diff --git a/.gitignore b/.gitignore
index 99bf1bbe..be4a82c5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,6 +28,7 @@ vendor/
 
 # Node package managers, for future web work
 node_modules/
+node_modules
 .pnpm-store/
 npm-debug.log*
 yarn-debug.log*
diff --git a/package.json b/package.json
index 886b6e71..7e364b60 100644
--- a/package.json
+++ b/package.json
@@ -23,8 +23,9 @@
     "deploy:desired-state:plan": "node scripts/run-bun.mjs scripts/deploy-desired-state-plan.mjs --pretty",
     "deploy:desired-state:check": "node scripts/run-bun.mjs scripts/deploy-desired-state-plan.mjs --check",
     "cli:client": "node scripts/run-bun.mjs tools/hwlab-cli/bin/hwlab-cli.ts client",
-    "web:check": "cd web/hwlab-cloud-web && bun run check",
-    "web:build": "(cd web/hwlab-cloud-web && bun run build)",
+    "worktree:deps": "node scripts/worktree-deps.mjs --web",
+    "web:check": "node scripts/worktree-deps.mjs --web && cd web/hwlab-cloud-web && bun run check",
+    "web:build": "node scripts/worktree-deps.mjs --web && cd web/hwlab-cloud-web && bun run build",
     "artifact-catalog:preview-blocked": "node scripts/refresh-artifact-catalog.mjs --target-ref HEAD --blocked --no-write",
     "lane:expand": "node scripts/hwlab-lane-expand.mjs",
     "gitops:render": "node scripts/run-bun.mjs scripts/gitops-render.mjs",
diff --git a/scripts/worktree-deps.mjs b/scripts/worktree-deps.mjs
new file mode 100644
index 00000000..f8ba072c
--- /dev/null
+++ b/scripts/worktree-deps.mjs
@@ -0,0 +1,172 @@
+#!/usr/bin/env node
+import { spawnSync } from "node:child_process";
+import fs from "node:fs";
+import path from "node:path";
+
+const webRelativePath = path.join("web", "hwlab-cloud-web");
+const sharedWebDepsName = "hwlab-cloud-web-deps";
+const requiredWebPackages = ["vite", "vue", "@vitejs/plugin-vue", "vue-tsc", "vitest"];
+const requiredWebBins = [path.join(".bin", "vite"), path.join(".bin", "vue-tsc")];
+const allowedArgs = new Set(["--web", "--json", "--quiet", "--help"]);
+
+const args = process.argv.slice(2);
+const argSet = new Set(args);
+
+try {
+  for (const arg of args) {
+    if (!allowedArgs.has(arg)) fail(`Unknown argument: ${arg}`);
+  }
+
+  if (argSet.has("--help")) {
+    process.stdout.write(`Usage: node scripts/worktree-deps.mjs [--web] [--json] [--quiet]\n\nPrepares shared, ignored dependencies for HWLAB git worktrees.\n`);
+    process.exit(0);
+  }
+
+  const repoRoot = findRepoRoot(process.cwd());
+  const result = ensureWebDeps(repoRoot);
+  writeResult(result);
+} catch (error) {
+  const message = error instanceof Error ? error.message : String(error);
+  if (argSet.has("--json")) process.stdout.write(`${JSON.stringify({ ok: false, error: message })}\n`);
+  else process.stderr.write(`hwlab worktree deps: ${message}\n`);
+  process.exit(1);
+}
+
+function ensureWebDeps(repoRoot) {
+  const webRoot = path.join(repoRoot, webRelativePath);
+  const packagePath = path.join(webRoot, "package.json");
+  const lockPath = path.join(webRoot, "bun.lock");
+  if (!fs.existsSync(packagePath)) fail(`Missing ${path.relative(repoRoot, packagePath)}`);
+  if (!fs.existsSync(lockPath)) fail(`Missing ${path.relative(repoRoot, lockPath)}`);
+
+  const fixedRoot = fixedRepoRoot(repoRoot);
+  const sharedRoot = path.join(fixedRoot, ".worktree", sharedWebDepsName);
+  const sharedNodeModules = path.join(sharedRoot, "node_modules");
+  const nodeModulesPath = path.join(webRoot, "node_modules");
+  const existing = tryLstat(nodeModulesPath);
+
