenerate)
lost its live-flushed usage, so sumBranch found none and the cost row hid.

Fix: a sticky per-response usage map (conversationId → messageId → usage),
written by setEntryUsage and never rebuilt from the cache — the usage counterpart
of snapshotsByAnchorFamily for the breakdown. buildIndex/upsertEntries restore an
entry's usage from it when the message carries none; cleared on convo switch and
migrated with the index. Add unit coverage for the drop-then-readd regression and
an e2e assertion that branch cost survives a branch switch.

* 🐛 fix: Re-index on branch switch so branch cost survives the switch

The sticky usage history alone didn't fix the reported branch-switch cost drop:
on a branch switch no cache `updated` event fires, so the index subscriber never
re-ran, and the post-regenerate rebuild was skipped while `isSubmitting` was
still true — leaving the index stale and missing the now-viewed branch's
response entirely (sticky can only restore entries present in a rebuild).

Re-index from the messages cache on every tail change (created/finalize AND
branch switch), not just while submitting. The cache holds the full message set
at switch time, so the viewed branch's response is re-added and its usage
restored from metadata.usage or the sticky history → sumBranch finds it and the
branch cost renders. Verified locally: the branch-switch e2e now passes (the
cost section shows both the branch row and the all-branches total). Also fixed
that e2e assertion to target a single cost value (strict-mode safe).

* 🩹 fix: Handle stopped-stream usage — reset pending + persist abort metadata

Codex round (stop/abort edges):
- Resumable explicit-stop (intentional SSE close) reset UI state but never
  cleared pendingUsageFamily, so usage folded before the stop leaked into the
  next response in the conversation. Discard pending on intentional close
  (resetLive); a resume re-folds via backfillUsage, so nothing is lost.
- The abort save path (abortMiddleware) persisted the stopped response without
  metadata.usage/contextUsage, so its cost + breakdown vanished on reload.
  Rebuild both from the job's persisted tokenUsage (emitted payloads incl. cost)
  and contextUsage snapshot — parity with the normal sendCompletion path;
  breakdown gated on a primary usage event like buildResponseMetadata.

Deferred (per scope decision): mid-stream branch-switch transiently shows the
streaming branch's pending on the viewed sibling (cosmetic, until finalize).

* 🩹 fix: Persist abort metadata on the real agents route + tighten snapshot gate

Codex round (corrects last round's wrong-path fixes):
- Stopped AGENTS responses are saved by routes/agents/index.js (/chat/abort),
  not abortMiddleware — so last round's metadata fix never ran for them. Moved
  the rollup/snapshot builder into packages/api as buildAbortedResponseMetadata
  (shared, unit-tested) and applied it in BOTH abort save paths, so a stopped
  agent reply keeps its cost + breakdown on reload.
- Persist the breakdown only when the FINAL visible call emitted usage: track a
  per-response snapshot count and require primaryUsageCount >= snapshotCount.
  Previously any earlier primary usage event passed the gate, so a multi-call
  turn whose final call emitted no usage_metadata used an earlier call's output
  as completedOutputTokens (already counted by the latest snapshot) → reload
  over-reported. Now it falls back to the coarse estimate.

Resumable stop pending-reset (prior round, 3cde6fe035) already flows through
clearAllSubmissions → SSE close → the intentional-close handler's resetLive.
Deferred per scope: mid-stream branch-switch pending attribution (tracked).

* 🩹 fix: Abort breakdown over-count + resume re-fold after pending discard

Codex round (on the re-applied abort/snapshot work):
- buildAbortedResponseMetadata now persists ONLY the usage/cost rollup, not the
  context breakdown. The abort path can't tell whether the final call emitted
  usage (the job stores only the latest snapshot, not a count), so persisting
  the breakdown risked reusing an earlier call's output as completedOutputTokens
  (already in the snapshot) → reload over-count. Stopped/incomplete responses
  now fall back to the coarse gauge estimate, which is safe and apt.
- resetLive now also forgets the conversation's folded usage-event identities
  (clearUsageFolded). Discarding pending on a terminal/intentional close left
  the folded keys set, so a later resume's backfillUsage saw the persisted
  events as duplicates and never rebuilt pending — leaving the response's usage
  missing until a full reload. Clearing them lets the resume re-fold.
2026-06-14 10:48:07 -04:00
Danny Avila
db7011d567
📊 feat: Real-Time Context Window & Token Usage Tracking (#13670)
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* 📊 feat: Real-Time Context Window & Token Usage Tracking

