Inbox

/inbox — mail between my own machines

The "Claude on one machine → Claude on another" channel, over the synced _machine-bus folder (Syncthing, ~10s). It removes the human courier. Copy-paste by hand is an EMERGENCY channel only.

Check what arrived for me (the main use)

python "$USERPROFILE/.claude/scripts/machine_bus.py" read

Shows only what is NEW for THIS machine (matched by hostname) and marks it read. Then report to the operator what came in and act on it if needed.

• At session start the SessionStart hook already does this automatically — /inbox is for when the operator says "check the inbox" mid-session (e.g. something new arrived over sync).
• Re-check without marking as read: ... read --peek.

Send a message to Claude on ANOTHER machine

1. List the available mailboxes:

``bash python "$USERPROFILE/.claude/scripts/machine_bus.py" list ``

1. Send:

``bash python "$USERPROFILE/.claude/scripts/machine_bus.py" send "message text" ` The message must be self-contained (Claude on that machine has none of this session's context — include the goal, the steps, the paths, the values). It arrives in ~10s and surfaces for the recipient at session start or via /inbox`.

Which channel when

• The automatic mailbox (this skill + the hook) — the norm for everything cross-machine.
• A human courier (copy-paste) — ONLY if sync is down, the machines are off the shared network, or it is extremely urgent.

Boundaries

• Do not put secrets in the mailbox if third parties could see the file (across the owner's own machines it is fine).
• "Fresher beats older": edit conflicts are resolved by the operator (Syncthing leaves *.sync-conflict-* files).
• Delivery is not instant: Claude is not a daemon; the letter waits until a session opens on that machine (or a routine fires).

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About & contact

Built and battle-tested at Palo Alto AI Research Lab — a fleet of Claude Code machines running 24/7 as a second brain and synthetic cofounder. Every skill here survived real production use before publication.

• 📦 All 101 skills: https://github.com/tonydzi/second-brain-starter-kit
• 👤 Author: Anton Dziatkovskii — Telegram @tonydzi · WhatsApp +1 341 222 9178 · X @TonyStef_
• 🧪 Engineers: want to test-drive this setup? Message me — I hand out free starter seeds to engineers who test and report back. Custom skill requests welcome.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: tonydzi
• Source: tonydzi/second-brain-starter-kit
• License: MIT

Install and usage instructions live in the source repository linked above.