fix(agent-graph): stabilize drag and pan interactions

packages/agent-graph/src/hooks/useGraphCamera.ts

@@ -4,7 +4,7 @@
  * All state in refs — no React re-renders.
  */
 
-import { useRef, useCallback } from 'react';
+import { useRef, useCallback, useMemo } from 'react';
 import type { GraphNode } from '../ports/types';
 import { CAMERA, ANIM, NODE, TASK_PILL } from '../constants/canvas-constants';
 import type { WorldBounds } from '../layout/launchAnchor';
@@ -170,17 +170,31 @@ export function useGraphCamera(): UseGraphCameraResult {
     t.zoom = Math.max(CAMERA.minZoom, t.zoom / 1.2);
   }, []);
 
-  return {
-    transformRef,
-    screenToWorld,
-    worldToScreen,
-    handleWheel,
-    handlePanStart,
-    handlePanMove,
-    handlePanEnd,
-    zoomToFit,
-    zoomIn,
-    zoomOut,
-    updateInertia,
-  };
+  return useMemo(
+    () => ({
+      transformRef,
+      screenToWorld,
+      worldToScreen,
+      handleWheel,
+      handlePanStart,
+      handlePanMove,
+      handlePanEnd,
+      zoomToFit,
+      zoomIn,
+      zoomOut,
+      updateInertia,
+    }),
+    [
+      screenToWorld,
+      worldToScreen,
+      handleWheel,
+      handlePanStart,
+      handlePanMove,
+      handlePanEnd,
+      zoomToFit,
+      zoomIn,
+      zoomOut,
+      updateInertia,
+    ]
+  );
 }

packages/agent-graph/src/hooks/useGraphInteraction.ts

@@ -3,7 +3,7 @@
  * Delegates hit testing to strategy pattern.
  */
 
-import { useRef, useCallback } from 'react';
+import { useRef, useCallback, useMemo } from 'react';
 import type { GraphNode } from '../ports/types';
 import { ANIM } from '../constants/canvas-constants';
 import { findNodeAt } from '../canvas/hit-detection';
@@ -81,13 +81,16 @@ export function useGraphInteraction(
     return findNodeAt(wx, wy, nodes);
   }, []);
 
-  return {
-    hoveredNodeId,
-    dragNodeId,
-    isDragging,
-    handleMouseDown,
-    handleMouseMove,
-    handleMouseUp,
-    handleDoubleClick,
-  };
+  return useMemo(
+    () => ({
+      hoveredNodeId,
+      dragNodeId,
+      isDragging,
+      handleMouseDown,
+      handleMouseMove,
+      handleMouseUp,
+      handleDoubleClick,
+    }),
+    [handleDoubleClick, handleMouseDown, handleMouseMove, handleMouseUp]
+  );
 }

packages/agent-graph/src/hooks/useGraphSimulation.ts

@@ -1,4 +1,4 @@
-import { useCallback, useEffect, useRef } from 'react';
+import { useCallback, useEffect, useMemo, useRef } from 'react';
 
 import { ANIM_SPEED, NODE } from '../constants/canvas-constants';
 import { getStateColor } from '../constants/colors';
@@ -239,19 +239,29 @@ export function useGraphSimulation(): UseGraphSimulationResult {
     };
   }, []);
 
-  return {
-    stateRef,
-    updateData,
-    tick,
-    setNodePosition,
-    clearNodePosition,
-    clearTransientOwnerPositions,
-    resolveNearestOwnerSlot,
-    getLaunchAnchorWorldPosition: (leadNodeId: string) =>
-      launchAnchorPositionsRef.current.get(leadNodeId) ?? null,
-    getActivityWorldRect: (nodeId: string) => activityRectByNodeIdRef.current.get(nodeId) ?? null,
-    getExtraWorldBounds: () => extraWorldBoundsRef.current,
-  };
+  return useMemo(
+    () => ({
+      stateRef,
+      updateData,
+      tick,
+      setNodePosition,
+      clearNodePosition,
+      clearTransientOwnerPositions,
+      resolveNearestOwnerSlot,
+      getLaunchAnchorWorldPosition: (leadNodeId: string) =>
+        launchAnchorPositionsRef.current.get(leadNodeId) ?? null,
+      getActivityWorldRect: (nodeId: string) => activityRectByNodeIdRef.current.get(nodeId) ?? null,
+      getExtraWorldBounds: () => extraWorldBoundsRef.current,
+    }),
+    [
+      updateData,
+      tick,
+      setNodePosition,
+      clearNodePosition,
+      clearTransientOwnerPositions,
+      resolveNearestOwnerSlot,
+    ]
+  );
 }
 