+  if (hasRequiredWebDeps(nodeModulesPath)) {
+    return {
+      ok: true,
+      mode: existing?.isSymbolicLink() ? "shared-symlink" : "local-existing",
+      repoRoot,
+      fixedRoot,
+      webRoot,
+      sharedRoot,
+      nodeModulesPath,
+      installRan: false,
+      linked: existing?.isSymbolicLink() ?? false
+    };
+  }
+
+  if (existing && !existing.isSymbolicLink()) {
+    if (!existing.isDirectory()) fail(`${path.relative(repoRoot, nodeModulesPath)} exists but is not a directory or symlink`);
+    runBunInstall(webRoot);
+    if (!hasRequiredWebDeps(nodeModulesPath)) fail("Local web dependency install completed but required packages are still missing");
+    return {
+      ok: true,
+      mode: "local-install",
+      repoRoot,
+      fixedRoot,
+      webRoot,
+      sharedRoot,
+      nodeModulesPath,
+      installRan: true,
+      linked: false
+    };
+  }
+
+  const shared = ensureSharedWebDeps(webRoot, sharedRoot, sharedNodeModules);
+  linkNodeModules(nodeModulesPath, sharedNodeModules);
+  if (!hasRequiredWebDeps(nodeModulesPath)) fail("Shared web dependency link completed but required packages are still missing");
+
+  return {
+    ok: true,
+    mode: "shared-symlink",
+    repoRoot,
+    fixedRoot,
+    webRoot,
+    sharedRoot,
+    nodeModulesPath,
+    installRan: shared.installRan,
+    linked: true
+  };
+}
+
+function ensureSharedWebDeps(webRoot, sharedRoot, sharedNodeModules) {
+  fs.mkdirSync(sharedRoot, { recursive: true });
+  const packageChanged = copyIfDifferent(path.join(webRoot, "package.json"), path.join(sharedRoot, "package.json"));
+  const lockChanged = copyIfDifferent(path.join(webRoot, "bun.lock"), path.join(sharedRoot, "bun.lock"));
+  const needsInstall = packageChanged || lockChanged || !hasRequiredWebDeps(sharedNodeModules);
+  if (needsInstall) runBunInstall(sharedRoot);
+  if (!hasRequiredWebDeps(sharedNodeModules)) fail(`Shared dependency install is incomplete at ${sharedNodeModules}`);
+  return { installRan: needsInstall };
+}
+
+function linkNodeModules(nodeModulesPath, sharedNodeModules) {
+  const existing = tryLstat(nodeModulesPath);
+  if (existing?.isSymbolicLink()) fs.unlinkSync(nodeModulesPath);
+  else if (existing) fail(`${nodeModulesPath} already exists and is not a symlink`);
+  const relativeTarget = path.relative(path.dirname(nodeModulesPath), sharedNodeModules) || sharedNodeModules;
+  fs.symlinkSync(relativeTarget, nodeModulesPath, "dir");
+}
+
+function runBunInstall(cwd) {
+  const result = spawnSync("bun", ["install", "--frozen-lockfile"], { cwd, encoding: "utf8", stdio: ["ignore", "inherit", "inherit"] });
+  if (result.status !== 0) fail(`bun install --frozen-lockfile failed in ${cwd} with exit ${result.status ?? "unknown"}`);
+}
+
+function hasRequiredWebDeps(nodeModulesPath) {
+  return requiredWebPackages.every((name) => fs.existsSync(path.join(nodeModulesPath, name))) && requiredWebBins.every((name) => fs.existsSync(path.join(nodeModulesPath, name)));
+}
+
+function copyIfDifferent(source, target) {
+  if (fs.existsSync(target) && fs.readFileSync(source).equals(fs.readFileSync(target))) return false;
+  fs.mkdirSync(path.dirname(target), { recursive: true });
+  fs.copyFileSync(source, target);
+  return true;
+}
+
+function findRepoRoot(startDir) {
+  const gitResult = spawnSync("git", ["rev-parse", "--show-toplevel"], { cwd: startDir, encoding: "utf8", stdio: ["ignore", "pipe", "ignore"] });
+  if (gitResult.status === 0 && gitResult.stdout.trim()) return path.resolve(gitResult.stdout.trim());
