diff --git a/package.json b/package.json
index 615ef24..e8ab6f4 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "version": "0.1.2",
   "description": "TypeScript editor + .flowgo helpers for the flowgo mind-map tool. Built as a single self-contained index.html by the public flowgo binary; also consumable as ESM modules by downstream projects.",
   "type": "module",
-  "packageManager": "pnpm@10.33.2",
+  "packageManager": "pnpm@10.34.0+sha512.8736169c56fdb6e26afb5d7e2bd5f4c99cc299620d8bdc288cb354e6dd0936bd4ea62276d1a6b2de4b6e971a00a530e0e08bbeeda63da5d820118d3d7e21ff69",
   "license": "AGPL-3.0",
   "repository": {
     "type": "git",
@@ -18,7 +18,8 @@
   "exports": {
     ".": "./src/index.ts",
     "./editor": "./src/editor/main.ts",
-    "./editor/*": "./src/editor/*"
+    "./editor/*": "./src/editor/*",
+    "./collab": "./src/editor/collab-api.ts"
   },
   "scripts": {
     "dev": "vite",
diff --git a/pkg/flowgo/dist/index.html b/pkg/flowgo/dist/index.html
index 0cede78..bef9f7e 100644
--- a/pkg/flowgo/dist/index.html
+++ b/pkg/flowgo/dist/index.html
@@ -588,8 +588,8 @@
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 <body>
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diff --git a/src/editor/collab-api.ts b/src/editor/collab-api.ts
new file mode 100644
index 0000000..543345c
--- /dev/null
+++ b/src/editor/collab-api.ts
@@ -0,0 +1,141 @@
+// Collaboration extension point.
+//
+// Downstream consumers (e.g. a Yjs collab plugin in a cloud product)
+// import `whenCollabReady` from "@flowgo/editor/collab" and pass a
+// callback that receives a typed `CollabHandle`. The handle exposes
+// the minimum surface needed to mirror the editor's in-memory graph
+// into an external store:
+//
+//   1. snapshot()          — read the current graph as a plain object.
+//   2. applyRemotePatch(fn) — mutate the live graph + trigger a render
+//                            without losing focus or selection.
+//   3. onLocalMutation(cb)  — subscribe to local mutation events so the
+//                            plugin can diff and push to its own store.
+//
+// This module ships in every editor bundle but has zero runtime cost
+// until something calls whenCollabReady — no Yjs dep, no subscription
+// list traversal, no behaviour change for single-user / CLI users.
+//
+// Bootstrap order:
+//
+//   The editor's main.ts calls `exposeCollabHandle(...)` at the end
+//   of its bootstrap, AFTER every wireX() registration has run. A
+//   plugin that loaded earlier (its whenCollabReady callback queued)
+//   gets invoked at that moment; a plugin that loads later sees the
+//   handle immediately.
+//
+// All types here mirror the on-disk pkg/graph.Graph shape verbatim
+// so the cloud plugin can pass snapshots to a Rust/Go sidecar via
+// JSON without translation.
+
+import type { MutationEvent } from "./mutations.ts";
+
+// ---------------------------------------------------------------
+// Graph shape (mirror of pkg/graph.Graph).
+// ---------------------------------------------------------------
+
+export interface FlowgoBox {
+  id: string;
+  label: string;
+  x: number;
+  y: number;
+  palette?: number;
+  font?: number;
