Line CLI

Line CLI (line) is a coding agent that lives in your terminal. It reads and edits your project, runs commands with your approval, and splits big jobs across parallel sub-agents on your machine.

curl -fsSL https://install.clatterlabs.xyz/line | sh    # macOS / Linux
line login                                               # sign in with your Clatter Labs account
line                                                     # start the agent in your project

Features

• Streaming TUI with Markdown, code and table rendering, multiline input (Shift+Enter, Alt+Enter or Ctrl+J), scrolling with the mouse wheel or PgUp/PgDn (the view stays put while output streams), Esc to interrupt, Ctrl+C to exit.
• SuperCosmos 1.1: SuperCosmos (efforts Flash, Max, Heavy, plus auto routing; 550B parameters, 55B active, 1M-token context). Switch effort with /effort. Line Code was retired on Nov 1, 2026; a saved Line Code choice moves to SuperCosmos automatically (details).
• Local tools with approval prompts: read, write, edit and multi-edit files (diff preview), move and delete, list folders, glob, grep, run shell commands (in the background too, for dev servers and watchers), read-only git, diagnostics (your project's own type checker, compiler or linter), a repo map (a ranked outline of the codebase, built with tree-sitter), Jupyter notebook edits, web search and fetch, and a visible to-do plan.
• Parallel sub-agents: the agent starts sub-agents on your machine to explore, research and review (read-only) or to do real work with full tools (general). Line locks files per agent, makes each agent read a file before editing it, and refuses an edit when the file changed since that agent read it, so parallel edits never overwrite each other. The Agents panel shows them live; /agents lists runs and their reports.
• MCP: connect MCP servers (stdio or HTTP) in ~/.line/mcp.json or your project's .mcp.json; their tools appear to the agent. /mcp shows them, line mcp lists them from the shell. Project servers start only after you trust them.
• Hooks: run your own scripts on PreToolUse, PostToolUse, UserPromptSubmit, Stop and SessionStart (/hooks).
• Project instructions: LINE.md (or AGENTS.md) in the project and ~/.line/LINE.md are always followed; /init writes one.
• See every change: /diff shows this session's changes (/diff split side by side), /files lists them by turn and agent; every file change is checkpointed, so /undo and /rewind take it back.
• Context and usage: a live context meter in the status bar, /context breaks the window down, and auto-compact starts at about 80% of the model's real context window. /usage shows how much of your plan's limits you've used and when they reset, credits, and tokens and cost per model; /cost this session.
• Arabic, natively: right-to-left text is shaped (joined letters), shown in the right order and right-aligned, mixed with English and code, in answers and in the input box. /rtl switches it (terminal if your terminal already handles bidi).
• Plan mode and permission modes: Shift+Tab cycles ask → accept edits → auto → plan.
• @file mentions, a live to-do panel, and a status bar with tokens, context and files changed.
• Busy models don't fail your turn: Line waits and retries with backoff, and shows it.
• Skills and plugins you control: nothing runs until you approve or enable it.
• Sessions saved locally; line -c continues the last one in a folder.

Safety defaults

• Writes and shell commands ask first. Shift+Tab cycles the mode: ask, accept edits (file edits run, commands still ask), auto (nothing asks), plan (read-only); line -y starts in auto. Sub-agents follow the same mode; their approvals queue in the main window.
• Files that usually hold secrets (.env, SSH and cloud credentials, private keys) always ask, even with auto-approve on.
• Read-only commands that run without asking are limited to the project folder.
• Project MCP servers and hooks run only after you trust them.
• Commands Line runs never see Line's own sign-in token.

Pricing

Line is covered by your plan (Free included), with usage valued at the SuperCosmos rate of the effort each call ran on (see Models). Every plan, Free included, includes every effort.