mnw

A2AChannel — Design skill for Claude Code

Design community

Desktop workspace for coordinating multiple Claude Code agents with typed handoffs (accept / decline / cancel / expire), durable SQLite ledger, and a human-in-the-loop UI.

How to install A2AChannel

This entry records only its repository, not the path inside it, so there is no exact command to give. Open mnw/A2AChannel and copy the folder into ~/.claude/skills/, or the file into ~/.claude/agents/.

What A2AChannel does

Desktop workspace for coordinating multiple Claude Code agents with typed handoffs (accept / decline / cancel / expire), durable SQLite ledger, and a human-in-the-loop UI.

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README

A2AChannel

Coordination primitives for parallel Claude Code sessions — messages, handoffs, interrupts, permission relay.

![demo](docs/demo.gif)

Why

Every Claude Code session is an island. Sub-agents spawned via the `Task` tool run in their own fresh context — the parent only sees the final return value, not the sub-agent's intermediate reasoning. Separate Claude Code sessions are even more isolated: no parent, no shared anything. A2AChannel gives those independent sessions a shared room, structured handoffs, and interrupts, so they can coordinate without you shuttling context between windows. Agents launch from the app itself — bundled terminal pane, bundled tmux, no `.mcp.json` editing, no separate windows to juggle.

The coordination is a protocol, not a chat app. Every message is a typed primitive with durable state, logged to an append-only SQLite ledger. You're in the room too. Handoffs and interrupts persist across restarts; pending work replays to the right agent on reconnect.

Layout

Top to bottom:

Titlebar — icon buttons (Reveal MCP-configs in Finder, Edit global MCP servers, Settings/config.yml, Reload).
Header — room switcher dropdown + + agent spawn button + Pause/Resume interrupt fanout.
Nutshell strip — per-room project summary (one paragraph). Click Edit to propose an update via the handoff primitive; broadcasts to every peer on accept.
Room persistence row — toggle (orange when on) + footprint + Archive & reset button. Visible only when a concrete room is selected. See Persistent transcripts below.
Chat panel (left) and terminal pane (right) split by a draggable splitter. Chat has a mention popover (@), slash picker (/), emoji, attachments. The composer at the bottom has a focus-revealed hint row.
Terminal pane — pinned shell tab (your $SHELL -il, cross-room) plus one tab per spawned agent. The active tab pulses orange when an agent needs attention.
Footer — connectio