+  anchor?: boolean;
+}
+
+export interface FlowgoEdge {
+  from: string;
+  fromHandle?: string;
+  to: string;
+  toHandle?: string;
+  palette?: number;
+}
+
+export interface FlowgoText {
+  id: string;
+  label: string;
+  x: number;
+  y: number;
+  palette?: number;
+  font?: number;
+}
+
+export interface FlowgoLine {
+  id: string;
+  x1: number;
+  y1: number;
+  x2: number;
+  y2: number;
+  palette?: number;
+  style?: number;
+  mids?: number[][];
+}
+
+export interface FlowgoStroke {
+  id: string;
+  points: number[][];
+  palette?: number;
+}
+
+export interface FlowgoMap {
+  path: string;
+  boxes: FlowgoBox[];
+  edges: FlowgoEdge[];
+  texts?: FlowgoText[];
+  lines?: FlowgoLine[];
+  strokes?: FlowgoStroke[];
+}
+
+export interface FlowgoGraph {
+  version?: string;
+  maps: FlowgoMap[];
+}
+
+// ---------------------------------------------------------------
+// Plugin handle.
+// ---------------------------------------------------------------
+
+export interface CollabHandle {
+  /** Read-only snapshot of the current in-memory graph. The returned
+   *  object is a structured clone — mutating it does NOT mutate the
+   *  editor. Use applyRemotePatch() to write. */
+  snapshot(): FlowgoGraph;
+
+  /** Mutate the live graph and trigger a re-render. The callback
+   *  receives a mutable reference to the graph; mutations propagate
+   *  to the next render frame. Selection and focus are preserved. */
+  applyRemotePatch(fn: (g: FlowgoGraph) => void): void;
+
+  /** Subscribe to local mutation events. Returns an unsubscribe
+   *  function. The plugin is expected to diff its own store against
+   *  snapshot() inside the callback and forward deltas. */
+  onLocalMutation(cb: (e: MutationEvent) => void): () => void;
+}
+
+// ---------------------------------------------------------------
+// Bootstrap-order plumbing.
+// ---------------------------------------------------------------
+
+let handle: CollabHandle | null = null;
+const awaiting: Array<(h: CollabHandle) => void> = [];
+
+/** Plugin entry point: register a callback that fires as soon as the
+ *  editor is ready to be wired. Safe to call before OR after the
+ *  editor's main.ts has run. */
+export const whenCollabReady = (cb: (h: CollabHandle) => void): void => {
+  if (handle) {
+    cb(handle);
+    return;
+  }
+  awaiting.push(cb);
+};
+
+/** Editor entry point: install the handle. Called once by main.ts at
+ *  the end of bootstrap. Calling twice replaces the handle (last one
+ *  wins) and re-fires any waiting plugins against the new handle. */
+export const exposeCollabHandle = (h: CollabHandle): void => {
+  handle = h;
+  const pending = awaiting.splice(0);
+  for (const cb of pending) cb(h);
+};
diff --git a/src/editor/main.ts b/src/editor/main.ts
index 110d0f6..330d55a 100644
--- a/src/editor/main.ts
+++ b/src/editor/main.ts
@@ -42,6 +42,7 @@ import {
   wirePersistence,
 } from "./persistence.ts";
 import { mutatedCurrentMap, wireMutations } from "./mutations.ts";
+import { exposeCollabHandle } from "./collab-api.ts";
 import {
   cloneSelection as cloneSelectionPure,
   wireClone,
@@ -236,8 +237,16 @@ wirePersistence({
 