* 🧪 fix: Align Pricing Spec Dep Signatures with TxDeps

* 🩹 fix: Resolve Codex Findings for Context Usage Tracking

* 📊 feat: Granular Tool Token Breakdown with Deferred Splits

* 🧪 test: Cover Session Cost in Mock E2E and Scope Usage Selectors

* 🧪 test: Live Host-Pipeline Usage Verification (Env-Gated)

* 🧪 test: Local Real-Provider Multi-Turn E2E Harness

* 🪙 fix: Keep Tagged Usage Buckets Out of the Live Context Estimate

* 🩹 fix: Scoped Token-Config Fallback and Sequential Visibility for Usage Events

* 🩹 fix: Address Usage Review Findings — Cost Timing, Scoped Caches, Finalized Output

- carry the post-snapshot output estimate into the context snapshot at
  finalize so the gauge keeps the last response after live resets
- accumulate per-rate billable units and price the session cost at
  render, so usage events arriving before the token-config load still
  count once it resolves
- pass user-scoped token-config cache keys through loadConfigModels
  fetches and drop the controller's unscoped fallback to prevent serving
  another user's resolved config
- tag emitted usage events with a per-run seq so resume dedupe never
  drops a distinct call with an identical payload
- admit the static tokenConfig override in the custom endpoint schema so
  it survives zod parsing into req.config

* 🩹 fix: Align Client Usage Accounting with Backend Cost Semantics

- classify cache tokens by provider (shared inputTokensIncludesCache from
  data-provider, consumed by both the backend billing path and the client)
  instead of a magnitude heuristic, so Anthropic/Bedrock turns where cache
  is smaller than uncached input no longer under-bill input
- mirror resolveCompletionTokens on the client so Vertex-style hidden
  thinking tokens are reflected in the Output row and session cost
- prefer endpoint pricing over adapter-provider pricing so a custom
  endpoint can price a known model name without built-in rates shadowing it
- carry static cacheRead/cacheWrite overrides through the tokenConfig
  schema and buildTokenConfigMap

* 🩹 fix: Honor Static Token Config in Billing; Tighten Usage Freshness

- initializeCustom now uses a static endpoint tokenConfig as the agent's
  endpointTokenConfig (billing + balance checks), not just the advertised
  UI config — previously the gauge showed admin rates while the agent
  billed against built-in tables
- invalidate the token-config query alongside models on user-key add/
  revoke so context windows and pricing refresh without a reload
- include maxContextTokens in ChatForm's stabilized conversation memo so
  the gauge reflects a changed context-window setting immediately
- feed the live output estimate from the legacy content path (direct and
  assistants streams), setting from cumulative part text rather than
  accumulating deltas

* 🩹 fix: Resume Usage Dedup, Agent Pricing, and Partial Override Billing

- fold usage events idempotently by (runId, seq) so resume backfill no
  longer resets the conversation totals — a mid-stream reconnect keeps the
  usage of prompts already completed earlier in the session
- tap replayed pending message/reasoning/content events so output streamed
  past the resume snapshot reaches the live estimate, not just the message
- resolve cost against the agent's backing endpoint (Agents conversations
  report endpoint `agents` / provider `openAI`, neither of which keys a
  custom endpoint's tokenConfig)
- getMultiplier/getCacheMultiplier fall back to the standard tables for
  models absent from a partial endpointTokenConfig, so a partial static
  override no longer bills non-listed models at defaultRate while the UI
  shows the correct pattern rate

* 🩹 fix: Repaired Output in Gauge, Cache-Rate Keys, Config Gate, Usage Cleanup

- live/completed gauge counts the repaired completion (normalized output),
  so under-reporting providers don't drop the response from used context
- translate static tokenConfig cacheWrite/cacheRead onto the write/read
  keys getCacheMultiplier reads, so cache tokens bill at the configured
  rate instead of the prompt-rate fallback
- clear the token index and usage atoms when leaving a conversation, so
  visited histories don't accumulate in memory for the tab's lifetime
- wait for startupConfig before mounting the gauge, so a deployment with
  contextUsage disabled never briefly mounts it or fires the token-config
  query on first load

* 🩹 fix: Move Token-Config Resolution to TS; Key Live Usage by Created Convo

- extract the token-config resolution (override gathering + cache lookup +
  buildTokenConfigMap) into resolveTokenConfigMap in packages/api, leaving
  the /api controller a thin request-scoped wrapper (CLAUDE.md TS rule)
- getConvoKey prefers the user message's real conversationId once the
  `created` event stamps it, so a new chat's first-response live gauge and
  totals land under the id TokenUsage subscribes to instead of NEW_CONVO

