OpenCode (anomalyco/opencode)

OpenCode

https://github.com/anomalyco/opencode
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OpenCode is an open-source, provider-agnostic AI coding agent that offers LSP support, focuses on a...

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# OpenCode

OpenCode is an open-source AI coding agent that provides a terminal-based interface for AI-assisted software development. It supports multiple AI providers (Anthropic, OpenAI, Google, Azure, local models, and others) and offers a rich set of tools for file manipulation, code search, bash command execution, and web fetching. OpenCode differentiates itself from similar tools through its provider-agnostic architecture, built-in LSP support, vim-like TUI interface, and client/server architecture that enables remote operation.

The core functionality centers around interactive coding sessions where users communicate with AI agents via prompts. The AI can read/write files, execute commands, search code, browse the web, and manage todo lists. OpenCode supports Model Context Protocol (MCP) for extending functionality with external tools, a plugin system for custom integrations, multiple agent modes (build, plan, explore), and configurable permissions for tool usage. The project is built as a monorepo with packages for the main CLI, JavaScript SDK, desktop applications (Tauri and Electron), and a web console.

## Installation

Install OpenCode using any of the following methods.

```bash
# Quick install via curl
curl -fsSL https://opencode.ai/install | bash

# npm/pnpm/yarn/bun
npm i -g opencode-ai@latest

# Homebrew (macOS/Linux)
brew install anomalyco/tap/opencode

# Scoop (Windows)
scoop install opencode

# Chocolatey (Windows)
choco install opencode

# Arch Linux
sudo pacman -S opencode

# Nix
nix run nixpkgs#opencode
```

## CLI - Interactive TUI Mode

Launch OpenCode in interactive terminal UI mode.

```bash
# Start interactive TUI in current directory
opencode

# Start with a specific model
opencode --model anthropic/claude-sonnet-4-20250514

# Start with a specific agent
opencode --agent plan

# Continue the last session
opencode --continue

# Start in a specific directory
opencode --dir /path/to/project
```

## CLI - Run Command (Non-Interactive)

Execute a single prompt and receive output without interactive UI.

```bash
# Run a single prompt
opencode run "explain this codebase"

# Continue the last session with a new message
opencode run --continue "now add unit tests"

# Run with a specific model
opencode run --model anthropic/claude-sonnet-4-20250514 "refactor the auth module"

# Pipe input from stdin
echo "analyze this code" | opencode run

# Attach files to the message
opencode run --file ./src/main.ts "review this file"

# Output in JSON format for scripting
opencode run --format json "list all functions"

# Skip permission prompts (dangerous!)
opencode run --dangerously-skip-permissions "update dependencies"

# Attach to a running remote server
opencode run --attach http://localhost:4096 --password mypassword "check status"
```

## CLI - Server Mode

Start OpenCode as a headless HTTP server for remote access and API integrations.

```bash
# Start server on default port (random)
opencode serve

# Start server with specific host and port
opencode serve --hostname 0.0.0.0 --port 4096

# Set password via environment variable (recommended)
export OPENCODE_SERVER_PASSWORD=mysecretpassword
opencode serve --port 4096

# Server will output: opencode server listening on http://0.0.0.0:4096
```

## CLI - MCP Server Management

Manage Model Context Protocol servers for extending OpenCode's capabilities.

```bash
# List MCP server status
opencode mcp

# Start OAuth authentication for a remote MCP server
opencode mcp auth my-mcp-server

# Remove stored OAuth credentials
opencode mcp auth --remove my-mcp-server
```

## CLI - Model and Provider Management

Configure and list available AI providers and models.

```bash
# List all available providers
opencode providers

# List all available models across providers
opencode models

# Show models from specific provider
opencode models --provider anthropic
```

## CLI - Session Export/Import

Export and import session history for backup or sharing.

```bash
# Export a session to JSON
opencode export --session abc123 --output session.json

# Export all sessions
opencode export --all --output sessions/

# Import a session from JSON
opencode import session.json
```

