diff --git a/src/cli.ts b/src/cli.ts
index 5fc02a0..71bc18a 100755
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -382,11 +382,16 @@ program
 
 // ── sandlot close <branch> ───────────────────────────────────────────
 
-const closeAction = async (branch: string) => {
+const closeAction = async (branch: string, opts: { force?: boolean } = {}) => {
   const root = await git.repoRoot()
   const session = await state.getSession(root, branch)
   const worktreeAbs = session?.worktree ?? join(homedir(), '.sandlot', basename(root), branch)
 
+  if (!opts.force && session && await git.isDirty(worktreeAbs)) {
+    console.error(`✖ Branch "${branch}" has unsaved changes. Run "sandlot save ${branch}" first, or use -f to force.`)
+    process.exit(1)
+  }
+
   await vm.clearActivity(worktreeAbs, branch)
 
   await git.removeWorktree(worktreeAbs, root)
@@ -471,13 +476,15 @@ program
 program
   .command("close")
   .argument("<branch>", "branch name")
+  .option("-f, --force", "close even if there are unsaved changes")
   .description("Remove a worktree and clean up the session")
-  .action(closeAction)
+  .action((branch: string, opts: { force?: boolean }) => closeAction(branch, opts))
 
 program
   .command("rm", { hidden: true })
   .argument("<branch>", "branch name")
-  .action(closeAction)
+  .option("-f, --force", "close even if there are unsaved changes")
+  .action((branch: string, opts: { force?: boolean }) => closeAction(branch, opts))
 
 // ── sandlot save <branch> ───────────────────────────────────────────