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fix(claude): context meter shows where Claude actually auto-compacts #22654

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Merged
maria-rcks merged 2 commits into from
Oct 31, 2026
Merged

fix(claude): context meter shows where Claude actually auto-compacts #22654

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2d55610
fix(claude): context meter shows where Claude actually auto-compacts
GitJarno Oct 21, 2026
4525d2e
Merge remote-tracking branch 'github/main' into takeover-22654
maria-rcks Oct 30, 2026
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6 changes: 3 additions & 3 deletions apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -6077,7 +6077,7 @@ describe("ClaudeAdapterV2 background wake turns", () => {
? [event.providerTurn.tokenUsage.autoCompactThreshold]
: [],
),
[150_000, 150_000, 150_000, 150_000],
[117_000, 117_000, 117_000, 117_000],
);
}).pipe(
Effect.provide(
Expand All @@ -6088,10 +6088,10 @@ describe("ClaudeAdapterV2 background wake turns", () => {

it.effect.each([
{ autoCompactWindow: "", model: "claude-sonnet-4-6", threshold: undefined },
{ autoCompactWindow: "150000", model: "claude-sonnet-4-6", threshold: 150_000 },
{ autoCompactWindow: "150000", model: "claude-sonnet-4-6", threshold: 117_000 },
{ autoCompactWindow: "200000", model: "claude-sonnet-4-6", threshold: undefined },
{ autoCompactWindow: "650000", model: "claude-sonnet-4-6", threshold: undefined },
{ autoCompactWindow: "650000", model: "uncatalogued-model", threshold: 650_000 },
{ autoCompactWindow: "650000", model: "uncatalogued-model", threshold: 617_000 },
])(
"ignores stale snapshots after compaction and reports threshold $autoCompactWindow for $model",
({ autoCompactWindow, model, threshold }) =>
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10 changes: 7 additions & 3 deletions apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.ts
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Expand Up @@ -231,10 +231,14 @@ function claudePromptCacheTtlMs(
}

// Claude caps the window at the model's context, so a setting at or above it never applies.
// Below that, Claude compacts 33,000 tokens short of the window: Claude Code 2.1.305's
// getContextUsage reports a 150,000 window as a 117,000 threshold, for every catalog model.
const CLAUDE_AUTO_COMPACT_RESERVE_TOKENS = 33_000;

function claudeAutoCompactThreshold(autoCompactWindow: string, maxTokens: number | null) {
const threshold = Number(autoCompactWindow);
return threshold > 0 && (maxTokens === null || threshold < maxTokens)
? { autoCompactThreshold: threshold }
const windowTokens = Number(autoCompactWindow);
return windowTokens > 0 && (maxTokens === null || windowTokens < maxTokens)
? { autoCompactThreshold: windowTokens - CLAUDE_AUTO_COMPACT_RESERVE_TOKENS }
: {};
}

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