diff --git a/src/document/scene-document.ts b/src/document/scene-document.ts
index 3c267443..2346ef40 100644
--- a/src/document/scene-document.ts
+++ b/src/document/scene-document.ts
@@ -20,7 +20,8 @@ import {
 } from "./project-time-settings";
 import { type ScenePath } from "./paths";
 
-export const SCENE_DOCUMENT_VERSION = 44 as const;
+export const SCENE_DOCUMENT_VERSION = 45 as const;
+export const CONTROL_SURFACE_FOUNDATION_SCENE_DOCUMENT_VERSION = 45 as const;
 export const NPC_PRESENCE_SCENE_DOCUMENT_VERSION = 44 as const;
 export const PATH_FOUNDATION_SCENE_DOCUMENT_VERSION = 43 as const;
 export const NPC_COLLIDER_SCENE_DOCUMENT_VERSION = 42 as const;
diff --git a/src/interactions/interaction-links.ts b/src/interactions/interaction-links.ts
new file mode 100644
index 00000000..9fe9268e
--- /dev/null
+++ b/src/interactions/interaction-links.ts
@@ -0,0 +1,478 @@
+import { createOpaqueId } from "../core/ids";
+import {
+  areControlEffectsEqual,
+  cloneControlEffect,
+  createModelInstanceControlTargetRef,
+  createPlayModelAnimationControlEffect,
+  createPlaySoundControlEffect,
+  createSoundEmitterControlTargetRef,
+  createStopModelAnimationControlEffect,
+  createStopSoundControlEffect,
+  getControlEffectLabel,
+  type ControlEffect
+} from "../controls/control-surface";
+
+export const INTERACTION_TRIGGER_KINDS = ["enter", "exit", "click"] as const;
+export type InteractionTriggerKind = (typeof INTERACTION_TRIGGER_KINDS)[number];
+
+export interface TeleportPlayerAction {
+  type: "teleportPlayer";
+  targetEntityId: string;
+}
+
+export interface ToggleVisibilityAction {
+  type: "toggleVisibility";
+  targetBrushId: string;
+  visible?: boolean;
+}
+
+export interface PlayAnimationAction {
+  type: "playAnimation";
+  targetModelInstanceId: string;
+  clipName: string;
+  loop?: boolean;
+}
+
+export interface StopAnimationAction {
+  type: "stopAnimation";
+  targetModelInstanceId: string;
+}
+
+export interface PlaySoundAction {
+  type: "playSound";
+  targetSoundEmitterId: string;
+}
+
+export interface StopSoundAction {
+  type: "stopSound";
+  targetSoundEmitterId: string;
+}
+
+export interface ControlInteractionAction {
+  type: "control";
+  effect: ControlEffect;
+}
+
+export type InteractionAction =
+  | TeleportPlayerAction
+  | ToggleVisibilityAction
+  | PlayAnimationAction
+  | StopAnimationAction
+  | PlaySoundAction
+  | StopSoundAction
+  | ControlInteractionAction;
+
+export interface InteractionLink {
+  id: string;
+  sourceEntityId: string;
+  trigger: InteractionTriggerKind;
+  action: InteractionAction;
+}
+
+export interface CreateTeleportPlayerInteractionLinkOptions {
+  id?: string;
+  sourceEntityId: string;
+  trigger?: InteractionTriggerKind;
+  targetEntityId: string;
+}
+
+export interface CreateToggleVisibilityInteractionLinkOptions {
+  id?: string;
+  sourceEntityId: string;
+  trigger?: InteractionTriggerKind;
+  targetBrushId: string;
+  visible?: boolean;
+}
+
+export interface CreatePlayAnimationInteractionLinkOptions {
+  id?: string;
+  sourceEntityId: string;
+  trigger?: InteractionTriggerKind;
+  targetModelInstanceId: string;
+  clipName: string;
+  loop?: boolean;
+}
+
+export interface CreateStopAnimationInteractionLinkOptions {
+  id?: string;
+  sourceEntityId: string;
+  trigger?: InteractionTriggerKind;
+  targetModelInstanceId: string;
+}
+
+export interface CreatePlaySoundInteractionLinkOptions {
+  id?: string;
+  sourceEntityId: string;
+  trigger?: InteractionTriggerKind;
+  targetSoundEmitterId: string;
+}
+
+export interface CreateStopSoundInteractionLinkOptions {
+  id?: string;
