diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 0344082..e379aea 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -80,12 +80,6 @@ jobs:
           node-version: 20
           cache: "npm"
 
-      - name: Install FlatBuffers compiler
-        run: |
-          curl -L https://github.com/google/flatbuffers/releases/download/v25.2.10/Linux.flatc.binary.clang++-18.zip -o flatc.zip
-          unzip flatc.zip -d /usr/local/bin/
-          chmod +x /usr/local/bin/flatc
-
       - name: Install dependencies
         run: npm ci
 
diff --git a/.gitignore b/.gitignore
index 0da9b78..79b4148 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,9 @@
 # Dependencies
 node_modules/
 
+# Local tooling (downloaded by scripts/ensure-flatc.sh)
+.bin/
+
 # Build output
 dist/
 
diff --git a/README.md b/README.md
index 73d7367..9230c11 100644
--- a/README.md
+++ b/README.md
@@ -45,6 +45,10 @@ npm run test
 npm run typecheck
 ```
 
+To regenerate FlatBuffers TypeScript after syncing schemas, run `npm run generate:fbs`.
+The pinned `flatc` compiler is downloaded automatically if not already available.
+The version is set in `scripts/ensure-flatc.sh`.
+
 ## API
 
 ### IcechunkStore
diff --git a/package.json b/package.json
index ba92d9d..a5ea00a 100644
--- a/package.json
+++ b/package.json
@@ -34,8 +34,8 @@
     "prepare": "test -d tests/data || ./scripts/sync-fixtures.sh && test -d flatbuffers || ./scripts/sync-flatbuffers.sh",
     "sync:fixtures": "./scripts/sync-fixtures.sh",
     "sync:fbs": "./scripts/sync-flatbuffers.sh",
-    "generate:fbs": "flatc -T -o ./src/format/flatbuffers --gen-all ./flatbuffers/all.fbs && node scripts/postgen-fbs.cjs ./src/format/flatbuffers && prettier --write src/format/flatbuffers/generated",
-    "check:fbs": "flatc -T -o /tmp/fbs-check --gen-all ./flatbuffers/all.fbs && node scripts/postgen-fbs.cjs /tmp/fbs-check && prettier --write /tmp/fbs-check/generated && diff -r /tmp/fbs-check/generated src/format/flatbuffers/generated"
+    "generate:fbs": "FLATC=\"$(./scripts/ensure-flatc.sh)\" && \"$FLATC\" -T -o ./src/format/flatbuffers --gen-all ./flatbuffers/all.fbs && node scripts/postgen-fbs.cjs ./src/format/flatbuffers && prettier --write src/format/flatbuffers/generated",
+    "check:fbs": "rm -rf /tmp/fbs-check && FLATC=\"$(./scripts/ensure-flatc.sh)\" && \"$FLATC\" -T -o /tmp/fbs-check --gen-all ./flatbuffers/all.fbs && node scripts/postgen-fbs.cjs /tmp/fbs-check && prettier --write /tmp/fbs-check/generated && diff -r /tmp/fbs-check/generated src/format/flatbuffers/generated"
   },
   "keywords": [
     "icechunk",
diff --git a/scripts/ensure-flatc.sh b/scripts/ensure-flatc.sh
new file mode 100755
index 0000000..f8503cd
--- /dev/null
+++ b/scripts/ensure-flatc.sh
@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+# Ensure the pinned flatc version is available at .bin/flatc.
+# Downloads it if missing or wrong version. Prints the path on stdout.
+#
+# Usage:
+#   FLATC="$(./scripts/ensure-flatc.sh)"
+#   "$FLATC" -T -o ./src/format/flatbuffers --gen-all ./flatbuffers/all.fbs
+
+set -euo pipefail
+
+FLATC_VERSION="25.12.19"
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
+BIN_DIR="$PROJECT_DIR/.bin"
+FLATC="$BIN_DIR/flatc"
+
+# Check if we already have the right version
+if [ -x "$FLATC" ]; then
+  current=$("$FLATC" --version 2>/dev/null | grep -oE '[0-9]+\.[0-9]+\.[0-9]+' || echo "")
+  if [ "$current" = "$FLATC_VERSION" ]; then
+    echo "$FLATC"
+    exit 0
+  fi
+  echo "flatc in .bin/ is v$current, need v$FLATC_VERSION" >&2
+fi
+
+# Download
+case "$(uname -s)" in
+  Linux)  ASSET="Linux.flatc.binary.clang++-18.zip" ;;
+  Darwin) ASSET="Mac.flatc.binary.zip" ;;
+  *)
+    echo "error: cannot download flatc for $(uname -s)" >&2
+    echo "Install flatc v$FLATC_VERSION to .bin/flatc manually." >&2
+    exit 1
+    ;;
+esac
+
+mkdir -p "$BIN_DIR"
+
+URL="https://github.com/google/flatbuffers/releases/download/v${FLATC_VERSION}/${ASSET}"
+TMPDIR=$(mktemp -d)
+trap 'rm -rf "$TMPDIR"' EXIT
+
+echo "Downloading flatc v${FLATC_VERSION}..." >&2
+curl -fsSL "$URL" -o "$TMPDIR/flatc.zip"
+unzip -o -q "$TMPDIR/flatc.zip" -d "$BIN_DIR/"
+chmod +x "$FLATC"
+
+echo "$FLATC"
diff --git a/src/format/flatbuffers/generated/move-operation.ts b/src/format/flatbuffers/generated/move-operation.ts
index 4506a20..e2a6b30 100644
--- a/src/format/flatbuffers/generated/move-operation.ts
+++ b/src/format/flatbuffers/generated/move-operation.ts
@@ -2,6 +2,9 @@
 
 import * as flatbuffers from "flatbuffers";
 
+import { NodeType } from "../generated/node-type.js";
+import { ObjectId8 } from "../generated/object-id8.js";
+
 export class MoveOperation {
   bb: flatbuffers.ByteBuffer | null = null;
   bb_pos = 0;
@@ -38,4 +41,16 @@ export class MoveOperation {
       ? this.bb!.__string(this.bb_pos + offset, optionalEncoding)
       : null;
   }
+
+  nodeId(obj?: ObjectId8): ObjectId8 | null {
+    const offset = this.bb!.__offset(this.bb_pos, 8);
+    return offset
+      ? (obj || new ObjectId8()).__init(this.bb_pos + offset, this.bb!)
+      : null;
+  }
+
+  nodeType(): NodeType {
+    const offset = this.bb!.__offset(this.bb_pos, 10);
+    return offset ? this.bb!.readUint8(this.bb_pos + offset) : NodeType.Group;
+  }
 }
diff --git a/src/format/flatbuffers/generated/node-type.ts b/src/format/flatbuffers/generated/node-type.ts
new file mode 100644
index 0000000..43122d2
--- /dev/null
+++ b/src/format/flatbuffers/generated/node-type.ts
@@ -0,0 +1,6 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+export enum NodeType {
+  Group = 0,
+  Array = 1,
+}