 function applySnapshotToNodes(

packages/agent-graph/src/ui/GraphView.tsx

@@ -32,7 +32,7 @@ import {
   findNodeAt,
   getEdgeMidpoint,
 } from '../canvas/hit-detection';
-import { ANIM_SPEED } from '../constants/canvas-constants';
+import { ANIM, ANIM_SPEED } from '../constants/canvas-constants';
 import { getLaunchAnchorScreenPlacement as buildLaunchAnchorScreenPlacement } from '../layout/launchAnchor';
 
 export interface GraphViewProps {
@@ -148,13 +148,6 @@ export function GraphView({
   // ─── Hooks ──────────────────────────────────────────────────────────────
   const simulation = useGraphSimulation();
   const camera = useGraphCamera();
-
-  // Stable refs for RAF loop (avoid recreating animate on hook identity change)
-  const simulationRef = useRef(simulation);
-  simulationRef.current = simulation;
-  const cameraRef = useRef(camera);
-  cameraRef.current = camera;
-
   const interaction = useGraphInteraction(
     useCallback(
       (nodeId: string, x: number, y: number) => {
@@ -164,6 +157,20 @@ export function GraphView({
     )
   );
 
+  // Stable refs for RAF loop (avoid recreating animate on hook identity change)
+  const simulationRef = useRef(simulation);
+  simulationRef.current = simulation;
+  const cameraRef = useRef(camera);
+  cameraRef.current = camera;
+  const interactionRef = useRef(interaction);
+  interactionRef.current = interaction;
+  const processActivePointerMoveRef = useRef<((clientX: number, clientY: number) => boolean) | null>(
+    null
+  );
+  const completePointerInteractionRef = useRef<((clientX: number, clientY: number) => void) | null>(
+    null
+  );
+
   const getVisibleNodes = useCallback(
     (nodes: GraphNode[]): GraphNode[] =>
       nodes.filter((node) => {
@@ -433,16 +440,16 @@ export function GraphView({
   }, []);
 
   useLayoutEffect(() => {
-    if (!isSurfaceActive) {
+    if (isSurfaceActive) {
       return;
     }
-    interaction.handleMouseUp();
-    simulation.clearTransientOwnerPositions();
+    interactionRef.current.handleMouseUp();
+    simulationRef.current.clearTransientOwnerPositions();
     dragPreviewRef.current = null;
     isPanningRef.current = false;
     edgeMouseDownRef.current = null;
     setInteractionGuards(false);
-  }, [interaction, isSurfaceActive, simulation]);
+  }, [isSurfaceActive, setInteractionGuards]);
 
   const handleWheel = useCallback(
     (e: WheelEvent) => {
@@ -454,7 +461,13 @@ export function GraphView({
 
   // ─── Mouse handlers (Figma-style: drag empty space = pan, drag node = move) ─
   const isPanningRef = useRef(false);
-  const edgeMouseDownRef = useRef<{ id: string; x: number; y: number } | null>(null);
+  const edgeMouseDownRef = useRef<{
+    id: string;
+    worldX: number;
+    worldY: number;
+    clientX: number;
+    clientY: number;
+  } | null>(null);
 
