diff --git a/container/agent-runner/src/providers/claude.ts b/container/agent-runner/src/providers/claude.ts
index fbb077c..c9478b8 100644
--- a/container/agent-runner/src/providers/claude.ts
+++ b/container/agent-runner/src/providers/claude.ts
@@ -226,8 +226,12 @@ function createPreCompactHook(assistantName?: string): HookCallback {
 /**
  * Claude Code auto-compacts context at this window (tokens). Kept here so
  * the generic bootstrap doesn't need to know about Claude-specific env vars.
+ *
+ * Operator override: set CLAUDE_CODE_AUTO_COMPACT_WINDOW in the host env to
+ * raise or lower the threshold without editing source — useful when running
+ * with a 1M-context model variant or when emergency-tuning a deployment.
  */
-const CLAUDE_CODE_AUTO_COMPACT_WINDOW = '165000';
+const CLAUDE_CODE_AUTO_COMPACT_WINDOW = process.env.CLAUDE_CODE_AUTO_COMPACT_WINDOW || '165000';
 
 /**
  * Stale-session detection. Matches Claude Code's error text when a