[gPTY](https://godot-pty.github.io/gpty/) - a PTY foundation built on Godot and Rust. Provides a tiling grid for panes (terminal, code, file-tree, etc.), a concept capture engine, and a JSON-RPC/MCP control surface so AI agents and automation tools can spawn panes, inject text, and observe output on terminals without scraping a TUI.

## Overview

<div align="center">

  [![Build](https://img.shields.io/github/actions/workflow/status/godot-pty/gpty/ci.yml?branch=main)](https://github.com/godot-pty/gpty/actions/workflows/ci.yml)
  ![GitHub Downloads (all assets, all releases)](https://img.shields.io/github/downloads/godot-pty/gpty/total)
  &nbsp;&nbsp;&nbsp; <img src="https://img.shields.io/badge/Built%20With:-gray" alt="Built With">
  <img src="https://img.shields.io/badge/Gemini-8E75B2?logo=googlegemini&logoColor=white" alt="Gemini">
  <img src="https://img.shields.io/badge/DeepSeek-4D6BFE?logo=deepseek&logoColor=white" alt="DeepSeek">
  <img src="https://img.shields.io/badge/Claude-D97757?logo=claude&logoColor=white" alt="Claude">

</div>

- **PTY** - Spawn and manage independent shell sessions in a resizable tiling grid. Full `DEC STD 070` via `alacritty_terminal`: `16`/`256`/`true color`, scrollback with regex search, wrapped text selection.
- **Public API** - JSON-RPC IPC socket + CLI (`gpty new-pane`, `gpty inject`, …) + MCP server. AI agents, scripts, and orchestrators drive the workspace over a documented, versioned protocol.
- **Concept engine** - RegEx triggers on PTY output capture the reply and route it into adjacent panes (code viewer, Inspector). Write your own - by hand or in the visual graph editor (Settings → Concepts) - or ship the defaults. Concepts capture and display only - they never inject input into a shell.
- **Agent observability** - Reasoning pane passively projects documented agent lifecycle events (OMP, extensible); Inspector pane runs a private, tool-free Q&A session. Observability only - gpty never orchestrates agent state.
- **Persistence** - Scrollback, settings, workspaces (named tab sets), and profiles auto-save to SQLite/JSON and restore on restart; full-text search across each pane's persisted history.
- **Cross-platform** - Standalone binaries for Linux, macOS, and Windows. No Godot or Rust toolchain required to run.
- **Documentation** - https://godot-pty.github.io/gpty/
- The vast majority of this codebase, including most of the Godot UI layout and the Rust (`gpty-core`) GDExtension bridge, was generated using LLMs; and as such, the underlying code may contain unidiomatic patterns and/or bugs.

| Component | Choice | Rationale |
|----------|--------|-----------|
| PTY library | `portable-pty` | Cross-platform (Linux `/dev/ptmx` + Windows ConPTY) with a single API |
| ANSI parsing | `vte` crate | Fast Rust ANSI state machine |
| Async runtime | `tokio` | Per-terminal tasks; channel-driven capture state machine |
| I/O threading | Dedicated `std::thread` per PTY | Predictable blocking reads; bridges to tokio via `mpsc` |
| Concept capture | Rust `regex` over parsed `LineParser` output | Linear-time matching (ReDoS-safe); captures buffer raw bytes for grid-faithful replay |
| Grid rendering | `alacritty_terminal` | Full DEC STD 070 grid state machine; pass arrays to Godot `_draw()` |
| Godot bridge | `gdext 0.5` | Native GDExtension for Godot 4.7+ |
| Rust edition | 2024 | Requires Rust >= 1.85 |

---

## Installation & Usage

Standalone binaries (no Godot install required) are published on [GitHub Releases](https://github.com/godot-pty/gpty/releases) for Linux, macOS, and Windows.

| Platform | Package |
|---|---|
| Linux | `gpty-v0.5.6-linux-x86_64.tar.gz` - extract; `./gpty-gui.sh` starts the GUI, `./gpty` is the CLI |
| macOS | `gpty-v0.5.6-macos.zip` - unzip, right-click the `.app` → Open; `gpty` beside it is the CLI |
| Windows | `gpty-v0.5.6-windows-x86_64.zip` - unzip; `gpty-gui.exe` starts the GUI, `gpty.exe` is the CLI |

Each release publishes a `SHA256SUMS` listing every asset. Check the file you downloaded before running it:

```bash
sha256sum -c SHA256SUMS            # Linux
shasum -a 256 -c SHA256SUMS        # macOS
certutil -hashfile <asset> SHA256  # Windows
```

Checksums catch a corrupted or tampered download in transit. Each asset also carries a build-provenance attestation binding it to the workflow run that built it:

```bash
gh attestation verify <asset> --repo godot-pty/gpty
```

The binaries are not code-signed (see [SECURITY.md](SECURITY.md)).

