diff --git a/src/npx-cli/commands/runtime.ts b/src/npx-cli/commands/runtime.ts
index 3e376026..a0781b63 100644
--- a/src/npx-cli/commands/runtime.ts
+++ b/src/npx-cli/commands/runtime.ts
@@ -101,6 +101,44 @@ export function runStatusCommand(): void {
   spawnBunWorkerCommand('status');
 }
 
+/**
+ * Stamp merged-worktree provenance on observations/summaries and keep Chroma
+ * metadata in lockstep. Delegates to the worker-service.cjs `adopt` subcommand
+ * so adoption runs in Bun (needed for bun:sqlite) while preserving the user's
+ * working directory — that's what the engine uses to locate the parent repo.
+ */
+export function runAdoptCommand(extraArgs: string[] = []): void {
+  ensureInstalledOrExit();
+  const bunPath = resolveBunOrExit();
+  const workerScript = workerServiceScriptPath();
+
+  if (!existsSync(workerScript)) {
+    console.error(pc.red(`Worker script not found at: ${workerScript}`));
+    console.error('The installation may be corrupted. Try: npx claude-mem install');
+    process.exit(1);
+  }
+
+  // Pass user's cwd explicitly via --cwd because we override cwd on spawn to
+  // marketplaceDirectory() (required for the worker's own file resolution).
+  const userCwd = process.cwd();
+  const args = [workerScript, 'adopt', '--cwd', userCwd, ...extraArgs];
+
+  const child = spawn(bunPath, args, {
+    stdio: 'inherit',
+    cwd: marketplaceDirectory(),
+    env: process.env,
+  });
+
+  child.on('error', (error) => {
+    console.error(pc.red(`Failed to start Bun: ${error.message}`));
+    process.exit(1);
+  });
+
+  child.on('close', (exitCode) => {
+    process.exit(exitCode ?? 0);
+  });
+}
+
 /**
  * Search the worker API at `GET /api/search?query=<query>`.
  */
diff --git a/src/npx-cli/index.ts b/src/npx-cli/index.ts
index a3f47379..a706eb7b 100644
--- a/src/npx-cli/index.ts
+++ b/src/npx-cli/index.ts
@@ -52,6 +52,7 @@ ${pc.bold('Runtime Commands')} (requires Bun, delegates to installed plugin):
   ${pc.cyan('npx claude-mem restart')}              Restart worker service
   ${pc.cyan('npx claude-mem status')}               Show worker status
   ${pc.cyan('npx claude-mem search <query>')}       Search observations
+  ${pc.cyan('npx claude-mem adopt [--dry-run]')}    Stamp merged worktrees into parent project
   ${pc.cyan('npx claude-mem transcript watch')}     Start transcript watcher
 
 ${pc.bold('IDE Identifiers')}:
@@ -145,6 +146,13 @@ async function main(): Promise<void> {
       break;
     }
 
+    // -- Adopt merged worktrees -------------------------------------------
+    case 'adopt': {
+      const { runAdoptCommand } = await import('./commands/runtime.js');
+      runAdoptCommand(args.slice(1));
+      break;
+    }
+
     // -- Transcript --------------------------------------------------------
     case 'transcript': {
       const subCommand = args[1]?.toLowerCase();
diff --git a/src/services/worker-service.ts b/src/services/worker-service.ts
index e723d8a6..bf362b92 100644
--- a/src/services/worker-service.ts
+++ b/src/services/worker-service.ts
@@ -1208,6 +1208,36 @@ async function main() {
       break;
     }
 
+    case 'adopt': {
+      const dryRun = process.argv.includes('--dry-run');
+      const branchIndex = process.argv.indexOf('--branch');
+      const onlyBranch = branchIndex !== -1 ? process.argv[branchIndex + 1] : undefined;
+      // Honor an explicit --cwd override so the NPX CLI can pass through the
+      // user's working directory (the spawn sets cwd to the marketplace dir).
+      const cwdIndex = process.argv.indexOf('--cwd');
+      const repoPath = cwdIndex !== -1 ? process.argv[cwdIndex + 1] : process.cwd();
+
+      const result = await adoptMergedWorktrees({ repoPath, dryRun, onlyBranch });
+
+      const tag = result.dryRun ? '(dry-run)' : '(applied)';
+      console.log(`\nWorktree adoption ${tag}`);
+      console.log(`  Parent project:       ${result.parentProject || '(unknown)'}`);
+      console.log(`  Repo:                 ${result.repoPath}`);
+      console.log(`  Worktrees scanned:    ${result.scannedWorktrees}`);
+      console.log(`  Merged branches:      ${result.mergedBranches.join(', ') || '(none)'}`);
+      console.log(`  Observations adopted: ${result.adoptedObservations}`);
+      console.log(`  Summaries adopted:    ${result.adoptedSummaries}`);
+      console.log(`  Chroma docs updated:  ${result.chromaUpdates}`);
+      if (result.chromaFailed > 0) {
+        console.log(`  Chroma sync failures: ${result.chromaFailed} (will retry on next run)`);
+      }
+      for (const err of result.errors) {
+        console.log(`  ! ${err.worktree}: ${err.error}`);
+      }
+      process.exit(0);
+      break;
+    }
+
     case '--daemon':
     default: {
       // GUARD 1: Refuse to start if another worker is already alive (PID check).