diff --git a/completions/sandlot.fish b/completions/sandlot.fish
index cfe0af9..f523db5 100644
--- a/completions/sandlot.fish
+++ b/completions/sandlot.fish
@@ -11,7 +11,7 @@ function __sandlot_sessions
 end
 
 # All top-level subcommands (used for __fish_seen_subcommand_from checks)
-set -l __sandlot_cmds new list open review shell close rm merge save diff show log dir cleanup vm
+set -l __sandlot_cmds new list open review shell close rm merge save diff show log dir cd init cleanup vm
 set -l __sandlot_vm_cmds create start shell status info stop destroy
 
 # Disable file completions
@@ -31,12 +31,14 @@ complete -c sandlot -n "not __fish_seen_subcommand_from $__sandlot_cmds" -a diff
 complete -c sandlot -n "not __fish_seen_subcommand_from $__sandlot_cmds" -a show -d 'Show prompt and diff for a branch'
 complete -c sandlot -n "not __fish_seen_subcommand_from $__sandlot_cmds" -a log -d 'Show commits not on main'
 complete -c sandlot -n "not __fish_seen_subcommand_from $__sandlot_cmds" -a dir -d 'Print the worktree path'
+complete -c sandlot -n "not __fish_seen_subcommand_from $__sandlot_cmds" -a cd -d 'Change to a branch worktree directory'
+complete -c sandlot -n "not __fish_seen_subcommand_from $__sandlot_cmds" -a init -d 'Print shell init script'
 complete -c sandlot -n "not __fish_seen_subcommand_from $__sandlot_cmds" -a cleanup -d 'Remove stale sessions'
 complete -c sandlot -n "not __fish_seen_subcommand_from $__sandlot_cmds" -a vm -d 'Manage the sandlot VM'
 
 # ── Session branch completions ───────────────────────────────────────
 
-for cmd in open review shell close rm merge save diff show log dir
+for cmd in open review shell close rm merge save diff show log dir cd
     complete -c sandlot -n "__fish_seen_subcommand_from $cmd; and not __fish_seen_subcommand_from vm" -a '(__sandlot_sessions)'
 end
 
@@ -71,5 +73,9 @@ complete -c sandlot -n "__fish_seen_subcommand_from vm; and not __fish_seen_subc
 
 # ── Global options ───────────────────────────────────────────────────
 
+# ── init shell completions ───────────────────────────────────────
+
+complete -c sandlot -n '__fish_seen_subcommand_from init' -a 'fish bash zsh' -d 'Shell type'
+
 complete -c sandlot -s h -l help -d 'Show help'
 complete -c sandlot -s V -l version -d 'Show version'
diff --git a/src/cli.ts b/src/cli.ts
index 9d74dfb..7dbfe99 100755
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -24,6 +24,8 @@ import { action as editAction } from "./commands/edit.ts"
 import { action as cleanupAction } from "./commands/cleanup.ts"
 import { register as registerVmCommands } from "./commands/vm.ts"
 import { action as completionsAction } from "./commands/completions.ts"
+import { action as initAction } from "./commands/init.ts"
+import { action as cdAction } from "./commands/cd.ts"
 
 const pkg = await Bun.file(new URL("../package.json", import.meta.url)).json()
 
@@ -172,6 +174,12 @@ program
   .description("Print the worktree path for a session")
   .action(dirAction)
 
+program
+  .command("cd")
+  .argument("<branch>", "branch name")
+  .description("Change to a branch's worktree directory")
+  .action(cdAction)
+
 // ── Admin ───────────────────────────────────────────────────────────
 
 program.commandsGroup("Admin Commands:")
@@ -208,6 +216,12 @@ program
   .description("Output fish shell completions")
   .action((opts: { install?: boolean }) => completionsAction(program, opts))
 
+program
+  .command("init")
+  .argument("<shell>", "shell type (fish, bash, zsh)")
+  .description("Print shell init script (eval in your shell config)")
+  .action((shell: string) => initAction(program, shell))
+
 // ── Default: `sandlot` → `sandlot list` ─────────────────────────────
 
 if (process.argv.length === 2) {
diff --git a/src/commands/cd.ts b/src/commands/cd.ts
new file mode 100644
index 0000000..d67d4f4
--- /dev/null
+++ b/src/commands/cd.ts
@@ -0,0 +1,7 @@
+import { die } from "../fmt.ts"
+
+export function action(): never {
+  die(
+    `"sandlot cd" requires shell integration.\n\nAdd one of these to your shell config:\n\n  Fish  (~/.config/fish/config.fish):\n    sandlot init fish | source\n\n  Bash  (~/.bashrc):\n    eval "$(sandlot init bash)"\n\n  Zsh   (~/.zshrc):\n    eval "$(sandlot init zsh)"`
+  )
+}
diff --git a/src/commands/completions.ts b/src/commands/completions.ts
index 39b2888..54a144f 100644
--- a/src/commands/completions.ts
+++ b/src/commands/completions.ts
@@ -1,22 +1,9 @@
 import type { Command, Option } from "commander"
 