+  sourceEntityId: string;
+  trigger?: InteractionTriggerKind;
+  targetSoundEmitterId: string;
+}
+
+export interface CreateControlInteractionLinkOptions {
+  id?: string;
+  sourceEntityId: string;
+  trigger?: InteractionTriggerKind;
+  effect: ControlEffect;
+}
+
+function assertNonEmptyString(value: string, label: string) {
+  if (value.trim().length === 0) {
+    throw new Error(`${label} must be non-empty.`);
+  }
+}
+
+function cloneAction(action: InteractionAction): InteractionAction {
+  switch (action.type) {
+    case "teleportPlayer":
+      return {
+        type: "teleportPlayer",
+        targetEntityId: action.targetEntityId
+      };
+    case "toggleVisibility":
+      return {
+        type: "toggleVisibility",
+        targetBrushId: action.targetBrushId,
+        visible: action.visible
+      };
+    case "playAnimation":
+      return {
+        type: "playAnimation",
+        targetModelInstanceId: action.targetModelInstanceId,
+        clipName: action.clipName,
+        loop: action.loop
+      };
+    case "stopAnimation":
+      return {
+        type: "stopAnimation",
+        targetModelInstanceId: action.targetModelInstanceId
+      };
+    case "playSound":
+      return {
+        type: "playSound",
+        targetSoundEmitterId: action.targetSoundEmitterId
+      };
+    case "stopSound":
+      return {
+        type: "stopSound",
+        targetSoundEmitterId: action.targetSoundEmitterId
+      };
+    case "control":
+      return {
+        type: "control",
+        effect: cloneControlEffect(action.effect)
+      };
+  }
+}
+
+export function isInteractionTriggerKind(
+  value: unknown
+): value is InteractionTriggerKind {
+  return value === "enter" || value === "exit" || value === "click";
+}
+
+export function isControlInteractionAction(
+  action: InteractionAction
+): action is ControlInteractionAction {
+  return action.type === "control";
+}
+
+export function createTeleportPlayerInteractionLink(
+  options: CreateTeleportPlayerInteractionLinkOptions
+): InteractionLink {
+  assertNonEmptyString(options.sourceEntityId, "Interaction source entity id");
+  assertNonEmptyString(options.targetEntityId, "Teleport target entity id");
+
+  return {
+    id: options.id ?? createOpaqueId("interaction-link"),
+    sourceEntityId: options.sourceEntityId,
+    trigger: options.trigger ?? "enter",
+    action: {
+      type: "teleportPlayer",
+      targetEntityId: options.targetEntityId
+    }
+  };
+}
+
+export function createToggleVisibilityInteractionLink(
+  options: CreateToggleVisibilityInteractionLinkOptions
+): InteractionLink {
+  assertNonEmptyString(options.sourceEntityId, "Interaction source entity id");
+  assertNonEmptyString(options.targetBrushId, "Visibility target brush id");
+
+  if (options.visible !== undefined && typeof options.visible !== "boolean") {
+    throw new Error("Visibility action visible must be a boolean when authored.");
+  }
+
+  return {
+    id: options.id ?? createOpaqueId("interaction-link"),
+    sourceEntityId: options.sourceEntityId,
+    trigger: options.trigger ?? "enter",
+    action: {
+      type: "toggleVisibility",
+      targetBrushId: options.targetBrushId,
+      visible: options.visible
+    }
+  };
+}
+
+export function createPlayAnimationInteractionLink(
+  options: CreatePlayAnimationInteractionLinkOptions
+): InteractionLink {
+  assertNonEmptyString(options.sourceEntityId, "Interaction source entity id");
+  assertNonEmptyString(
+    options.targetModelInstanceId,
+    "Play animation target model instance id"
+  );
+  assertNonEmptyString(options.clipName, "Play animation clip name");