   const handleMouseDown = useCallback(
     (e: React.MouseEvent) => {
@@ -491,7 +504,13 @@ export function GraphView({
         if (hitEdge) {
           markUserInteracted();
           isPanningRef.current = false;
-          edgeMouseDownRef.current = { id: hitEdge, x: world.x, y: world.y };
+          edgeMouseDownRef.current = {
+            id: hitEdge,
+            worldX: world.x,
+            worldY: world.y,
+            clientX: e.clientX,
+            clientY: e.clientY,
+          };
           hoveredEdgeIdRef.current = hitEdge;
         } else {
           // Hit empty space → pan
@@ -518,11 +537,6 @@ export function GraphView({
 
   const processActivePointerMove = useCallback(
     (clientX: number, clientY: number) => {
-      if (!activePrimaryInteractionRef.current) {
-        dragPreviewRef.current = null;
-        return false;
-      }
-
       if (isPanningRef.current) {
         if (typeof document !== 'undefined') {
           document.getSelection()?.removeAllRanges();
@@ -531,6 +545,36 @@ export function GraphView({
         return true;
       }
 
+      const edgeMouseDown = edgeMouseDownRef.current;
+      if (
+        edgeMouseDown &&
+        !interaction.dragNodeId.current &&
+        !interaction.isDragging.current
+      ) {
+        const dx = clientX - edgeMouseDown.clientX;
+        const dy = clientY - edgeMouseDown.clientY;
+        if (dx * dx + dy * dy > ANIM.dragThresholdPx * ANIM.dragThresholdPx) {
+          if (typeof document !== 'undefined') {
+            document.getSelection()?.removeAllRanges();
+          }
+          hoveredEdgeIdRef.current = null;
+          edgeMouseDownRef.current = null;
+          isPanningRef.current = true;
+          camera.handlePanStart(edgeMouseDown.clientX, edgeMouseDown.clientY);
+          camera.handlePanMove(clientX, clientY);
+          return true;
+        }
+      }
+
+      if (
+        !activePrimaryInteractionRef.current &&
+        !interaction.dragNodeId.current &&
+        !interaction.isDragging.current
+      ) {
+        dragPreviewRef.current = null;
+        return false;
+      }
+
       const canvas = canvasHandle.current?.getCanvas();
       if (!canvas) {
         dragPreviewRef.current = null;
@@ -627,8 +671,8 @@ export function GraphView({
         if (canvas && edgeMouseDownRef.current && !interaction.isDragging.current) {
           const rect = canvas.getBoundingClientRect();
           const world = camera.screenToWorld(clientX - rect.left, clientY - rect.top);
-          const dx = world.x - edgeMouseDownRef.current.x;
-          const dy = world.y - edgeMouseDownRef.current.y;
+          const dx = world.x - edgeMouseDownRef.current.worldX;
+          const dy = world.y - edgeMouseDownRef.current.worldY;
           if (dx * dx + dy * dy <= 25) {
             clickedEdgeId = edgeMouseDownRef.current.id;
           }
@@ -656,6 +700,8 @@ export function GraphView({
     },
     [camera, events, interaction, onOwnerSlotDrop, setInteractionGuards, simulation]
   );
+  processActivePointerMoveRef.current = processActivePointerMove;
+  completePointerInteractionRef.current = completePointerInteraction;
 
   const handleMouseMove = useCallback(
     (e: React.MouseEvent) => {
@@ -711,36 +757,40 @@ export function GraphView({
       if (
         !activePrimaryInteractionRef.current &&
         !isPanningRef.current &&
-        !interaction.dragNodeId.current &&
-        !interaction.isDragging.current &&
+        !interactionRef.current.dragNodeId.current &&
+        !interactionRef.current.isDragging.current &&
         !edgeMouseDownRef.current
       ) {
         return;
       }
       event.preventDefault();
-      processActivePointerMove(event.clientX, event.clientY);
+      processActivePointerMoveRef.current?.(event.clientX, event.clientY);
     };
 
     const handleWindowMouseUp = (event: MouseEvent): void => {
       if (
         !activePrimaryInteractionRef.current &&
         !isPanningRef.current &&
-        !interaction.dragNodeId.current &&
-        !interaction.isDragging.current &&
+        !interactionRef.current.dragNodeId.current &&
+        !interactionRef.current.isDragging.current &&
         !edgeMouseDownRef.current
       ) {
         setInteractionGuards(false);
         return;
       }
-      completePointerInteraction(event.clientX, event.clientY);
+      completePointerInteractionRef.current?.(event.clientX, event.clientY);
     };
 
