diff --git a/scripts/lib/ci-node-test-plan.mts b/scripts/lib/ci-node-test-plan.mts
index 5839c6d7fc1d..8e914baa57cc 100644
--- a/scripts/lib/ci-node-test-plan.mts
+++ b/scripts/lib/ci-node-test-plan.mts
@@ -531,7 +531,13 @@ const COMPACT_GITHUB_GROUP_SECONDS_HINTS = new Map<string, number>([
 
 // Hybrid-specific Blacksmith observations from 31949756966, plus the
 // gateway-core-3 139.5s spike in 31938297538 that must stay singleton.
+// agents-core-models: 56.3s median (n=6, p90 58.6s) across 260 compact jobs on
+// 2026-08-16 against a 36s scaled estimate. It was the dominant term in the
+// only bin measuring >=1.25x its prediction (compact-large-19, 122s vs 88s).
+// Sum a shard's per-config Duration lines before taking a median; pooling them
+// reads as a large over-prediction that is not there.
 const COMPACT_HYBRID_GROUP_SECONDS_HINTS = new Map<string, number>([
+  ["agentic-agents-core-models", 56],
   ["agentic-commands-doctor", 64],
   ["agentic-gateway-core-3", 140],
   ["core-runtime-cron-service", 80],
diff --git a/test/scripts/ci-node-test-plan.test.ts b/test/scripts/ci-node-test-plan.test.ts
index 743a20602716..6697e140497d 100644
--- a/test/scripts/ci-node-test-plan.test.ts
+++ b/test/scripts/ci-node-test-plan.test.ts
@@ -382,12 +382,28 @@ describe("scripts/lib/ci-node-test-plan.mts", () => {
       "agentic-gateway-core-3",
     ]);
     expect(hybridLargeTail?.predictedSeconds).toBe(140);
-    const hybridJobOf = (name: string) =>
-      hybridCompact.findIndex((shard) => shard.groups.some((group) => group.shard_name === name));
-    // Synthesized hosted stripes retain divided admission weights, while
-    // native hybrid groups use Blacksmith stripe hints during rebalance.
-    expect(hybridJobOf("agentic-agents-core-runtime-hosted-1")).not.toBe(
-      hybridJobOf("agentic-agents-core-tools"),
+    // Synthesized hosted stripes carry divided admission weights while native
+    // hybrid groups carry Blacksmith stripe hints, so both weight sources must
+    // survive rebalancing rather than one class monopolizing the tall bins.
+    // Assert that property, not one arrangement: bin membership legitimately
+    // moves whenever a hint is refit from fresh measurements.
+    const hybridStripeBins = hybridCompact.filter((shard) =>
+      shard.groups.some((group) => /-hosted-\d+$/u.test(group.shard_name)),
+    );
+    expect(hybridStripeBins.length).toBeGreaterThan(0);
+    expect(
+      hybridStripeBins.every((shard) => (shard.predictedSeconds ?? Infinity) <= 150),
+      "synthesized hosted stripes must respect the hybrid body ceiling",
+    ).toBe(true);
+    // agents-core-models measured 56.3s (n=6) against a 36s scaled estimate, so
+    // packing it beside agents-core-runtime-hosted-1 (60.4s) built the only bin
+    // running >=1.25x its prediction: 122s of work priced at 88s. The measured
+    // hybrid hint separates them; without it they pack together again.
+    const modelsBin = hybridCompact.find((shard) =>
+      shard.groups.some((group) => group.shard_name === "agentic-agents-core-models"),
+    );
+    expect(modelsBin?.groups.map((group) => group.shard_name)).not.toContain(
+      "agentic-agents-core-runtime-hosted-1",
     );
     expect(compact.every((shard) => Array.isArray(shard.groups))).toBe(true);
     expect(compact.every((shard) => shard.groups.length <= 10)).toBe(true);