Looplane's TUI and plain CLI are two interfaces over the same runtime paths. The CLI selects a presentation mode from TTY state and flags, runners emit events, and the TUI projects those events into thinking, tool, approval, verification, and terminal states. The screen distinguishes native and external runtimes without treating UI entry points as proof of backend maturity.
Claude Code writes every session line by line to a JSONL file under ~/.claude/projects/, kept for 30 days by default. This post breaks down --continue vs --resume, session naming rules, /branch fork semantics, and transcript export and cleanup settings.
Work through install and login failures in five steps: verify PATH on your OS, confirm there is only one installation, test downloads.claude.ai for a 200, recover failed OAuth callbacks by pasting the login code or using claude auth login, then finish with claude doctor.
Mature coding-agent CLIs have converged on the same conventions: positional prompt, -p means print, exec is headless, resume is a first-class command, -C changes directory; looplane inherits this vocabulary directly, driving learning cost close to zero.
A blank config file drives people away; a bad credential discovered too late drives them away faster. All five mature agents treat setup as a first-class state, and looplane adds the step most of them skip: verify the key right after saving it.
At Google I/O 2026, Antigravity CLI (agy) replaced Apache 2.0 Gemini CLI with a closed-source Go binary. Technical upgrades — multi-agent orchestration, native sandbox, millisecond startup — but free tier cut 98%, open-to-closed source, 28-day transition window. Community reaction was sharp.
Grok Build is xAI's Rust coding agent — 845K LOC, 8 parallel sub-agents, Arena Mode. May 2026 beta, July open-sourced (Apache 2.0) — but the direct trigger for open-sourcing was a privacy incident: it silently uploaded entire repos (including SSH keys, .env files) to Google Cloud Storage at a 27,800x traffic ratio. The exfiltration code remains in the binary, disabled only by a server-side flag.
In August 2026, Meta Superintelligence Labs released Muse Code beta. Closed-source static binary, Muse Spark 1.2 model, parallel persistent sub-agents with worktree isolation. The biggest controversy is pricing: Standard at $1.25/$4.25 per M tokens, or Contributor at $0.10/$0.20 — 20x cheaper, but your code enters Meta's training pipeline.
DeepSeek Harness (dsh) is DeepSeek's official open-source coding agent framework, released as a v0.1 developer preview on 2026-08-13, accumulating 184,000+ stars in 9 days. Its core is the Cordis plugin kernel — model adapters, tools, agent loop, and UI are all swappable plugins. Four runtime modes, with the ability to use Claude Code and Codex as sub-agents. Web UI first, no native CLI.
OMP 2 is no longer a Pi fork. The entire codebase has been rewritten from scratch in Rust, with ~41 crates covering a custom bash engine, GPU-accelerated GUI, embedded CPython 3.14t, gRPC transport, and Kokoro-82M TTS. Currently in pre-release with no stable version yet.
Opencode 2 is a major rewrite led by Anomaly (Dax Raad). Runtime migrated from Bun to Node.js (memory issues), desktop from Tauri to Electron (WebKit perf and Node integration), v1 API intentionally incompatible. New: multi-tab parallel sessions, persistent backend service, HTTP API + SDK. Currently beta, stable estimated ~September 2026. ~200K stars.
Pi v0.84.0 (2026-08-06) promotes the AgentHarness v2 API to stable. Lane-based v4 Session model makes operations durable and interruptible. CBOR replaces JSON, Unix sockets replace HTTP. Earendil Inc. (Armin Ronacher's PBC) behind it has secured initial funding. 95.4K stars, still MIT, still minimal.
Aider is a terminal AI pair programmer dating back to 2023 (Python, Apache-2.0, ~48.3k stars), designed against the grain of today's autonomous agents: you control context by hand with /add, every edit becomes its own atomic git commit, and architect/editor mode splits planning from editing across two models. But note the maintenance cadence: the latest PyPI release is 0.86.2 from 2026-02, the last commit was 2026-05, and the site still recommends Claude 3.7 Sonnet and o1.
Amp spun out of Sourcegraph in December 2025 as Amp Frontier Corporation, and its npm package moved from @sourcegraph/amp to @ampcode/cli. Its defining trait is deletion: the editor extension, Amp Tab, TODO lists, Fork, custom commands, and public threads have all been removed. Monthly subscriptions only arrived on 2026-07-18 (Megawatt $20, Gigawatt $200); before that it was pay-as-you-go only. The current focus is orbs — remote machines that keep working after you close your laptop.