     const clearInteraction = (): void => {
-      if (!activePrimaryInteractionRef.current && !isPanningRef.current && !interaction.isDragging.current) {
+      if (
+        !activePrimaryInteractionRef.current &&
+        !isPanningRef.current &&
+        !interactionRef.current.isDragging.current
+      ) {
         return;
       }
-      interaction.handleMouseUp();
-      camera.handlePanEnd();
+      interactionRef.current.handleMouseUp();
+      cameraRef.current.handlePanEnd();
       isPanningRef.current = false;
       edgeMouseDownRef.current = null;
       dragPreviewRef.current = null;
@@ -756,9 +806,14 @@ export function GraphView({
       window.removeEventListener('mouseup', handleWindowMouseUp);
       window.removeEventListener('blur', clearInteraction);
       window.removeEventListener('dragstart', clearInteraction);
+    };
+  }, [setInteractionGuards]);
+
+  useEffect(() => {
+    return () => {
       setInteractionGuards(false);
     };
-  }, [camera, completePointerInteraction, interaction, processActivePointerMove, setInteractionGuards]);
+  }, [setInteractionGuards]);
 
   const handleDoubleClick = useCallback(
     (e: React.MouseEvent) => {

test/renderer/features/agent-graph/GraphView.test.ts

@@ -0,0 +1,400 @@
+import React, { act } from 'react';
+import { createRoot, type Root } from 'react-dom/client';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+import type { GraphEdge, GraphNode } from '@claude-teams/agent-graph';
+
+import { getEdgeMidpoint } from '../../../../packages/agent-graph/src/canvas/hit-detection';
+
+const hoisted = vi.hoisted(() => ({
+  handlePanStart: vi.fn(),
+  handlePanMove: vi.fn(),
+  handlePanEnd: vi.fn(),
+  zoomToFit: vi.fn(),
+  zoomIn: vi.fn(),
+  zoomOut: vi.fn(),
+  updateInertia: vi.fn(),
+  interaction: {
+    hoveredNodeId: { current: null as string | null },
+    dragNodeId: { current: null as string | null },
+    isDragging: { current: false },
+    handleMouseDown: vi.fn(),
+    handleMouseMove: vi.fn(),
+    handleMouseUp: vi.fn(() => null),
+    handleDoubleClick: vi.fn(() => null),
+  },
+  simulationState: {
+    nodes: [] as GraphNode[],
+    edges: [] as GraphEdge[],
+    particles: [],
+    effects: [],
+    time: 0,
+  },
+  clearTransientOwnerPositions: vi.fn(),
+}));
+
+vi.mock('../../../../packages/agent-graph/src/hooks/useGraphCamera', () => ({
+  useGraphCamera: () => ({
+    transformRef: { current: { x: 0, y: 0, zoom: 1 } },
+    screenToWorld: (sx: number, sy: number) => ({ x: sx, y: sy }),
+    worldToScreen: (wx: number, wy: number) => ({ x: wx, y: wy }),
+    handleWheel: vi.fn(),
+    handlePanStart: hoisted.handlePanStart,
+    handlePanMove: hoisted.handlePanMove,
+    handlePanEnd: hoisted.handlePanEnd,
+    zoomToFit: hoisted.zoomToFit,
+    zoomIn: hoisted.zoomIn,
+    zoomOut: hoisted.zoomOut,
+    updateInertia: hoisted.updateInertia,
+  }),
+}));
+
+vi.mock('../../../../packages/agent-graph/src/hooks/useGraphInteraction', () => ({
+  useGraphInteraction: () => hoisted.interaction,
+}));
+
+vi.mock('../../../../packages/agent-graph/src/hooks/useGraphSimulation', () => ({
+  useGraphSimulation: () => ({
+    stateRef: { current: hoisted.simulationState },
+    updateData: vi.fn(),
+    tick: vi.fn(),