* 🩹 fix: Clear Stale Redis Job Usage; Live-Tap Legacy Streams; Share Fetched Config

- DEL the Redis job hash before re-creating it so a reused streamId can't
  inherit a prior run's contextUsage/tokenUsage and backfill stale usage
- tap the legacy {message,text} stream branch (non-agent OpenAI/Anthropic
  streams) into the live estimate, not just the content path
- copy a deduped fetch's token config to every sibling endpoint sharing the
  baseURL/key/headers, so /token-config resolves each by its own name

*  revert: Don't DEL Redis job hash in createJob (breaks cross-replica resume)

createJob is an idempotent join — a second replica calls it for the same
streamId to share an in-flight stream's state. DELeting the hash wiped the
prior replica's persisted created/usage state, so a joining replica missed
the created event (GenerationJobManager cross-replica integration test).
Reverts the F1 change from 2bfce0c34b; the stale-usage concern doesn't
arise in practice (streamId is unique per generation).

* 🩹 fix: Best-Effort Usage Emit; Tag Hidden Sequential-Agent Usage

- wrap the ModelEndHandler usage emit in try/catch so a failed telemetry
  delivery (closed SSE / Redis publish error) can't abort the handler
  before thought-signature capture, which would break resumed tool calls
- tag hidden sequential-agent usage as 'sequential' (non-primary) so the
  client folds it into session cost/totals but not the live context gauge,
  instead of letting an undefined usage_type inflate the visible gauge

* 🩹 fix: Refetch Stale Token Config on Mount; Normalize Vertex for Lookup

- useTokenConfigQuery refetches on mount when stale, so a user-key change
  that invalidates tokenConfig while the gauge is unmounted takes effect on
  return instead of serving the prior key's resolved config
- normalize a Vertex-backed agent's provider (vertexai) to the google
  token-config key, so Gemini context windows and rates resolve instead of
  showing unknown context / $0 cost

*  feat: Server-Side Per-Event Cost (Authoritative Pricing for the Gauge)

Move usage-cost pricing to the single source of truth. The backend prices
each model call with the same billing functions (premium tiers via
getMultiplier(inputTokenCount), cache rates) and emits the USD cost on
on_token_usage when interface.contextCost is enabled; the client sums
emitted costs instead of re-deriving from base token-config rates.

- computeUsageCostUSD reuses prepareTokenSpend/prepareStructuredTokenSpend
  so the emitted cost matches what is billed (incl. premium thresholds)
- getDefaultHandlers gains a usageCost pricing context; initialize.js wires
  db.getMultiplier/getCacheMultiplier gated on contextCost (agents path)
- client UsageTotals carries a summed costUSD; retire the client-side rate
  lookups (costFromUnits/calcUsageCost) that drifted from backend pricing
  and produced the provider-keying / cache-key / Vertex / premium findings
- keep normalizeUsageUnits for the displayed token counts; token-config is
  still used for the context-window meter

Fixes the premium-tier session-cost under-report (gpt-5.x / gemini-3.1
above their input thresholds).

* 🩹 fix: Branch-Accurate Usage Snapshot + Clearer Gauge Track Contrast

- re-anchor the context snapshot from the user message to the response
  message at finalize. Regenerating a response branches off a shared user
  message, so anchoring on it made the snapshot read as "active" on both
  branches — switching to the sibling branch showed the wrong (other
  branch's) context. The response message is branch-unique, so sibling
  branches now correctly fall back to their own per-branch totals.
- raise the gauge ring's track/fill contrast (muted track, prominent fill)
  so the used portion reads clearly as a fill-level indicator

* 🩹 fix: Tag Sequential Usage in Billing; Emit Subagent Cost; Reset Live on Resume Errors

- tag hidden sequential-agent usage `usage_type: 'sequential'` on the
  COLLECTED usage (not just the emit), and treat it as non-primary in
  recordCollectedUsage (billed, excluded from the reported output total) so
  hidden intermediate output stops inflating the parent's tokenCount/pruning
- emit on_token_usage from the subagent usage sink (tagged `subagent`, with
  authoritative cost when contextCost is on) so the gauge's session
  cost/totals include billed subagent usage; it stays out of the live meter
- call resetLive on the resumable 404 and max-retry terminal branches so the
  gauge doesn't keep counting stale in-flight tokens after the stream ends