-/** Generate fish completions dynamically from the Commander program tree. */
-export function action(program: Command, opts: { install?: boolean } = {}) {
-  if (opts.install) {
-    const dest = "~/.config/fish/completions/sandlot.fish"
-    const lines = [
-      "#!/bin/sh",
-      `mkdir -p ~/.config/fish/completions`,
-      `sandlot completions > ${dest}`,
-      `echo "Installed fish completions to ${dest}"`,
-    ]
-    process.stdout.write(lines.join("\n") + "\n")
-    return
-  }
-
+/** Generate fish completion lines from the Commander program tree. */
+export function generateFishCompletions(program: Command): string[] {
   const lines: string[] = [
     "# Fish completions for sandlot (auto-generated)",
-    "# Install: sandlot completions > ~/.config/fish/completions/sandlot.fish",
     "",
     "complete -c sandlot -f",
     "",
@@ -65,6 +52,26 @@ export function action(program: Command, opts: { install?: boolean } = {}) {
   }
 
   lines.push("")
+  return lines
+}
+
+/** Generate fish completions dynamically from the Commander program tree. */
+export function action(program: Command, opts: { install?: boolean } = {}) {
+  if (opts.install) {
+    const dest = "~/.config/fish/completions/sandlot.fish"
+    const lines = [
+      "#!/bin/sh",
+      `mkdir -p ~/.config/fish/completions`,
+      `sandlot completions > ${dest}`,
+      `echo "Installed fish completions to ${dest}"`,
+    ]
+    process.stdout.write(lines.join("\n") + "\n")
+    return
+  }
+
+  const lines = generateFishCompletions(program)
+  // Add install hint at the top
+  lines.splice(1, 0, "# Install: sandlot completions > ~/.config/fish/completions/sandlot.fish")
   process.stdout.write(lines.join("\n") + "\n")
 }
 
diff --git a/src/commands/init.ts b/src/commands/init.ts
new file mode 100644
index 0000000..bb04bda
--- /dev/null
+++ b/src/commands/init.ts
@@ -0,0 +1,88 @@
+import type { Command } from "commander"
+import { die } from "../fmt.ts"
+import { generateFishCompletions } from "./completions.ts"
+
+export function action(program: Command, shell: string) {
+  switch (shell) {
+    case "fish":
+      return emitFish(program)
+    case "bash":
+      return emitBash(program)
+    case "zsh":
+      return emitZsh(program)
+    default:
+      die(`Unsupported shell: ${shell}. Supported shells: fish, bash, zsh`)
+  }
+}
+
+function emitFish(program: Command) {
+  const lines: string[] = [
+    "function sandlot --wraps sandlot --description 'Sandlot CLI wrapper'",
+    "    if test (count $argv) -ge 1; and test \"$argv[1]\" = cd",
+    "        set -l dir (command sandlot dir $argv[2..])",
+    "        and cd $dir",
+    "    else",
+    "        command sandlot $argv",
+    "    end",
+    "end",
+    "",
+    ...generateFishCompletions(program),
+  ]
+  process.stdout.write(lines.join("\n") + "\n")
+}
+
+function emitBash(program: Command) {
+  const { subcommands, branchCommands } = collectCommands(program)
+  const lines: string[] = [
+    "sandlot() {",
+    '    if [ "$#" -ge 1 ] && [ "$1" = "cd" ]; then',
+    "        local dir",
+    '        dir="$(command sandlot dir "${@:2}")" && cd "$dir"',
+    "    else",
+    '        command sandlot "$@"',
+    "    fi",
+    "}",
+    "",
+    "_sandlot_completions() {",
+    '    local cur prev',
+    '    cur="${COMP_WORDS[COMP_CWORD]}"',
+    '    prev="${COMP_WORDS[COMP_CWORD-1]}"',
+    "",
+    "    if [ \"$COMP_CWORD\" -eq 1 ]; then",
+    `        COMPREPLY=( $(compgen -W "${subcommands.join(" ")}" -- "$cur") )`,
+    "        return",
+    "    fi",
+    "",
+    `    case "$prev" in`,
+    `        ${branchCommands.join("|")})`,
+    '            local branches',
+    '            branches="$(command sandlot list --json 2>/dev/null | grep -o \'"branch": *"[^"]*"\' | sed \'s/.*"\\([^"]*\\)"$/\\1/\')"',
+    '            COMPREPLY=( $(compgen -W "$branches" -- "$cur") )',
+    "            return",
+    "            ;;",
+    "    esac",
+    "}",
+    "complete -F _sandlot_completions sandlot",
+  ]
+  process.stdout.write(lines.join("\n") + "\n")
+}
+
+function emitZsh(program: Command) {
+  // Prepend bashcompinit setup, then emit the same bash script
+  process.stdout.write("autoload -Uz bashcompinit && bashcompinit\n")
+  emitBash(program)
+}
+
+function collectCommands(program: Command): { subcommands: string[]; branchCommands: string[] } {
+  const subcommands: string[] = []
+  const branchCommands: string[] = []
+
+  for (const cmd of program.commands) {
+    if ((cmd as any)._hidden) continue
+    subcommands.push(cmd.name())
+    const hasBranch = cmd.registeredArguments.some(a => a.name() === "branch")
+    if (hasBranch) branchCommands.push(cmd.name())
+  }
+
+  return { subcommands, branchCommands }
+}