+    getExtraWorldBounds: vi.fn(() => []),
+    getLaunchAnchorWorldPosition: vi.fn(() => null),
+    getActivityWorldRect: vi.fn(() => null),
+    resolveNearestOwnerSlot: vi.fn(() => null),
+    clearNodePosition: vi.fn(),
+    clearTransientOwnerPositions: hoisted.clearTransientOwnerPositions,
+    setNodePosition: vi.fn(),
+  }),
+}));
+
+vi.mock('../../../../packages/agent-graph/src/ui/GraphControls', () => ({
+  GraphControls: () => null,
+}));
+
+vi.mock('../../../../packages/agent-graph/src/ui/GraphOverlay', () => ({
+  GraphOverlay: () => null,
+}));
+
+vi.mock('../../../../packages/agent-graph/src/ui/GraphEdgeOverlay', () => ({
+  GraphEdgeOverlay: () => null,
+}));
+
+import { GraphView } from '../../../../packages/agent-graph/src/ui/GraphView';
+
+describe('GraphView pan interactions', () => {
+  let container: HTMLDivElement;
+  let root: Root;
+  let originalGetBoundingClientRect: typeof HTMLCanvasElement.prototype.getBoundingClientRect;
+
+  beforeEach(() => {
+    vi.clearAllMocks();
+    vi.stubGlobal('IS_REACT_ACT_ENVIRONMENT', true);
+    hoisted.interaction.hoveredNodeId.current = null;
+    hoisted.interaction.dragNodeId.current = null;
+    hoisted.interaction.isDragging.current = false;
+    hoisted.simulationState.nodes = [];
+    hoisted.simulationState.edges = [];
+    vi.stubGlobal(
+      'ResizeObserver',
+      class {
+        observe(): void {}
+        disconnect(): void {}
+      }
+    );
+    vi.stubGlobal('requestAnimationFrame', vi.fn(() => 1));
+    vi.stubGlobal('cancelAnimationFrame', vi.fn());
+    container = document.createElement('div');
+    document.body.appendChild(container);
+    root = createRoot(container);
+    originalGetBoundingClientRect = HTMLCanvasElement.prototype.getBoundingClientRect;
+    HTMLCanvasElement.prototype.getBoundingClientRect = function getBoundingClientRect(): DOMRect {
+      return DOMRect.fromRect({ x: 0, y: 0, width: 800, height: 600 });
+    };
+  });
+
+  afterEach(async () => {
+    await act(async () => {
+      root.unmount();
+    });
+    container.remove();
+    HTMLCanvasElement.prototype.getBoundingClientRect = originalGetBoundingClientRect;
+    vi.unstubAllGlobals();
+  });
+
+  it('starts panning when dragging from a hit-tested edge instead of getting stuck on edge selection', async () => {
+    const source: GraphNode = {
+      id: 'member:alice',
+      kind: 'member',
+      label: 'alice',
+      state: 'idle',
+      x: 0,
+      y: 0,
+      domainRef: { kind: 'member', teamName: 'demo-team', memberName: 'alice' },
+    };
+    const target: GraphNode = {
+      id: 'task:1',
+      kind: 'task',
+      label: 'Task 1',
+      state: 'idle',
+      x: 160,
+      y: 90,
+      domainRef: { kind: 'task', teamName: 'demo-team', taskId: 'task:1' },
+    };
+    const edge: GraphEdge = {
+      id: 'edge:blocking',
+      source: source.id,
+      target: target.id,
+      type: 'blocking',
+    };
+    hoisted.simulationState.nodes = [source, target];
+    hoisted.simulationState.edges = [edge];
+
+    const midpoint = getEdgeMidpoint(edge, new Map([
+      [source.id, source],
+      [target.id, target],
+    ]));
+    expect(midpoint).not.toBeNull();
+
+    await act(async () => {
+      root.render(
+        React.createElement(GraphView, {
