diff --git a/understand-anything-plugin/packages/dashboard/src/utils/__tests__/edgeAggregation.test.ts b/understand-anything-plugin/packages/dashboard/src/utils/__tests__/edgeAggregation.test.ts
new file mode 100644
index 0000000..54b6323
--- /dev/null
+++ b/understand-anything-plugin/packages/dashboard/src/utils/__tests__/edgeAggregation.test.ts
@@ -0,0 +1,61 @@
+import { describe, it, expect } from "vitest";
+import { aggregateContainerEdges } from "../edgeAggregation";
+import type { GraphEdge } from "@understand-anything/core/types";
+
+const ce = (source: string, target: string, type: string = "calls"): GraphEdge =>
+  ({ source, target, type }) as GraphEdge;
+
+describe("aggregateContainerEdges", () => {
+  it("returns empty arrays for empty input", () => {
+    const r = aggregateContainerEdges([], new Map());
+    expect(r.intraContainer).toEqual([]);
+    expect(r.interContainerAggregated).toEqual([]);
+  });
+
+  it("preserves intra-container edges as-is", () => {
+    const m = new Map([
+      ["a", "auth"],
+      ["b", "auth"],
+    ]);
+    const r = aggregateContainerEdges([ce("a", "b")], m);
+    expect(r.intraContainer).toHaveLength(1);
+    expect(r.interContainerAggregated).toEqual([]);
+  });
+
+  it("merges multiple same-direction inter edges into one", () => {
+    const m = new Map([
+      ["a", "auth"],
+      ["b", "auth"],
+      ["c", "cart"],
+      ["d", "cart"],
+    ]);
+    const edges = [ce("a", "c"), ce("a", "d"), ce("b", "c", "imports")];
+    const r = aggregateContainerEdges(edges, m);
+    expect(r.interContainerAggregated).toHaveLength(1);
+    const agg = r.interContainerAggregated[0];
+    expect(agg.sourceContainerId).toBe("auth");
+    expect(agg.targetContainerId).toBe("cart");
+    expect(agg.count).toBe(3);
+    expect(agg.types.sort()).toEqual(["calls", "imports"]);
+  });
+
+  it("treats opposite directions as separate aggregated edges", () => {
+    const m = new Map([
+      ["a", "auth"],
+      ["c", "cart"],
+    ]);
+    const r = aggregateContainerEdges([ce("a", "c"), ce("c", "a")], m);
+    expect(r.interContainerAggregated).toHaveLength(2);
+    const dirs = r.interContainerAggregated.map(
+      (e) => `${e.sourceContainerId}→${e.targetContainerId}`,
+    );
+    expect(dirs.sort()).toEqual(["auth→cart", "cart→auth"]);
+  });
+
+  it("ignores edges whose endpoints have no container mapping", () => {
+    const m = new Map([["a", "auth"]]);
+    const r = aggregateContainerEdges([ce("a", "z")], m);
+    expect(r.intraContainer).toEqual([]);
+    expect(r.interContainerAggregated).toEqual([]);
+  });
+});
diff --git a/understand-anything-plugin/packages/dashboard/src/utils/edgeAggregation.ts b/understand-anything-plugin/packages/dashboard/src/utils/edgeAggregation.ts
index 29b72d5..5bbeee8 100644
--- a/understand-anything-plugin/packages/dashboard/src/utils/edgeAggregation.ts
+++ b/understand-anything-plugin/packages/dashboard/src/utils/edgeAggregation.ts
@@ -1,4 +1,4 @@
-import type { KnowledgeGraph } from "@understand-anything/core/types";
+import type { GraphEdge, KnowledgeGraph } from "@understand-anything/core/types";
 
 export interface LayerEdgeAggregation {
   sourceLayerId: string;
@@ -133,3 +133,73 @@ export function findCrossLayerFileNodes(
   }
   return result;
 }
+
+export interface AggregatedContainerEdge {
+  sourceContainerId: string;
+  targetContainerId: string;
+  count: number;
+  types: string[];
+}
+
+export interface ContainerEdgeBuckets {
+  intraContainer: GraphEdge[];
+  interContainerAggregated: AggregatedContainerEdge[];
+}
+
+/**
+ * Bucket edges into intra-container (preserved) and inter-container
+ * (aggregated by directed (source,target) container pair).
+ *
+ * Direction is significant: A→B and B→A produce two independent
+ * aggregated edges. Edges whose endpoints have no container mapping
+ * are dropped (treat them as pre-filtered).
+ */
+export function aggregateContainerEdges(
+  edges: GraphEdge[],
+  nodeToContainer: Map<string, string>,
+): ContainerEdgeBuckets {
+  const intra: GraphEdge[] = [];
+  const interMap = new Map<
+    string,
+    {
+      sourceContainerId: string;
+      targetContainerId: string;
+      count: number;
+      types: Set<string>;
+    }
+  >();
+
+  for (const e of edges) {
+    const sc = nodeToContainer.get(e.source);
+    const tc = nodeToContainer.get(e.target);
+    if (!sc || !tc) continue;
+    if (sc === tc) {
+      intra.push(e);
+      continue;
+    }
+    const key = `${sc} ${tc}`;
+    const existing = interMap.get(key);
+    if (existing) {
+      existing.count++;
+      existing.types.add(e.type);
+    } else {
+      interMap.set(key, {
+        sourceContainerId: sc,
+        targetContainerId: tc,
+        count: 1,
+        types: new Set([e.type]),
+      });
+    }
+  }
+
+  const interContainerAggregated: AggregatedContainerEdge[] = [...interMap.values()].map(
+    (v) => ({
+      sourceContainerId: v.sourceContainerId,
+      targetContainerId: v.targetContainerId,
+      count: v.count,
+      types: [...v.types],
+    }),
+  );
+
+  return { intraContainer: intra, interContainerAggregated };
+}