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Zero

A clean, terminal-first AI coding agent you fully own — multi-provider, scriptable, and safe by default.

Zero is a coding agent that lives in your terminal. It runs an agentic tool loop — reading, editing, searching, and running commands in your repo — against whatever model you choose. Zero has a Go-native core with an npm distribution wrapper; the Go runtime is the default app path.

Zero treats the model as a swappable, per-task choice — no single-vendor lock-in — and never mutates your system without a permission decision.

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Highlights

• 🔌 Multi-provider — OpenAI-compatible, Anthropic, and Gemini behind one interface, with a model registry (capabilities, context limits, cost). Bring your own key and endpoint.
• 🖥️ Premium TUI — Bubble Tea/Lip Gloss powers the Go-native terminal interface.
• 🤖 Headless & scriptable — zero exec with clean text / json / stream-json I/O and meaningful exit codes for CI and automation.
• 🧰 Real tools — read / write / edit files, apply_patch, grep, glob, bash, directory listing, and a live plan/todo.
• 🛡️ Safe by default — mutating tools are permission-gated; --skip-permissions-unsafe is an explicit, clearly-labeled opt-out.
• 💾 Durable sessions — local, append-only session event store with full-text search.
• 🩺 Operable — built-in doctor, config inspection, secret redaction everywhere, and update --check.

Quick start

Requires Go for local development and release tooling. The npm wrapper uses Node when Zero is installed as an npm package.

go run ./cmd/zero    # launch the interactive TUI

Point Zero at a model — either set environment variables:

export OPENAI_API_KEY=sk-...
# optional: any OpenAI-compatible endpoint / model
export OPENAI_BASE_URL=https://api.openai.com/v1
export OPENAI_MODEL=gpt-4.1

…or save reusable provider profiles in ~/.config/zero/config.json and manage them with zero providers. Run zero doctor anytime to verify your setup.

Usage

Interactive (TUI)

go run ./cmd/zero    # or: zero after installation

Inside the TUI: type to chat and press Enter to send. / opens command suggestions (Tab accepts the first). When the prompt is empty, the arrow keys, PgUp/PgDn, and Home/End scroll the transcript. Ctrl+C exits.

Headless (exec)

# one-shot
zero exec "explain internal/agent/loop.go and suggest one improvement"

# from a file, with a specific model, as JSON for scripts
zero exec --file task.md --model claude-sonnet-4.5 --output-format json

# multi-turn / programmatic over stdio
zero exec --input-format stream-json --output-format stream-json < turns.jsonl

exec flags: -f, --file · -m, --model · -C, --cwd · -i, --input-format <text|stream-json> · -o, --output-format <text|json|stream-json> · --skip-permissions-unsafe. stdout carries only program output; logs go to stderr. See docs/STREAM_JSON_PROTOCOL.md.

Other commands

zero providers list|current                 # inspect resolved provider profiles
zero models list [--provider anthropic]     # inspect the model registry
zero search "<query>" [--json --session <id> --type <event>]   # search local sessions
zero doctor [--connectivity] [--json]        # health checks
zero config [--json]                          # inspect resolved configuration
zero sandbox policy [--json]                 # inspect sandbox backend support
zero serve --mcp [-C <path>]                  # expose Zero read-only tools over MCP stdio
zero update --check [--json --target windows-x64] # check for a newer release

Providers & models

Selectable per task and per session. The model registry knows each model's provider, capabilities, context window, and cost.

Provider	Example models
OpenAI-compatible	gpt-4.1, gpt-4.1-mini, gpt-4o, gpt-4o-mini
Anthropic	claude-opus-4.1, claude-sonnet-4.5, claude-haiku-4.5
Google Gemini	gemini-2.5-pro, gemini-2.5-flash, gemini-2.5-flash-lite

Any OpenAI-compatible endpoint works with just a base URL, key, and model — so local runtimes (Ollama, gateways, etc.) plug in the same way.

Tools

Tool	Purpose	Side effect
read_file · list_directory · grep · glob	explore & search	read
update_plan	maintain a live task plan	plan
write_file · edit_file · apply_patch	create & modify files	write (gated)
bash	run shell commands	shell (gated)

Write/shell tools route through the permission policy before any side effect.

Architecture

 Terminal (Bubble Tea target)   headless `exec`      (future) editor ext
            └───────────────────┬───────────────────────┘
                    Go-native core target (loop, events, tools)
   ┌──────────┬───────────┬──────────┬──────────┬───────────┬──────────┐
 providers   tools     sessions    usage     redaction    doctor /   stream-json
 + registry  registry  + search   + cost                  config

• Go-native target: cmd/zero is the default production runtime; the npm package delegates to the built Go binary.
• Surface-agnostic core: the agent loop streams text + tool calls, executes tools, and emits a typed event stream consumed identically by every surface.
• Edges are interfaces: Provider, Tool, SessionStore, and the permission policy are swappable.
• Model is data: capabilities, cost, and routing live in the registry — never hard-coded.

Project layout

cmd/
  zero/                  # production Go CLI entrypoint
  zero-pr-review/        # deterministic PR review helper
internal/
  agent/                 # Go agent loop and tool-call orchestration
  cli/                   # interactive/headless command surface
  config/                # layered configuration and provider profiles
  providers/             # OpenAI-compatible, Anthropic, Gemini adapters
  tools/                 # read/write/edit/bash/grep/glob/apply_patch tools
  tui/                   # Bubble Tea terminal interface
  sessions/ search/      # append-only sessions and local search
  usage/ modelregistry/  # token usage and model metadata/costs
  doctor/ verify/        # diagnostics and self-verification
  streamjson/            # headless stream-json protocol
  mcp/ plugins/ hooks/   # extension-facing runtime surfaces
bin/                     # npm wrapper entrypoint
scripts/                 # installers
docs/                    # PRD + protocol/install/perf docs

Development

go test ./...                     # run the test suite
go run ./cmd/zero-release build   # compile the release-facing Go binary
go run ./cmd/zero-release smoke   # verify the release-facing Go binary
go run ./cmd/zero-perf-bench      # performance benchmarks (see docs/PERFORMANCE.md)

Cross-compile by passing Go targets to the builder:

go run ./cmd/zero-release build --goos linux --goarch amd64
go run ./cmd/zero-release build --goos windows --goarch amd64 --output dist/zero.exe

Install from a release

# Linux / macOS
scripts/install.sh

# Windows
powershell -ExecutionPolicy Bypass -File scripts/install.ps1

See docs/INSTALL.md for version, repository, and install-path overrides, and docs/UPDATE.md for the update flow.

Documentation

• Product Requirements (PRD) — vision, goals, full feature spec, roadmap
• Stream-JSON protocol — headless I/O contract
• Headless exec PRD
• npm wrapper smoke checklist
• Performance · Install · Update

Contributing

Contributions are welcome — see CONTRIBUTING.md. Please run go test ./... and the relevant build or smoke command before opening a PR.

License

License is being finalized; a LICENSE file will be added before a public release.

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_{Go-native core with an npm distribution wrapper.}