+          data: {
+            teamName: 'demo-team',
+            nodes: [source, target],
+            edges: [edge],
+            particles: [],
+          },
+          config: { animationEnabled: false },
+        })
+      );
+    });
+
+    const canvas = container.querySelector('canvas');
+    expect(canvas).not.toBeNull();
+
+    await act(async () => {
+      canvas!.dispatchEvent(
+        new MouseEvent('mousedown', {
+          bubbles: true,
+          button: 0,
+          clientX: midpoint!.x,
+          clientY: midpoint!.y,
+        })
+      );
+      canvas!.dispatchEvent(
+        new MouseEvent('mousemove', {
+          bubbles: true,
+          buttons: 1,
+          clientX: midpoint!.x + 24,
+          clientY: midpoint!.y + 4,
+        })
+      );
+    });
+
+    expect(hoisted.handlePanStart).toHaveBeenCalledWith(midpoint!.x, midpoint!.y);
+    expect(hoisted.handlePanMove).toHaveBeenCalledWith(midpoint!.x + 24, midpoint!.y + 4);
+  });
+
+  it('does not clear pan state on the rerender triggered by interaction lock', async () => {
+    const source: GraphNode = {
+      id: 'member:alice',
+      kind: 'member',
+      label: 'alice',
+      state: 'idle',
+      x: 0,
+      y: 0,
+      domainRef: { kind: 'member', teamName: 'demo-team', memberName: 'alice' },
+    };
+    hoisted.simulationState.nodes = [source];
+    hoisted.simulationState.edges = [];
+
+    await act(async () => {
+      root.render(
+        React.createElement(GraphView, {
+          data: {
+            teamName: 'demo-team',
+            nodes: [source],
+            edges: [],
+            particles: [],
+          },
+          config: { animationEnabled: false },
+        })
+      );
+    });
+
+    const canvas = container.querySelector('canvas');
+    expect(canvas).not.toBeNull();
+
+    await act(async () => {
+      canvas!.dispatchEvent(
+        new MouseEvent('mousedown', {
+          bubbles: true,
+          button: 0,
+          clientX: 320,
+          clientY: 220,
+        })
+      );
+      await Promise.resolve();
+    });
+
+    await act(async () => {
+      canvas!.dispatchEvent(
+        new MouseEvent('mousemove', {
+          bubbles: true,
+          buttons: 1,
+          clientX: 352,
+          clientY: 248,
+        })
+      );
+    });
+
+    expect(hoisted.handlePanStart).toHaveBeenCalledWith(320, 220);
+    expect(hoisted.handlePanMove).toHaveBeenCalledWith(352, 248);
+  });
+
+  it('does not force-handleMouseUp when props rerender during an active member drag', async () => {
+    const source: GraphNode = {
+      id: 'member:demo-team:alice',
+      kind: 'member',
+      label: 'alice',
+      state: 'idle',
+      x: 80,
+      y: 80,
+      domainRef: { kind: 'member', teamName: 'demo-team', memberName: 'alice' },
+    };
+    hoisted.simulationState.nodes = [source];
+    hoisted.simulationState.edges = [];
+    hoisted.interaction.handleMouseDown.mockImplementation(() => {
+      hoisted.interaction.dragNodeId.current = source.id;
+    });
+    hoisted.interaction.handleMouseMove.mockImplementation(() => {
+      hoisted.interaction.isDragging.current = true;
+    });
+
+    const firstEvents = {};
+    const secondEvents = {};
+
+    await act(async () => {
