fix(sandbox): use invoked app name in help examples

[erulkey]

Problem

The CLI can run under two names: standalone sandbox, or embedded in the Vercel CLI as vercel sandbox (the embedding passes appName: 'vercel sandbox' to createApp). The usage line respects that name, but the top-level help examples are hardcoded to the standalone form. So vercel sandbox --help prints:

EXAMPLES:

  Create a sandbox and start a shell
  $ sandbox sh

For Vercel CLI users there is no sandbox binary on PATH, so copy-pasting the CLI's own examples fails with zsh: command not found: sandbox. Hit this today on a fresh first run (Vercel CLI 56.2.0).

Fix

Build the example commands from the same appName the usage line already uses. Standalone output is unchanged.

Verified against the built package:

• createApp({ appName: "vercel sandbox" }) help now shows $ vercel sandbox sh etc.
• createApp({ appName: "sandbox" }) output is identical to before.

Not covered here

Subcommand-level examples (create.ts, fork.ts) and runtime hints (format-error.ts, snapshot.ts, args/sandbox-name.ts, logout.ts, cp.ts) also hardcode sandbox .... Those strings are built at module import time, before createApp receives the name, so fixing them needs a small refactor (shared accessor or command factories). Happy to follow up with that if you want it.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
sandbox	Ready	Preview, v0	Jul 29, 2026 10:58pm
sandbox-sdk-ai-example	Ready	Preview	Jul 29, 2026 10:58pm
workflow-code-runner	Ready	Preview	Jul 29, 2026 10:58pm