* 🎨 fix: Contrast the Popup Context Bar; Revert Ring Restyle

- raise the popup breakdown's context progressbar contrast (muted
  surface-tertiary track, prominent text-primary fill) — that's the bar the
  contrast feedback was about
- revert the gauge ring restyle (kept its original border-heavy track /
  text-secondary fill); the ring wasn't the element in question

* 🩹 fix: Stop Snapshot Granularity Leaking Across Branches; Revert Tree Memo

- a null-anchor context snapshot was treated as active on every branch,
  leaking one generation's granular breakdown onto sibling branches. Require
  a non-null (response-message) anchor on the viewed branch instead, so
  siblings without a matching snapshot fall back to their own totals.
- revert the buildTree WeakMap memo in messages.ts. buildTree is pure (builds
  from shallow copies) so the memo was behaviorally identical, but it was the
  feature's only change to core branch-navigation selectors — removing it
  matches upstream and rules it out of branch-navigation debugging.

* 🪙 fix: Thread Endpoint Token Config to Agent Billing, Cost, and Context Limits

Custom-endpoint agents resolve an endpointTokenConfig during agent init but
it never reached the AgentClient, so spending, emitted cost, and runtime
max-token resolution all fell back to default rates for those agents.

- Surface options.endpointTokenConfig on the returned InitializedAgent.
- Pass it to the AgentClient (this.options.endpointTokenConfig) so the
  spending path bills at configured rates.
- Thread it through usageCost to computeUsageCostUSD so emitted per-event
  cost matches billing.
- getModelMaxTokens/getModelMaxOutputTokens fall back to the built-in map
  for models absent from a partial override (matches buildTokenConfigMap);
  consolidates the duplicated fallback in pricing.ts.

* 🪙 fix: Preserve Granular Breakdown Across Branch Switches

The granular context breakdown lives only in the live on_context_usage
snapshot — a single per-conversation slot, anchored to the latest response
and overwritten by each generation. Switching to a branch generated earlier
this session lost its tool/skill/system rows and fell back to coarse totals.

Retain each generation's finalized snapshot in a per-conversation map keyed
by its branch-unique response id (snapshotsByAnchorFamily). When the live
snapshot is off the viewed branch, walk the branch tail for its deepest
stored anchor and render that breakdown. Bounded by generation count and
cleared on conversation switch; the live/just-generated path is unchanged.

* 🪙 fix: Harden Resume Seeding and Subagent Usage Emission

- useResumableSSE: skip the trailing-output live seed when the resume
  carries a context snapshot; the snapshot's messageTokens already counts
  produced output, so seeding it again inflated usage until the next reset.
- AgentClient subagent emitter: await GenerationJobManager.emitChunk like
  every other caller (it persists before publishing), so a floating promise
  can't race job cleanup and a Redis/publish failure is caught by the
  emitter's try/catch instead of surfacing as an unhandled rejection.

* 🧪 test: Playwright Coverage for Context Breakdown Granularity

Add a test-only data-testid distinguishing the granular snapshot breakdown
(context-breakdown) from the coarse message-history estimate
(context-estimate), then assert granularity in the mock e2e harness:

- renders the granular breakdown from the live on_context_usage snapshot
  (guards that the snapshot event actually reaches the popover, not just the
  usage totals).
- preserves the granular breakdown after switching branches — regenerate to
  overwrite the single live snapshot, switch back, and confirm the rows
  survive via the per-anchor snapshot history map.

Branch regenerate/sibling selectors mirror the existing chat.spec branch test.
All three usage specs pass against the mock pipeline.

* 🪙 fix: Correct Resume Live-Seed, Fallback Re-index, and Subagent Emit Flush

Codex round on the prior commit:

- countTrailingOutputChars now counts only output at the very END of the
  aggregated content (0 when the model paused at a tool call), and the resume
  path always seeds it. The earlier skip-trailing-tool-parts behavior plus the
  skip-seed-when-snapshot gate together over- or under-counted in-flight
  output on resume; one rule fixes both — pre-invoke snapshot budget is never
  double-counted, and genuine in-flight output is no longer dropped.
- useTokenUsage re-indexes from the messages cache on tail change while
  submitting. The cache subscriber is muted during streaming, so without a
  context snapshot (non-agent streams) sumBranch missed the created tail and
  dropped history + prompt until finalize. Bounded — tailId only shifts on
  created/finalize/branch-switch.
- AgentClient tracks subagent usage emit promises and flushes them in
  chatCompletion's finally. The sink fires the emitter without awaiting, and
  resume reads the usage emitChunk persists (HSET), so cleanup must not race
  it or resumed clients miss billed subagent usage.
2026-06-13 19:38:28 -04:00