### CLI

The `gpty` binary controls a running GUI over JSON-RPC IPC, and every release bundle ships it next to the GUI. The CLI starts one on demand only for commands a fresh workspace can satisfy — `new-pane` and `layout load` — while `gpty daemon start` starts one explicitly and `--no-daemon` never starts one. Every other command needs a workspace that already exists, so it fails with `no gpty GUI is running (start one with \`gpty daemon start\`)` instead of opening a window it cannot use. Building from source (`cargo build -p gpty`, or `cargo build --workspace`) is only needed when working on the CLI itself; if you install it that way, **reinstall it after a version bump** (`cargo install --path crates/gpty-cli --force`). A stale `gpty` earlier on `PATH` shadows the release's CLI and fails opaquely (a subcommand it lacks dies in clap before any IPC), which is why the CLI warns once, on stderr, when it sees that the running GUI's version or IPC protocol differs from its own — the warning names both sides, but the reinstall is the fix.

Once the GUI is running (launched from Godot or a release binary), the CLI connects over a Unix socket (`$XDG_RUNTIME_DIR/gpty.sock` on Linux, or `GPTY_SOCKET` env var):

```bash
# Check if the GUI is running (exit 1 when it is not)
gpty daemon status

# Print the bundled agent skill (for coding agents running inside a pane)
gpty --skill

# Declare this pane's agent state, from inside the pane (display only)
gpty state working

# Spawn a new terminal pane
gpty new-pane --pane-type terminal

# List all active panes
gpty list-panes

# Send text to a pane (by label, e.g. T1)
gpty inject T1 --text "echo hello"

# Close a pane
gpty kill-pane T1

# Save and load named layouts
gpty layout save my-setup
gpty layout load my-setup
gpty layout list

# Install a plugin (reviewed in the GUI — its actions run as you)
gpty plugin install godot-pty/gpty-omp
gpty plugin list

# Manage the GUI daemon
gpty daemon start
gpty daemon status
gpty daemon stop

# Generate AI tool manifests (no GUI needed)
gpty schema
gpty schema --format mcp

# Run as MCP server over stdio (no GUI needed)
echo '{"jsonrpc":"2.0","id":1,"method":"initialize"}' | gpty mcp
```

See `gpty --help` for all subcommands and flags.

### MCP integration

gpty ships an MCP (Model Context Protocol) server so AI agents and coding harnesses can control the workspace. The repo-root [`mcp.json`](mcp.json) declares it for auto-discovery:

```json
{"mcpServers": {"gpty": {"command": "gpty", "args": ["mcp"]}}}
```

- **Direct**: run `gpty mcp` over stdio - exposes a tool per CLI subcommand (`new-pane`, `list-panes`, `kill-pane`, `focus-pane`, `inject`, `pane-read`, `pane-status`, `pane-run`, `pane-wait`, `broadcast`, `layout-*`, `daemon-*`, `concept-*`, `version`).
- **Manifest**: `gpty schema --format mcp` prints the MCP tool manifest (JSON Schema, works without a running GUI) for hand-off to agent configurations.

Tool schemas are generated from the same clap definitions as the CLI (`crates/gpty-cli/src/commands/schema.rs`), so they cannot drift from `gpty --help`.

---

## Roadmap

See [ROADMAP.md](ROADMAP.md) for the full feature inventory.

---

## Security

See [SECURITY.md](SECURITY.md) for the threat model, reporting process, and what gpty does *not* defend against. Implementation rules - the Concept Engine's ReDoS stance, PTY environment sanitization, IPC hardening, OSC 52 restrictions - live in [AGENTS.md](AGENTS.md#security).

---

## Contributing

See [CONTRIBUTING.md](CONTRIBUTING.md) for setup instructions, build commands, testing, code style, and the pull request process.

---

## Changelog

See [CHANGELOG.md](CHANGELOG.md) for the complete versioned changes and history.

---

## License

gPTY is free software, licensed under the **GNU General Public License, version 3 or later** — see [LICENSE](LICENSE) for the full text.

[LICENSE-EXCEPTIONS.md](LICENSE-EXCEPTIONS.md) adds two permissions under section 7 of that license, so the ecosystem side stays permissive:

- **Plugins, extensions, and adapters are not required to be GPLv3.** Anything that works with gPTY over its CLI, JSON-RPC, MCP, or event interfaces — including native pane types — may be licensed under Apache-2.0, MIT, or any other terms you choose, and shipped alongside gPTY without obligation.
- **Configuration and data files carry no copyleft.** Profiles, workspaces, layouts, concepts, and settings are yours to license however you like; the default `*.json` files shipped with gPTY are Apache-2.0.

Copyright (C) 2026 Neil Pathare.

gPTY is distributed in the hope that it will be useful, but absolutely without any warranty and assumes no liability for any usage by end-users; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.