diff --git a/packages/memory-graph/src/components/legend.tsx b/packages/memory-graph/src/components/legend.tsx
index 32c520af8..7d4b9d47c 100644
--- a/packages/memory-graph/src/components/legend.tsx
+++ b/packages/memory-graph/src/components/legend.tsx
@@ -81,13 +81,16 @@ function LineIcon({
 	)
 }
 
-function ClusterSwatches() {
-	const swatches = ["#58C7E8", "#E7BC52", "#74D680", "#D47B75", "#A789E8"]
+function ClusterSwatches({ colors }: { colors: GraphThemeColors }) {
+	const swatches =
+		colors.clusterColors.length > 0
+			? colors.clusterColors.slice(0, 5)
+			: [colors.memStrokeDefault]
 	return (
 		<div style={{ display: "flex", gap: 2, flexShrink: 0 }}>
-			{swatches.map((color) => (
+			{swatches.map((color, index) => (
 				<span
-					key={color}
+					key={`${color}-${index}`}
 					style={{
 						width: 7,
 						height: 12,
@@ -563,7 +566,7 @@ export const Legend = memo(function Legend({
 							<div style={{ display: "flex", flexDirection: "column", gap: 8 }}>
 								<span style={sectionLabelStyle}>Color</span>
 								<div style={statusRowStyle}>
-									<ClusterSwatches />
+									<ClusterSwatches colors={colors} />
 									<div
 										style={{
 											display: "flex",
diff --git a/packages/memory-graph/src/constants.ts b/packages/memory-graph/src/constants.ts
index fcfe36508..4c1bca1c2 100644
--- a/packages/memory-graph/src/constants.ts
+++ b/packages/memory-graph/src/constants.ts
@@ -1,5 +1,18 @@
 import type { GraphThemeColors } from "./types"
 
+export const DEFAULT_CLUSTER_COLORS = [
+	"#58C7E8",
+	"#E7BC52",
+	"#74D680",
+	"#D47B75",
+	"#A789E8",
+	"#62C5A8",
+	"#74ABD8",
+	"#C78AC8",
+	"#D18A58",
+	"#8BCB6F",
+]
+
 export const MEMORY_BORDER_KEYS = {
 	forgotten: "memBorderForgotten",
 	expiring: "memBorderExpiring",
@@ -66,4 +79,5 @@ export const DEFAULT_COLORS: GraphThemeColors = {
 	popoverTextMuted: "#94a3b8",
 	controlBg: "#1a1f29",
 	controlBorder: "#2A2F36",
+	clusterColors: DEFAULT_CLUSTER_COLORS,
 }
diff --git a/packages/memory-graph/src/hooks/use-graph-data.ts b/packages/memory-graph/src/hooks/use-graph-data.ts
index 00a05d10c..e848618d2 100644
--- a/packages/memory-graph/src/hooks/use-graph-data.ts
+++ b/packages/memory-graph/src/hooks/use-graph-data.ts
@@ -8,6 +8,7 @@ import type {
 	GraphThemeColors,
 	MemoryNodeData,
 } from "../types"
+import { DEFAULT_CLUSTER_COLORS } from "../constants"
 import { hashString } from "../utils/hash"
 
 const SEVEN_DAYS_MS = 7 * 24 * 60 * 60 * 1000
@@ -21,19 +22,6 @@ const APPEND_CANDIDATES_PER_RING = 18
 const APPEND_MAX_RINGS = 8
 const APPEND_SPATIAL_CELL_SIZE = APPEND_CLUSTER_RADIUS + APPEND_AREA_GAP + 120
 const GOLDEN_ANGLE = Math.PI * (3 - Math.sqrt(5))
-const CLUSTER_COLORS = [
-	"#58C7E8",
-	"#E7BC52",
-	"#74D680",
-	"#D47B75",
-	"#A789E8",
-	"#62C5A8",
-	"#74ABD8",
-	"#C78AC8",
-	"#D18A58",
-	"#8BCB6F",
-]
-
 export interface ClusterAssignment {
 	key: string
 	color: string
@@ -107,12 +95,18 @@ function getMemoryRingCapacity(ring: number): number {
 	return Math.max(8, Math.floor((2 * Math.PI * radius) / MEMORY_ORBIT_SPACING))
 }
 
-export function getClusterColor(key: string): string {
-	return CLUSTER_COLORS[hashString(key) % CLUSTER_COLORS.length] as string
+export function getClusterColor(
+	key: string,
+	clusterColors: readonly string[] = DEFAULT_CLUSTER_COLORS,
+): string {
+	const palette =
+		clusterColors.length > 0 ? clusterColors : DEFAULT_CLUSTER_COLORS
+	return palette[hashString(key) % palette.length] as string
 }
 
 export function computeClusterAssignments(
 	documents: GraphApiDocument[],
+	clusterColors: readonly string[] = DEFAULT_CLUSTER_COLORS,
 ): Map<string, ClusterAssignment> {
 	const adjacency = new Map<string, Set<string>>()
 	const docByMemory = new Map<string, string>()
@@ -180,7 +174,7 @@ export function computeClusterAssignments(
 				: `relation:${firstDocId}:${firstId}`
 		const assignment = {
 			key,
-			color: getClusterColor(key),
+			color: getClusterColor(key, clusterColors),
 			size: component.length,
 		}
 
