agent-wormhole

A Claude Code session on your laptop can hand a file, a message, or a secret to a Claude Code session on another machine, sealed end to end so only the two of them can read it. Built on persistent secp256k1 identities, Nostr NIP-17 gift-wrapped DMs, and magic-wormhole for one-time pairing and bulk file transfer.

agent-wormhole is for agent collaboration that outlives a single terminal. Pair once, give each peer a name, and then agents can send context to each other as they work: the branch they are on, what they changed, logs, test output, screenshots, config snippets, or a file that needs review.

What you'd use it for

• Two people working on the same project, each with their own agent, sharing implementation notes, test fixtures, local repro steps, and review feedback without pasting everything through chat.
• One person coordinating agents on two machines: for example a local laptop agent driving the UI while a cloud or Linux box agent runs backend jobs, GPU tasks, browser tests, or long-running experiments.
• Parallel worktree sessions coordinating who edits what, and handing off context so the next session picks up where the last one left off.
• Getting a second opinion from another Claude running with a different model or prompt, and pulling the review back into the current session.
• Moving an API key, config file, or one-off artifact between machines, sealed end to end, addressable by peer name after first contact.

Quickstart

Install:

uv tool install agent-wormhole
# or
pip install agent-wormhole

A persistent keypair is created on first use at ~/.agent-wormhole/identity.key (mode 0600). See it:

$ agent-wormhole whoami
pubkey: 7f3a…
relays: wss://relay.damus.io, wss://nos.lol, wss://relay.primal.net

First contact (pairing)

The /agent-wormhole skill drives this; the two sides exchange identity envelopes over two short magic-wormhole codes (one each direction) and each writes the other into its trust file:

# Machine A → reads code aloud
agent-wormhole identity-envelope | wormhole send --text -

# Machine B → with A's code
wormhole receive <code-A>   # prints A's envelope JSON
agent-wormhole trust <A-pubkey> alice --relays <relays>

# Then reverse so A trusts B too.

Steady state

Keep a listener running; it emits one JSON line per inbound message:

$ agent-wormhole listen
{"type":"text","from":"alice","content":"hi","received_at":1700000000}
{"type":"file","from":"alice","name":"report.pdf","saved_to":"/tmp/agent-wormhole/alice/files/report.pdf","size":4096,…}

Send by peer name:

agent-wormhole send alice "hello from laptop"
agent-wormhole send-file alice ./config.json

Manage trust:

agent-wormhole peers
agent-wormhole untrust alice

Using it from Claude Code

agent-wormhole ships with a Claude Code skill. Install it:

agent-wormhole setup | claude

That symlinks ~/.claude/skills/agent-wormhole/SKILL.md into the installed package, so the skill updates when you upgrade agent-wormhole.

Then either session can run:

• /agent-wormhole pair <peer-name> to add a new peer (the skill walks both sides through it).
• /agent-wormhole to start the listener for an already-paired peer.

Outbound messages and files use agent-wormhole send / agent-wormhole send-file directly via Bash.

How it works

1. Identity: each machine holds a long-lived secp256k1 keypair (~/.agent-wormhole/identity.key, 0600). The x-only BIP-340 pubkey is the addressable name on the Nostr network.
2. Pairing: the skill runs wormhole send/receive to swap identity envelopes between two trusted hosts (one short code per direction). Each side calls agent-wormhole trust to record the peer.
3. Text messages: NIP-44 v2 encryption + NIP-17 three-layer gift-wrap (rumor → seal signed by sender → gift wrap signed by an ephemeral key). Relays see only kind=1059 events tagged for the recipient. Sender identity is hidden from the relay.
4. File transfer: send-file spawns a wormhole send subprocess, posts the negotiated code in an encrypted file-offer DM, and the recipient's listener auto-invokes wormhole receive (transfer authenticated by magic-wormhole's PAKE).
5. Relay pool: the listener and sender connect to N relays concurrently, dedupe events by id, and reconnect with backoff on disconnect.

Configuration

Relay list resolution order: AGENT_WORMHOLE_RELAYS env var (comma-separated) → ~/.agent-wormhole/config.json ({"relays":[…]}) → bundled defaults (damus, nos.lol, primal).

The wormhole CLI must be on PATH; it ships with the magic-wormhole Python dep.

Security

• Identity keys never leave their machine. Losing the keyfile means re-pairing with every peer.
• Messages are NIP-44 v2 (ChaCha20 + HMAC-SHA256, HKDF over ECDH x-coord). All known canonical test vectors pass.
• NIP-17 gift-wrap hides the sender from the relay. The recipient's pubkey is necessarily visible to the relay (it's used as the #p subscription filter); run your own relay or trust the chosen relay set's anonymity properties if you need stronger anonymity.
• File transfer uses magic-wormhole's PAKE handshake; only the negotiated short code (delivered over the encrypted DM) can complete the transfer.

License

MIT