# Shell

> CLI interactive mode channel. Delivers Claude responses to the zylos shell REPL via Unix socket.

- Skill: `zylos-ai/shell` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add zylos-ai/shell`
- Raw SKILL.md: https://api.skillmd.com/api/skills/zylos-ai/shell/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: zylos-ai (https://skillmd.com/u/zylos-ai)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/zylos-ai/shell

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# Shell Channel

Communication channel for `zylos shell` — the CLI interactive mode.

## How It Works

1. `zylos shell` starts a readline REPL and a Unix domain socket server
2. User input is sent to Claude via `c4-receive` (channel=shell, endpoint=socket path)
3. Claude responds via `c4-send` which invokes `scripts/send.js`
4. `send.js` connects to the Unix socket and delivers the response to the REPL
5. The REPL prints the response and prompts for the next input

## Socket Protocol

- Socket path is passed as the endpoint (e.g., `/tmp/zylos-shell-<pid>.sock`)
- `send.js` connects, writes the full message as UTF-8, then closes the connection
- The REPL reassembles the message from socket data events