 // Every mutation funnels through mutations.ts. The default wiring
 // just calls scheduleSave; downstream consumers can swap it without
-// touching the 26 call sites.
-wireMutations({ scheduleSave: () => scheduleSave() });
+// touching the 26 call sites. onMutate fans events out to any
+// collab plugin that called whenCollabReady (see collab-api.ts).
+const onLocalMutationCallbacks = [];
+wireMutations({
+  scheduleSave: () => scheduleSave(),
+  getMapPath: () => currentPath,
+  onMutate: (e) => {
+    for (const cb of onLocalMutationCallbacks) cb(e);
+  },
+});
 
 wireClone({
   currentMap: () => state,
@@ -391,3 +400,25 @@ fetch("/version")
   })
   .catch(() => { /* version stamp is best-effort */ });
 
+// Expose the collab extension point. Plugins import whenCollabReady
+// from "@flowgo/editor/collab"; nothing in the CLI / single-user
+// bundle imports it so this is a no-op there.
+exposeCollabHandle({
+  snapshot: () => structuredClone(graph),
+  applyRemotePatch: (fn) => {
+    fn(graph);
+    // The graph mutation may have changed the current map's contents
+    // (or even removed it). Refresh the local `state` alias so the
+    // next render reads the right slice.
+    state = ensureMap(currentPath);
+    renderAll();
+  },
+  onLocalMutation: (cb) => {
+    onLocalMutationCallbacks.push(cb);
+    return () => {
+      const i = onLocalMutationCallbacks.indexOf(cb);
+      if (i >= 0) onLocalMutationCallbacks.splice(i, 1);
+    };
+  },
+});
+
diff --git a/src/editor/mutations.ts b/src/editor/mutations.ts
index 70e35e8..035fdd5 100644
--- a/src/editor/mutations.ts
+++ b/src/editor/mutations.ts
@@ -2,13 +2,38 @@
 // mutation seam in the editor calls one of the typed mutator
 // functions below instead of scheduleSave() directly.
 //
-// Today every mutator funnels into the wired scheduleSave —
-// behaviour is identical to calling scheduleSave() at the call site.
-// The typed surface exists so that downstream wiring can hook on
-// the right kind of change without a 30-site audit later.
+// Two hooks fan out from each mutator:
+//
+//   scheduleSave  — required. Today this funnels into the editor's
+//                   own debounced save path so file persistence (CLI
+//                   mode) or in-memory session save (serve mode)
+//                   happens automatically.
+//   onMutate      — optional. Fires alongside scheduleSave with a
+//                   typed event so a downstream binding (e.g. a Yjs
+//                   collab plugin) can scope its diff to the right
+//                   kind of change without a 30-site audit.
+
+export type MutationKind =
+  | "box"
+  | "edge"
+  | "text"
+  | "line"
+  | "stroke"
+  | "currentMap"
+  | "doc";
+
+export interface MutationEvent {
+  readonly kind: MutationKind;
+  readonly mapPath: string;
+}
 
 interface MutationBindings {
   readonly scheduleSave: () => void;
+  /** Optional. Returns the editor's currently-focused map path
+   *  (e.g. "/", "/b1", "/b1/c2"). Defaults to "/" if not provided. */
+  readonly getMapPath?: () => string;
+  /** Optional. Called after scheduleSave for every mutation. */
+  readonly onMutate?: (e: MutationEvent) => void;
 }
 
 let bindings: MutationBindings | null = null;
@@ -17,25 +42,29 @@ export const wireMutations = (b: MutationBindings): void => {
   bindings = b;
 };
 
-const fire = (): void => {
+const fire = (kind: MutationKind): void => {
   if (!bindings) throw new Error("mutations: wireMutations() not called");
   bindings.scheduleSave();
+  if (bindings.onMutate) {
+    const mapPath = bindings.getMapPath ? bindings.getMapPath() : "/";
+    bindings.onMutate({ kind, mapPath });
+  }
 };
 
 // One function per kind on the current map. The function shapes
 // reserve room for downstream wiring that wants to scope a diff to
-// a specific entity; today they all just fire scheduleSave.
+// a specific entity; today they all just fire scheduleSave + onMutate.
 
-export const mutatedBox = (): void => fire();
-export const mutatedEdge = (): void => fire();
-export const mutatedText = (): void => fire();
-export const mutatedLine = (): void => fire();
-export const mutatedStroke = (): void => fire();
+export const mutatedBox = (): void => fire("box");
+export const mutatedEdge = (): void => fire("edge");
+export const mutatedText = (): void => fire("text");
+export const mutatedLine = (): void => fire("line");
+export const mutatedStroke = (): void => fire("stroke");
 
 // The current map changed in a way that spans multiple kinds or
 // touches the whole map (paste, align, multi-select palette change).
-export const mutatedCurrentMap = (): void => fire();
+export const mutatedCurrentMap = (): void => fire("currentMap");
 
 // The document structure changed (maps added/removed via box
 // deletion, or anything that affects more than one map at once).
-export const mutatedDoc = (): void => fire();
+export const mutatedDoc = (): void => fire("doc");