init claude-code

services/compact/timeBasedMCConfig.ts

@@ -0,0 +1,43 @@
+import { getFeatureValue_CACHED_MAY_BE_STALE } from '../analytics/growthbook.js'
+
+/**
+ * GrowthBook config for time-based microcompact.
+ *
+ * Triggers content-clearing microcompact when the gap since the last main-loop
+ * assistant message exceeds a threshold — the server-side prompt cache has
+ * almost certainly expired, so the full prefix will be rewritten anyway.
+ * Clearing old tool results before the request shrinks what gets rewritten.
+ *
+ * Runs BEFORE the API call (in microcompactMessages, upstream of callModel)
+ * so the shrunk prompt is what actually gets sent. Running after the first
+ * miss would only help subsequent turns.
+ *
+ * Main thread only — subagents have short lifetimes where gap-based eviction
+ * doesn't apply.
+ */
+export type TimeBasedMCConfig = {
+  /** Master switch. When false, time-based microcompact is a no-op. */
+  enabled: boolean
+  /** Trigger when (now − last assistant timestamp) exceeds this many minutes.
+   *  60 is the safe choice: the server's 1h cache TTL is guaranteed expired
+   *  for all users, so we never force a miss that wouldn't have happened. */
+  gapThresholdMinutes: number
+  /** Keep this many most-recent compactable tool results.
+   *  When set, takes priority over any default; older results are cleared. */
+  keepRecent: number
+}
+
+const TIME_BASED_MC_CONFIG_DEFAULTS: TimeBasedMCConfig = {
+  enabled: false,
+  gapThresholdMinutes: 60,
+  keepRecent: 5,
+}
+
+export function getTimeBasedMCConfig(): TimeBasedMCConfig {
+  // Hoist the GB read so exposure fires on every eval path, not just when
+  // the caller's other conditions (querySource, messages.length) pass.
+  return getFeatureValue_CACHED_MAY_BE_STALE<TimeBasedMCConfig>(
+    'tengu_slate_heron',
+    TIME_BASED_MC_CONFIG_DEFAULTS,
+  )
+}