+
+  let current = path.resolve(startDir);
+  while (true) {
+    if (fs.existsSync(path.join(current, "package.json")) && fs.existsSync(path.join(current, webRelativePath, "package.json"))) return current;
+    const parent = path.dirname(current);
+    if (parent === current) break;
+    current = parent;
+  }
+  fail(`Unable to find HWLAB repo root from ${startDir}`);
+}
+
+function fixedRepoRoot(repoRoot) {
+  const marker = `${path.sep}.worktree${path.sep}`;
+  const index = repoRoot.indexOf(marker);
+  return index >= 0 ? repoRoot.slice(0, index) : repoRoot;
+}
+
+function tryLstat(filePath) {
+  try {
+    return fs.lstatSync(filePath);
+  } catch (error) {
+    if (error && typeof error === "object" && "code" in error && error.code === "ENOENT") return null;
+    throw error;
+  }
+}
+
+function writeResult(result) {
+  if (argSet.has("--json")) {
+    process.stdout.write(`${JSON.stringify(result)}\n`);
+    return;
+  }
+  if (argSet.has("--quiet")) return;
+  const install = result.installRan ? "install=ran" : "install=skipped";
+  const link = result.linked ? `node_modules -> ${path.relative(result.webRoot, path.join(result.sharedRoot, "node_modules"))}` : "node_modules=local";
+  process.stdout.write(`hwlab worktree deps: web ready (${result.mode}, ${install}, ${link})\n`);
+}
+
+function fail(message) {
+  throw new Error(message);
+}
diff --git a/web/hwlab-cloud-web/scripts/dist-contract.ts b/web/hwlab-cloud-web/scripts/dist-contract.ts
index 234908c5..846e430a 100644
--- a/web/hwlab-cloud-web/scripts/dist-contract.ts
+++ b/web/hwlab-cloud-web/scripts/dist-contract.ts
@@ -167,11 +167,26 @@ function ensureWebDeps(rootDir: string): void {
   const lockPath = path.join(rootDir, "bun.lock");
   const nodeModulesPath = path.join(rootDir, "node_modules");
   if (!fs.existsSync(lockPath)) return;
-  if (fs.existsSync(path.join(nodeModulesPath, "vite")) && fs.existsSync(path.join(nodeModulesPath, "vue")) && fs.existsSync(path.join(nodeModulesPath, "@vitejs/plugin-vue"))) return;
+  if (hasRequiredWebDeps(nodeModulesPath)) return;
+
+  const repoRoot = path.resolve(rootDir, "..", "..");
+  const worktreeDepsHelper = path.join(repoRoot, "scripts", "worktree-deps.mjs");
+  if (fs.existsSync(worktreeDepsHelper)) {
+    const helperResult = spawnSync("node", [worktreeDepsHelper, "--web", "--quiet"], { cwd: repoRoot, encoding: "utf8", stdio: ["ignore", "inherit", "inherit"] });
+    if (helperResult.status !== 0) throw new Error(`worktree web dependency setup exited with code ${helperResult.status ?? "unknown"}`);
+    if (hasRequiredWebDeps(nodeModulesPath)) return;
+    throw new Error("worktree web dependency setup completed but required packages are still missing");
+  }
+
   const result = spawnSync("bun", ["install", "--frozen-lockfile"], { cwd: rootDir, encoding: "utf8", stdio: ["ignore", "inherit", "inherit"] });
   if (result.status !== 0) throw new Error(`bun install exited with code ${result.status ?? "unknown"}`);
 }
 
+function hasRequiredWebDeps(nodeModulesPath: string): boolean {
+  return ["vite", "vue", "@vitejs/plugin-vue", "vue-tsc", "vitest"].every((name) => fs.existsSync(path.join(nodeModulesPath, name))) &&
+    [path.join(".bin", "vite"), path.join(".bin", "vue-tsc")].every((name) => fs.existsSync(path.join(nodeModulesPath, name)));
+}
+
 if (process.argv[1] && path.resolve(process.argv[1]) === fileURLToPath(import.meta.url)) {
   const args = process.argv.slice(2);
   const rootIndex = args.indexOf("--root");