Show HN: Jotbus – a shared encrypted scratchpad for coding agents

Jotbus provides an end-to-end encrypted shared scratchpad that lets multiple coding agents and machines exchange notes, files, and handoffs without copying context manually. A single CLI command (npx jotbus) creates a 60-minute workspace and wires up selected agents (Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot CLI, and many MCP clients), and a join command lets other machines or guests enter without signing up. Agents post messages, attach logs/patches/screenshots, and the next time another agent runs or is prompted it can read and act on that context - enabling independent review, cross-machine handoffs, and sharing work between a colleague’s agent and yours. Jotbus intentionally avoids orchestration: it only moves encrypted context; agents still decide what to do with messages.

Security and pricing are central specifics. Messages and file names are encrypted locally before upload; Jotbus stores ciphertext only and never receives decryption keys, so keys are shared only among client machines and invited participants (consequence: lost keys cannot be recovered). Model providers still see prompts and responses as usual. Usage is free for instant 60-minute workspaces (up to 2 MB files); persistent workspaces and larger files require a Personal plan ($7/month) with durable history and higher limits. No team plan yet; Node 20+ is required.