+
+  return {
+    id: options.id ?? createOpaqueId("interaction-link"),
+    sourceEntityId: options.sourceEntityId,
+    trigger: options.trigger ?? "enter",
+    action: {
+      type: "playAnimation",
+      targetModelInstanceId: options.targetModelInstanceId,
+      clipName: options.clipName,
+      loop: options.loop
+    }
+  };
+}
+
+export function createStopAnimationInteractionLink(
+  options: CreateStopAnimationInteractionLinkOptions
+): InteractionLink {
+  assertNonEmptyString(options.sourceEntityId, "Interaction source entity id");
+  assertNonEmptyString(
+    options.targetModelInstanceId,
+    "Stop animation target model instance id"
+  );
+
+  return {
+    id: options.id ?? createOpaqueId("interaction-link"),
+    sourceEntityId: options.sourceEntityId,
+    trigger: options.trigger ?? "enter",
+    action: {
+      type: "stopAnimation",
+      targetModelInstanceId: options.targetModelInstanceId
+    }
+  };
+}
+
+export function createPlaySoundInteractionLink(
+  options: CreatePlaySoundInteractionLinkOptions
+): InteractionLink {
+  assertNonEmptyString(options.sourceEntityId, "Interaction source entity id");
+  assertNonEmptyString(
+    options.targetSoundEmitterId,
+    "Play sound target sound emitter id"
+  );
+
+  return {
+    id: options.id ?? createOpaqueId("interaction-link"),
+    sourceEntityId: options.sourceEntityId,
+    trigger: options.trigger ?? "enter",
+    action: {
+      type: "playSound",
+      targetSoundEmitterId: options.targetSoundEmitterId
+    }
+  };
+}
+
+export function createStopSoundInteractionLink(
+  options: CreateStopSoundInteractionLinkOptions
+): InteractionLink {
+  assertNonEmptyString(options.sourceEntityId, "Interaction source entity id");
+  assertNonEmptyString(
+    options.targetSoundEmitterId,
+    "Stop sound target sound emitter id"
+  );
+
+  return {
+    id: options.id ?? createOpaqueId("interaction-link"),
+    sourceEntityId: options.sourceEntityId,
+    trigger: options.trigger ?? "enter",
+    action: {
+      type: "stopSound",
+      targetSoundEmitterId: options.targetSoundEmitterId
+    }
+  };
+}
+
+export function createControlInteractionLink(
+  options: CreateControlInteractionLinkOptions
+): InteractionLink {
+  assertNonEmptyString(options.sourceEntityId, "Interaction source entity id");
+
+  return {
+    id: options.id ?? createOpaqueId("interaction-link"),
+    sourceEntityId: options.sourceEntityId,
+    trigger: options.trigger ?? "enter",
+    action: {
+      type: "control",
+      effect: cloneControlEffect(options.effect)
+    }
+  };
+}
+
+export function getInteractionActionControlEffect(
+  action: InteractionAction
+): ControlEffect | null {
+  switch (action.type) {
+    case "playAnimation":
+      return createPlayModelAnimationControlEffect({
+        target: createModelInstanceControlTargetRef(action.targetModelInstanceId),
+        clipName: action.clipName,
+        loop: action.loop
+      });
+    case "stopAnimation":
+      return createStopModelAnimationControlEffect({
+        target: createModelInstanceControlTargetRef(action.targetModelInstanceId)
+      });
+    case "playSound":
+      return createPlaySoundControlEffect({
+        target: createSoundEmitterControlTargetRef(action.targetSoundEmitterId)
+      });
+    case "stopSound":
+      return createStopSoundControlEffect({
+        target: createSoundEmitterControlTargetRef(action.targetSoundEmitterId)
+      });
+    case "control":
+      return cloneControlEffect(action.effect);
+    case "teleportPlayer":
+    case "toggleVisibility":
+      return null;
