feat: gigacode

server/packages/gigacode/Cargo.toml

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+[package]
+name = "gigacode"
+version.workspace = true
+edition.workspace = true
+authors.workspace = true
+license.workspace = true
+description = "Sandbox Agent CLI with OpenCode attach by default"
+repository.workspace = true
+
+[[bin]]
+name = "gigacode"
+path = "src/main.rs"
+
+[dependencies]
+clap.workspace = true
+sandbox-agent.workspace = true
+tracing.workspace = true

server/packages/gigacode/README.md

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+# GigaCode
+
+Use [OpenCode](https://opencode.ai)'s UI with any coding agent.
+
+Supports Claude Code, Codex, and Amp.
+
+This is __not__ a fork. It's powered by [Sandbox Agent SDK](https://sandboxagent.dev)'s wizardry.
+
+> **Experimental**: This project is under active development. Please report bugs on [GitHub Issues](https://github.com/rivet-dev/sandbox-agent/issues) or join our [Discord](https://rivet.dev/discord).
+
+## How It Works
+
+```
+┌─ GigaCode ────────────────────────────────────────────────────────┐
+│ ┌─────────────────┐    ┌─────────────────┐    ┌─────────────────┐ │
+│ │  OpenCode TUI   │───▶│  Sandbox Agent  │───▶│  Claude Code /  │ │
+│ │                 │    │                 │    │   Codex / Amp   │ │
+│ └─────────────────┘    └─────────────────┘    └─────────────────┘ │
+└───────────────────────────────────────────────────────────────────┘
+```
+
+- [Sandbox Agent SDK](https://sandboxagent.dev) provides a universal HTTP API for controlling Claude Code, Codex, and Amp
+- Sandbox Agent SDK exposes an [OpenCode-compatible endpoint](https://sandboxagent.dev/opencode-compatibility) so OpenCode can talk to any agent
+- OpenCode connects to Sandbox Agent SDK via [`attach`](https://opencode.ai/docs/cli/#attach)
+
+## Install
+
+**macOS / Linux / WSL (Recommended)**
+
+```bash
+curl -fsSL https://releases.rivet.dev/sandbox-agent/latest/gigacode-install.sh | sh
+```
+
+**npm i -g**
+
+```bash
+npm install -g gigacode
+gigacode --help
+```
+
+**bun add -g**
+
+```bash
+bun add -g gigacode
+# Allow Bun to run postinstall scripts for native binaries.
+bun pm -g trust gigacode-linux-x64 gigacode-linux-arm64 gigacode-darwin-arm64 gigacode-darwin-x64 gigacode-win32-x64
+gigacode --help
+```
+
+**npx**
+
+```bash
+npx gigacode --help
+```
+
+**bunx**
+
+```bash
+bunx gigacode --help
+```
+
+> **Note:** Windows is unsupported. Please use [WSL](https://learn.microsoft.com/en-us/windows/wsl/install).
+
+## Usage
+
+**TUI**
+
+Launch the OpenCode TUI with any coding agent:
+
+```bash
+gigacode
+```
+
+**Web UI**
+
+Use the [OpenCode Web UI](https://sandboxagent.dev/opencode-compatibility) to control any coding agent from the browser.
+
+**OpenCode SDK**
+
+Use the [`@opencode-ai/sdk`](https://sandboxagent.dev/opencode-compatibility) to programmatically control any coding agent.

server/packages/gigacode/src/main.rs

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+use clap::Parser;
+use sandbox_agent::cli::{
+    CliConfig, CliError, Command, GigacodeCli, OpencodeArgs, init_logging, run_command,
+};
+
+fn main() {
+    if let Err(err) = run() {
+        tracing::error!(error = %err, "gigacode failed");
+        std::process::exit(1);
+    }
+}
+
+fn run() -> Result<(), CliError> {
+    let cli = GigacodeCli::parse();
+    let config = CliConfig {
+        token: cli.token,
+        no_token: cli.no_token,
+        gigacode: true,
+    };
+    let command = cli
+        .command
+        .unwrap_or_else(|| Command::Opencode(OpencodeArgs::default()));
+    if let Err(err) = init_logging(&command) {
+        eprintln!("failed to init logging: {err}");
+        return Err(err);
+    }
+    run_command(&command, &config)
+}