+      root.render(
+        React.createElement(GraphView, {
+          data: {
+            teamName: 'demo-team',
+            nodes: [source],
+            edges: [],
+            particles: [],
+          },
+          events: firstEvents,
+          config: { animationEnabled: false },
+        })
+      );
+    });
+
+    const canvas = container.querySelector('canvas');
+    expect(canvas).not.toBeNull();
+
+    await act(async () => {
+      canvas!.dispatchEvent(
+        new MouseEvent('mousedown', {
+          bubbles: true,
+          button: 0,
+          clientX: 80,
+          clientY: 80,
+        })
+      );
+      canvas!.dispatchEvent(
+        new MouseEvent('mousemove', {
+          bubbles: true,
+          buttons: 1,
+          clientX: 95,
+          clientY: 95,
+        })
+      );
+    });
+
+    expect(hoisted.interaction.isDragging.current).toBe(true);
+
+    await act(async () => {
+      root.render(
+        React.createElement(GraphView, {
+          data: {
+            teamName: 'demo-team',
+            nodes: [source],
+            edges: [],
+            particles: [],
+          },
+          events: secondEvents,
+          config: { animationEnabled: false },
+        })
+      );
+    });
+
+    expect(hoisted.interaction.handleMouseUp).not.toHaveBeenCalled();
+
+    await act(async () => {
+      window.dispatchEvent(
+        new MouseEvent('mousemove', {
+          bubbles: true,
+          buttons: 1,
+          clientX: 112,
+          clientY: 112,
+        })
+      );
+    });
+
+    expect(hoisted.interaction.handleMouseMove).toHaveBeenCalled();
+    expect(hoisted.interaction.isDragging.current).toBe(true);
+  });
+
+  it('clears drag state when the graph surface becomes inactive', async () => {
+    const source: GraphNode = {
+      id: 'member:demo-team:alice',
+      kind: 'member',
+      label: 'alice',
+      state: 'idle',
+      x: 80,
+      y: 80,
+      domainRef: { kind: 'member', teamName: 'demo-team', memberName: 'alice' },
+    };
+    hoisted.simulationState.nodes = [source];
+    hoisted.simulationState.edges = [];
+    hoisted.interaction.dragNodeId.current = source.id;
+    hoisted.interaction.isDragging.current = true;
+
+    await act(async () => {
+      root.render(
+        React.createElement(GraphView, {
+          data: {
+            teamName: 'demo-team',
+            nodes: [source],
+            edges: [],
+            particles: [],
+          },
+          config: { animationEnabled: false },
+          isSurfaceActive: true,
+        })
+      );
+    });
+
+    expect(hoisted.interaction.handleMouseUp).not.toHaveBeenCalled();
+    expect(hoisted.clearTransientOwnerPositions).not.toHaveBeenCalled();
+
+    await act(async () => {
+      root.render(
+        React.createElement(GraphView, {
+          data: {
+            teamName: 'demo-team',
+            nodes: [source],
+            edges: [],
+            particles: [],
+          },
+          config: { animationEnabled: false },
+          isSurfaceActive: false,
+        })
+      );
+    });
+
+    expect(hoisted.interaction.handleMouseUp).toHaveBeenCalledTimes(1);
+    expect(hoisted.clearTransientOwnerPositions).toHaveBeenCalledTimes(1);
+  });
+});

