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Grok never sends ACP usage_update. Occupancy is _meta.totalTokens on session/update; the window comes from models_cache.json. Do not treat turn_completed.usage.totalTokens as occupancy — that is billed usage.
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Problem
On Grok Build sessions the usage meter under the composer always showed 0, even after a turn had clearly filled the context window. Plan-limit rows (SuperGrok weekly, etc.) were fine; only the context-window row was empty.
Grok never sends ACP
usage_update. Live occupancy is_meta.totalTokenson everysession/update(latest-wins snapshot of how full the window is right now). The window size isinfo.context_windowin~/.grok/models_cache.json.turn_completed.usage.totalTokensis the turn's billed sum across model calls, not occupancy — using it would over-report.Verified against a live
updates.jsonl/signals.jsonpair:_meta.totalTokensmatchedcontextTokensUsed(e.g. 24095), whileturn_completed.usage.totalTokenswas the billing total (93005).Solution
_meta.totalTokenstoUsageUpdatedoccupancy, deduped so identical snapshots do not wake extra frames.models_cache.json, and from_x.ai/session/updateauto_compact_startedwhen a compact starts.turn_completed.usage.totalTokensso billed totals cannot clobber the meter.Checks
cargo test -p waku-core --lib driver::acp::tests::(21 passed, 3 ignored)cargo test -p waku-core --lib grok_(18 passed, includingreads_context_window_from_groks_model_cacheand the new occupancy tests)Waku Debug.appwith a Grok Build session after a settled turnDid not run the full CONTRIBUTING baseline (
protocol:check,@waku/clienttests). This change is the Grok ACP driver plusdocs/providers.md.