Securing Your Vibe Coding Setup With a Local Vault

What vibe coding changes about your risk

Vibe coding is Andrej Karpathy's term, from February 2025, for a style of building software where you describe what you want in plain language and let an AI model write and run the code, mostly without reading every line it produces. Karpathy's own description was to "fully give in to the vibes, embrace exponentials, and forget that the code even exists." It is a real shift in how people work, not a buzzword for ordinary AI-assisted coding, because the whole point is to stop reviewing closely.

That is exactly what makes secrets different in this workflow. A developer reviewing every diff would probably notice a credential pasted into a debug print or a .env file staged for commit. Someone vibe coding, by design, is not looking at every diff. An agent that opens a .env file to understand how a service is configured, prints an environment variable while debugging a failure, or stages a credentials file along with everything else it touched will not raise a flag, because nothing about that looks unusual to a workflow that has already decided not to scrutinize the small stuff.

The fix is not to review more, since that defeats what vibe coding is for. The fix is to make sure there is nothing sensitive left for an unreviewed diff, a printed environment, or a wide commit to expose in the first place.

• Vibe coding means trusting an agent's output without reading most of it.
• That trust is fine for code. It is a liability for secrets sitting in the same folder.
• A key does not need malice to leak. It only needs to be in a place a fast workflow will eventually touch.

Local vault versus cloud secrets manager

A local vault keeps the encrypted data on your own device, and reading it does not require a live connection to anyone else's server. A cloud secrets manager, the kind covered in depth elsewhere on this site, needs a connection to a party that can see, at minimum, when a secret was requested and how often.

For one person's vibe coding setup, local is usually simpler and removes a party that could be breached or subpoenaed or simply go down while you are trying to ship. For a team, the calculation shifts, because a local vault on one laptop does not help the next developer, and losing the laptop means losing the vault. The honest answer is that both models are legitimate; which one fits depends on whether you are protecting one machine or coordinating several.

• Local: the encrypted file or OS store lives on your device; no network call is required to read it.
• Cloud: convenient across machines and teams, but adds a party in the loop.
• A lost laptop with a local-only vault means a lost vault, so back up the file or the recovery key.

Four local-first options, compared honestly

The macOS Keychain is already on every Mac. Items stay on the device unless you turn on iCloud Keychain sync, and you can read a stored value from the command line with the security tool or hand it to a script without writing it to disk.

KeePassXC is a free, open source password manager, released under the GPLv3 license, that stores everything in one encrypted .kdbx file you control the location of. It has no cloud component at all unless you choose to put that file in cloud storage yourself, and its 2.7.9 release earned a first-level security certification from ANSSI, the French national cybersecurity agency.

1Password is not purely local, and it is worth being clear about that. Its CLI tool supports a command called op run, which loads secrets and starts your command in a subprocess with those secrets available only as environment variables for the life of that process, using references like op://vault/item/field instead of pasting real values anywhere. That injection step is genuinely local. The vault itself, though, is synced through 1Password's own servers by default, so you are trusting a vendor's cloud as well as the CLI.

For a team that wants the Bitwarden experience without Bitwarden's cloud, Vaultwarden is an open source, Rust-based server that implements the Bitwarden client API and works with the official Bitwarden apps. It is not affiliated with Bitwarden the company, but it lets you run the whole thing, data included, on a server you control.

• macOS Keychain: built in, local by default, free.
• KeePassXC: open source, offline, one file you own, ANSSI-certified in its 2.7.9 release.
• 1Password CLI: local secret injection, but the vault syncs through 1Password's cloud.
• Vaultwarden: self-hosted, open source, speaks the Bitwarden client protocol.

Wiring a vault into your vibe-coding loop

Start by finding what is already exposed. Search the project and your home folder for .env files, anything named credentials, and tokens pasted into a shell profile. Move each real secret into your chosen vault, then delete the plaintext copy and rotate the key, because a value an agent could already have read should be treated as potentially seen.

Add the secret file names to .gitignore so an agent that stages files broadly cannot commit them by accident. Then change how the command gets the value: instead of a script reading a .env file, run it through something like op run, pull it from the macOS Keychain with the security tool, or use a small wrapper that calls into KeePassXC or Vaultwarden's CLI and sets the environment variable for one process only.

Finally, watch what the agent prints. A debugging step that dumps the environment to the terminal defeats all of this, because the scrollback becomes a second, unencrypted copy of the secret.

• Find every plaintext secret already on disk before adding a vault.
• Rotate anything that was ever in a readable file, whether or not you think it was read.
• Inject secrets into the one process that needs them, not into the shell's general environment.
• Never let the agent print the environment to debug something.

Doing this across a team, not just one machine

Enterprise adoption of vibe coding usually arrives faster than the security conversation about it, which is backwards. The practical model most teams land on is two layers: each developer keeps personal credentials in their own local vault, tied to their own login, and the team runs one shared vault, self-hosted with something like Vaultwarden, for credentials that genuinely need to be shared.

That split matters for offboarding. When someone leaves, you revoke the few credentials that lived in the shared vault and you are done; you are not hunting through chat transcripts and old commits hoping you found every place a personal key leaked. It also matters for blast radius during a vibe-coding session specifically: keep production credentials out of any session where an agent is experimenting, and give it a narrower key scoped to a staging environment instead.

• Personal keys in a personal local vault; shared keys in a self-hosted team vault.
• Offboarding should mean revoking a short list, not an investigation.
• Production credentials do not belong in an experimental vibe-coding session.

Where Forkbench's Vault fits

Forkbench is a Mac desktop app built around exactly this: coding agents run in real terminals on your own machine. Its Vault stores secrets in the macOS Keychain and lets a command use one by name, so the value can be applied when a process starts without appearing in the prompt, the command line, or the saved transcript of the session.

That is a specific, narrow promise, not a general one. An unpinned Vault key can still be read by the program it was handed to, since the point of injecting it is to let that program use it. Forkbench governs the secrets you put in its Vault and the folders you choose to lock a Thread to; it does not change what an agent can read in a project folder you have not locked down.

• Secrets sit in the macOS Keychain, not in a file an agent can open.
• A command uses a secret by name; the value is not shown in the prompt or transcript.
• An unpinned key is still usable by whatever program it was given to.

A checklist for this week

You can do most of this without adopting any new tool, and the parts that need a tool are each a single install.

Work through it once, then keep it as your default for every new vibe-coding project.

• Search for .env files, credentials files, and tokens in shell profiles, then delete the plaintext copies.
• Rotate every key that was ever in a readable file or a repository.
• Pick one local vault: macOS Keychain for simplicity, KeePassXC if you want zero cloud involvement.
• If a team shares credentials, self-host a Bitwarden-compatible server such as Vaultwarden.
• Inject secrets per command, never load them into the whole shell session.
• Keep production keys out of sessions where you are letting an agent run loose.