+  }
+}
+
+export function getInteractionActionLabel(action: InteractionAction): string {
+  switch (action.type) {
+    case "teleportPlayer":
+      return "Teleport Player";
+    case "toggleVisibility":
+      return "Toggle Visibility";
+    case "playAnimation":
+      return "Play Animation";
+    case "stopAnimation":
+      return "Stop Animation";
+    case "playSound":
+      return "Play Sound";
+    case "stopSound":
+      return "Stop Sound";
+    case "control":
+      return getControlEffectLabel(action.effect);
+  }
+}
+
+export function cloneInteractionLink(link: InteractionLink): InteractionLink {
+  return {
+    id: link.id,
+    sourceEntityId: link.sourceEntityId,
+    trigger: link.trigger,
+    action: cloneAction(link.action)
+  };
+}
+
+export function areInteractionLinksEqual(
+  left: InteractionLink,
+  right: InteractionLink
+): boolean {
+  if (
+    left.id !== right.id ||
+    left.sourceEntityId !== right.sourceEntityId ||
+    left.trigger !== right.trigger
+  ) {
+    return false;
+  }
+
+  if (left.action.type !== right.action.type) {
+    return false;
+  }
+
+  switch (left.action.type) {
+    case "teleportPlayer":
+      return (
+        left.action.targetEntityId ===
+        (right.action as TeleportPlayerAction).targetEntityId
+      );
+    case "toggleVisibility":
+      return (
+        left.action.targetBrushId ===
+          (right.action as ToggleVisibilityAction).targetBrushId &&
+        left.action.visible === (right.action as ToggleVisibilityAction).visible
+      );
+    case "playAnimation":
+      return (
+        left.action.targetModelInstanceId ===
+          (right.action as PlayAnimationAction).targetModelInstanceId &&
+        left.action.clipName === (right.action as PlayAnimationAction).clipName &&
+        left.action.loop === (right.action as PlayAnimationAction).loop
+      );
+    case "stopAnimation":
+      return (
+        left.action.targetModelInstanceId ===
+        (right.action as StopAnimationAction).targetModelInstanceId
+      );
+    case "playSound":
+      return (
+        left.action.targetSoundEmitterId ===
+        (right.action as PlaySoundAction).targetSoundEmitterId
+      );
+    case "stopSound":
+      return (
+        left.action.targetSoundEmitterId ===
+        (right.action as StopSoundAction).targetSoundEmitterId
+      );
+    case "control":
+      return areControlEffectsEqual(
+        left.action.effect,
+        (right.action as ControlInteractionAction).effect
+      );
+  }
+}
+
+export function cloneInteractionLinkRegistry(
+  links: Record<string, InteractionLink>
+): Record<string, InteractionLink> {
+  return Object.fromEntries(
+    Object.entries(links).map(([linkId, link]) => [
+      linkId,
+      cloneInteractionLink(link)
+    ])
+  );
+}
+
+export function compareInteractionLinks(
+  left: InteractionLink,
+  right: InteractionLink
+): number {
+  if (left.sourceEntityId !== right.sourceEntityId) {
+    return left.sourceEntityId.localeCompare(right.sourceEntityId);
+  }
+
+  if (left.trigger !== right.trigger) {
+    return left.trigger.localeCompare(right.trigger);
+  }
+
+  return left.id.localeCompare(right.id);
+}
+
+export function getInteractionLinks(
+  links: Record<string, InteractionLink>
+): InteractionLink[] {
+  return Object.values(links).sort(compareInteractionLinks);
+}
+
+export function getInteractionLinksForSource(
+  links: Record<string, InteractionLink>,
+  sourceEntityId: string
+): InteractionLink[] {
+  return getInteractionLinks(links).filter(
+    (link) => link.sourceEntityId === sourceEntityId
+  );
+}