Copilot CLI went GA on 2026-02-25 and is included in every Copilot plan, Free included. Its differentiator isn't the agent — it's the GitHub integration: a built-in GitHub MCP server that works on issues and PRs, org policies inherited automatically, and an `&` prefix that hands work to the cloud coding agent. Billing runs on GitHub AI Credits (1 credit = $0.01): Pro $10/mo includes $15, Pro+ $39 includes $70, Max $100 includes $200.
omp is a fork of Pi, but it is not just a plugin layer stacked on top: it adds roughly 80,000 lines of Rust, pulling grep, shell, AST, and PTY in-process. Built-in tools go from Pi's 7 to 31, plus 14 LSP ops, 28 DAP ops, and 60+ providers. One codebase, two opposite bets.
Antigravity CLI is a terminal agent Google announced at I/O on May 19, 2026. Written in Go (versus Gemini CLI's Node.js), its binary is called agy, and it shares the same agent harness as the desktop Antigravity 2.0. It is also Gemini CLI's successor — the personal-tier Gemini CLI service ends on June 18, 2026.
goose is an open-source AI Agent maintained by the Linux Foundation's AAIF, supporting 15+ LLM providers and 70+ MCP extensions, built with Rust as a Desktop App + CLI + API. It positions itself as a vendor-neutral, self-hostable alternative to Claude Code.
MCP is not going away, but its effective scope is narrower than most people think. For local development, CLI and raw API almost always beat MCP. MCP's truly irreplaceable niche is the narrow gap of 'cross-agent shared local tool layer.'
Agent CLIs are not smarter autocomplete tools -- they are AI agents that can read your codebase, execute multi-step tasks, and operate in real environments. Claude Code, Codex CLI, Gemini CLI, OpenCode, Aider, Pi, Kiro, Amp, Cursor CLI... the tools keep multiplying, but they all share a common set of design principles -- understanding these principles is how you actually get good at using them.
Claude Code is Anthropic's agentic coding tool that runs in the terminal, IDEs, Slack, GitHub, and on the web. Its core extension system has six layers: CLAUDE.md (persistent context), Skills (on-demand workflows), Hooks (deterministic automation), Subagents (isolated delegation), MCP (external tool connections), and Agent Teams (multi-agent collaboration).
Codex CLI is OpenAI's open source terminal coding agent (Rust, Apache-2.0, ~106.6k stars) with MCP, subagents, image input, code review, and Skills. The model line is now GPT-5.6 Sol / Terra / Luna, and the desktop app, CLI, and IDE extension share one config.toml.
Gemini CLI is Google's open source terminal AI agent (Apache 2.0, ~106.6k stars). It once offered 60 requests per minute and 1,000 per day for free, with a 1M context window. The individual tier stopped serving on 2026/6/18 and Antigravity CLI took over. The project isn't shut down — the repo is still maintained — but it now serves only Gemini Code Assist Standard/Enterprise licenses and paid API keys.
OpenCode is an open-source AI coding agent written in TypeScript (MIT, ~198K GitHub stars, repo at anomalyco/opencode) with a built-in TUI, 75+ LLM providers, LSP integration, a Vim-style editor, SQLite session management, and a desktop app. Free, no subscription, local or cloud models.
Pi is a minimalist coding agent by Mario Zechner (TypeScript, MIT, ~93K stars) with just 4 core tools and a very short system prompt — everything else you add yourself via Extensions, Skills, and Prompt Templates. It deliberately omits MCP, sub-agents, plan mode, and permission popups. The repo is now earendil-works/pi and the npm scope is @earendil-works.
When processing requests, Claude Code randomly displays one of 185 built-in verbs (like Thinking, Brewing, Clauding), then picks one of 8 completion verbs with elapsed time. You can customize these via spinnerVerbs in settings.json, using either replace or append mode. All data in this post is verified directly from cli.js source code.
claude -p turns Claude Code from an interactive terminal session into a command you can embed in scripts and CI: pipe data in, get structured JSON out with --output-format json, and skip most auto-discovery with --bare. This post focuses on CLI usage, then covers the four signals that mean it's time to switch to the Python or TypeScript Agent SDK.
Claude Code has five permission modes: default (confirm each step), acceptEdits (auto-accept edits), plan (read-only planning), auto (background AI classifier review), and bypassPermissions (YOLO, skip everything). Switch with Shift+Tab or configure via settings.json. Auto mode is the sweet spot — no step-by-step confirmations, but with safety guardrails.
Once SSH config is set up, scp works directly with aliases — no need to type out the full IP every time