test/renderer/features/agent-graph/useGraphCamera.test.ts

@@ -7,15 +7,29 @@ import { useGraphCamera, type UseGraphCameraResult } from '../../../../packages/
 import type { GraphNode } from '@claude-teams/agent-graph';
 
 let capturedCamera: UseGraphCameraResult | null = null;
+let firstCamera: UseGraphCameraResult | null = null;
+let secondCamera: UseGraphCameraResult | null = null;
 
 function CameraHarness(): React.JSX.Element | null {
   capturedCamera = useGraphCamera();
   return null;
 }
 
+function CameraIdentityHarness({ pass }: { pass: number }): React.JSX.Element | null {
+  const camera = useGraphCamera();
+  if (pass === 1) {
+    firstCamera = camera;
+  } else {
+    secondCamera = camera;
+  }
+  return null;
+}
+
 describe('useGraphCamera zoomToFit', () => {
   afterEach(() => {
     capturedCamera = null;
+    firstCamera = null;
+    secondCamera = null;
     document.body.innerHTML = '';
   });
 
@@ -71,4 +85,29 @@ describe('useGraphCamera zoomToFit', () => {
       await Promise.resolve();
     });
   });
+
+  it('returns a referentially stable result across rerenders', async () => {
+    vi.stubGlobal('IS_REACT_ACT_ENVIRONMENT', true);
+    const host = document.createElement('div');
+    document.body.appendChild(host);
+    const root = createRoot(host);
+
+    await act(async () => {
+      root.render(React.createElement(CameraIdentityHarness, { pass: 1 }));
+      await Promise.resolve();
+    });
+
+    await act(async () => {
+      root.render(React.createElement(CameraIdentityHarness, { pass: 2 }));
+      await Promise.resolve();
+    });
+
+    expect(firstCamera).toBeTruthy();
+    expect(secondCamera).toBe(firstCamera);
+
+    await act(async () => {
+      root.unmount();
+      await Promise.resolve();
+    });
+  });
 });

test/renderer/features/agent-graph/useGraphInteraction.test.ts

@@ -0,0 +1,51 @@
+import React, { act } from 'react';
+import { createRoot } from 'react-dom/client';
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+import { useGraphInteraction, type UseGraphInteractionResult } from '../../../../packages/agent-graph/src/hooks/useGraphInteraction';
+
+let firstInteraction: UseGraphInteractionResult | null = null;
+let secondInteraction: UseGraphInteractionResult | null = null;
+
+function InteractionHarness({ pass }: { pass: number }): React.JSX.Element | null {
+  const interaction = useGraphInteraction();
+  if (pass === 1) {
+    firstInteraction = interaction;
+  } else {
+    secondInteraction = interaction;
+  }
+  return null;
+}
+
+describe('useGraphInteraction', () => {
+  afterEach(() => {
+    firstInteraction = null;
+    secondInteraction = null;
+    document.body.innerHTML = '';
+  });
+
+  it('returns a referentially stable result across rerenders', async () => {
+    vi.stubGlobal('IS_REACT_ACT_ENVIRONMENT', true);
+    const host = document.createElement('div');
+    document.body.appendChild(host);
+    const root = createRoot(host);
+
+    await act(async () => {
+      root.render(React.createElement(InteractionHarness, { pass: 1 }));
+      await Promise.resolve();
+    });
+
+    await act(async () => {
+      root.render(React.createElement(InteractionHarness, { pass: 2 }));
+      await Promise.resolve();
+    });
+
+    expect(firstInteraction).toBeTruthy();
+    expect(secondInteraction).toBe(firstInteraction);
+
+    await act(async () => {
+      root.unmount();
+      await Promise.resolve();
+    });
+  });
+});

test/renderer/features/agent-graph/useGraphSimulationIdentity.test.ts

@@ -0,0 +1,51 @@
+import React, { act } from 'react';
+import { createRoot } from 'react-dom/client';
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+import { useGraphSimulation, type UseGraphSimulationResult } from '../../../../packages/agent-graph/src/hooks/useGraphSimulation';
+
+let firstSimulation: UseGraphSimulationResult | null = null;
+let secondSimulation: UseGraphSimulationResult | null = null;
+
+function SimulationHarness({ pass }: { pass: number }): React.JSX.Element | null {
+  const simulation = useGraphSimulation();
+  if (pass === 1) {
+    firstSimulation = simulation;
+  } else {
+    secondSimulation = simulation;
+  }
+  return null;
+}
+
+describe('useGraphSimulation', () => {
+  afterEach(() => {
+    firstSimulation = null;
+    secondSimulation = null;
+    document.body.innerHTML = '';
+  });
+
+  it('returns a referentially stable result across rerenders', async () => {
+    vi.stubGlobal('IS_REACT_ACT_ENVIRONMENT', true);
+    const host = document.createElement('div');
+    document.body.appendChild(host);
+    const root = createRoot(host);
+
+    await act(async () => {
+      root.render(React.createElement(SimulationHarness, { pass: 1 }));
+      await Promise.resolve();
+    });
+
+    await act(async () => {
+      root.render(React.createElement(SimulationHarness, { pass: 2 }));
+      await Promise.resolve();
+    });
+
+    expect(firstSimulation).toBeTruthy();
+    expect(secondSimulation).toBe(firstSimulation);
+
+    await act(async () => {
+      root.unmount();
+      await Promise.resolve();
+    });
+  });
+});