@@ -205,6 +199,7 @@ function getMemoryRelationTargets(mem: GraphApiMemory): Record<string, string> {
 function getDocumentClusterAssignment(
 	doc: GraphApiDocument,
 	assignments: Map<string, ClusterAssignment>,
+	clusterColors: readonly string[] = DEFAULT_CLUSTER_COLORS,
 ): ClusterAssignment {
 	const counts = new Map<
 		string,
@@ -229,7 +224,7 @@ function getDocumentClusterAssignment(
 	return (
 		best?.assignment ?? {
 			key: `doc:${doc.id}`,
-			color: getClusterColor(`doc:${doc.id}`),
+			color: getClusterColor(`doc:${doc.id}`, clusterColors),
 			size: 1,
 		}
 	)
@@ -492,7 +487,10 @@ export function useGraphData(
 				? buildAppendSpatialGrid(appendPlacementNodes)
 				: null
 		let appendIndex = 0
-		const clusterAssignments = computeClusterAssignments(documents)
+		const clusterAssignments = computeClusterAssignments(
+			documents,
+			colors.clusterColors,
+		)
 
 		const result: GraphNode[] = []
 		// Spiral layout: documents form a compact spiral core, memories orbit
@@ -509,7 +507,11 @@ export function useGraphData(
 
 		for (let docIdx = 0; docIdx < docCount; docIdx++) {
 			const doc = documents[docIdx]
-			const docCluster = getDocumentClusterAssignment(doc, clusterAssignments)
+			const docCluster = getDocumentClusterAssignment(
+				doc,
+				clusterAssignments,
+				colors.clusterColors,
+			)
 			const angle = docIdx * goldenAngle
 			const radius = spiralScale * Math.sqrt((docIdx + 1) / docCount)
 			const initialX = cx + Math.cos(angle) * radius
diff --git a/packages/memory-graph/src/hooks/use-graph-theme.ts b/packages/memory-graph/src/hooks/use-graph-theme.ts
index f045830a1..9f3cdb474 100644
--- a/packages/memory-graph/src/hooks/use-graph-theme.ts
+++ b/packages/memory-graph/src/hooks/use-graph-theme.ts
@@ -10,6 +10,19 @@ function readCssVar(name: string, fallback: string): string {
 	return val || fallback
 }
 
+function readCssColorList(name: string, fallback: string[]): string[] {
+	if (typeof document === "undefined") return fallback
+	const val = getComputedStyle(document.documentElement)
+		.getPropertyValue(name)
+		.trim()
+	if (!val) return fallback
+	const colors = val
+		.split(",")
+		.map((color) => color.trim())
+		.filter(Boolean)
+	return colors.length > 0 ? colors : fallback
+}
+
 function resolveColors(): GraphThemeColors {
 	return {
 		bg: readCssVar("--graph-bg", DEFAULT_COLORS.bg),
@@ -71,6 +84,10 @@ function resolveColors(): GraphThemeColors {
 			"--graph-control-border",
 			DEFAULT_COLORS.controlBorder,
 		),
+		clusterColors: readCssColorList(
+			"--graph-cluster-colors",
+			DEFAULT_COLORS.clusterColors,
+		),
 	}
 }
 
@@ -107,13 +124,13 @@ export function useGraphTheme(
 	const overrideKey = overrides
 		? Object.entries(overrides)
 				.sort(([a], [b]) => a.localeCompare(b))
-				.map(([k, v]) => `${k}:${v}`)
+				.map(([k, v]) => `${k}:${Array.isArray(v) ? v.join("|") : v}`)
 				.join(",")
 		: ""
 
+	// biome-ignore lint/correctness/useExhaustiveDependencies: overrideKey tracks overrides by value
 	const merged = useMemo(
 		() => (overrides ? { ...colors, ...overrides } : colors),
-		// biome-ignore lint/correctness/useExhaustiveDependencies: overrideKey tracks overrides by value
 		[colors, overrideKey],
 	)
 
diff --git a/packages/memory-graph/src/types.ts b/packages/memory-graph/src/types.ts
index b446a0232..9fd640737 100644
--- a/packages/memory-graph/src/types.ts
+++ b/packages/memory-graph/src/types.ts
@@ -130,6 +130,7 @@ export interface GraphThemeColors {
 	popoverTextMuted: string
 	controlBg: string
 	controlBorder: string
+	clusterColors: string[]
 }
 
 export interface GraphCanvasProps {