## Configuration - opencode.jsonc

Configure OpenCode behavior through the configuration file at `~/.config/opencode/opencode.jsonc` or project-level `.opencode/opencode.jsonc`.

```jsonc
{
  "$schema": "https://opencode.ai/config.json",
  // Set default model
  "model": "anthropic/claude-sonnet-4-20250514",
  // Set small model for title generation
  "small_model": "anthropic/claude-3-5-haiku-latest",
  // Default agent to use
  "default_agent": "build",
  // Log level
  "logLevel": "INFO",
  // Share behavior: "manual", "auto", or "disabled"
  "share": "manual",
  // Auto-update behavior: true, false, or "notify"
  "autoupdate": "notify",
  // Custom username
  "username": "developer",
  // Disable specific providers
  "disabled_providers": ["azure"],
  // Additional instruction files to include
  "instructions": ["./AGENTS.md", "./.opencode/instructions.md"],
  // Tool output limits
  "tool_output": {
    "max_lines": 2000,
    "max_bytes": 51200
  },
  // Context compaction settings
  "compaction": {
    "auto": true,
    "prune": true,
    "tail_turns": 2
  },
  // Snapshot tracking for undo/redo
  "snapshot": true
}
```

## Configuration - Provider Setup

Configure AI providers with API keys and custom endpoints.

```jsonc
{
  "provider": {
    "anthropic": {
      "api_key": "sk-ant-xxx"
    },
    "openai": {
      "api_key": "sk-xxx",
      "base_url": "https://api.openai.com/v1"
    },
    "openrouter": {
      "api_key": "sk-or-xxx"
    },
    // Custom provider with OpenAI-compatible API
    "local-llm": {
      "api_key": "not-needed",
      "base_url": "http://localhost:11434/v1",
      "models": {
        "llama3": {
          "max_tokens": 8192
        }
      }
    },
    // Bedrock with profile authentication
    "bedrock": {
      "profile": "my-aws-profile",
      "region": "us-east-1"
    }
  }
}
```

## Configuration - Agent Customization

Customize built-in agents or define custom agents.

```jsonc
{
  "agent": {
    // Customize the build agent
    "build": {
      "system": "You are an expert software developer. Always write tests.",
      "model": "anthropic/claude-sonnet-4-20250514",
      "tools": {
        "bash": true,
        "write": true,
        "edit": true,
        "read": true,
        "glob": true,
        "grep": true
      }
    },
    // Customize the plan agent (read-only by default)
    "plan": {
      "system": "Analyze code and create implementation plans.",
      "tools": {
        "bash": false,
        "write": false,
        "read": true
      }
    },
    // Define a custom agent
    "reviewer": {
      "system": "You are a code reviewer. Focus on security and performance.",
      "model": "anthropic/claude-sonnet-4-20250514",
      "tools": {
        "read": true,
        "grep": true,
        "glob": true,
        "bash": false,
        "write": false
      }
    }
  }
}
```

## Configuration - MCP Servers

Configure Model Context Protocol servers for extended tool capabilities.

```jsonc
{
  "mcp": {
    // Local MCP server via stdio
    "filesystem": {
      "type": "local",
      "command": ["npx", "-y", "@modelcontextprotocol/server-filesystem", "/path/to/dir"],
      "enabled": true,
      "timeout": 30000,
      "environment": {
        "NODE_ENV": "production"
      }
    },
    // Remote MCP server via HTTP
    "remote-tools": {
      "type": "remote",
      "url": "https://mcp.example.com/api",
      "enabled": true,
      "headers": {
        "Authorization": "Bearer token123"
      }
    },
    // Remote MCP with OAuth
    "github-mcp": {
      "type": "remote",
      "url": "https://mcp.github.example.com",
      "oauth": {
        "clientId": "my-client-id",
        "scope": "read:repo write:repo"
      }
    }
  }
}
```

## Configuration - Permissions

Configure permission rules to auto-allow or deny tool usage.

```jsonc
{
  "permission": {
    "rules": [
      // Allow all read operations
      { "permission": "read", "action": "allow", "pattern": "**/*" },
      // Allow writing to specific directories
      { "permission": "write", "action": "allow", "pattern": "src/**" },
      { "permission": "write", "action": "allow", "pattern": "tests/**" },
      // Deny writing to sensitive files
      { "permission": "write", "action": "deny", "pattern": "**/.env*" },
      { "permission": "write", "action": "deny", "pattern": "**/secrets/**" },
      // Allow specific bash commands
      { "permission": "bash", "action": "allow", "pattern": "npm test" },
      { "permission": "bash", "action": "allow", "pattern": "npm run *" },
      { "permission": "bash", "action": "allow", "pattern": "git *" },
      // Deny dangerous commands
      { "permission": "bash", "action": "deny", "pattern": "rm -rf *" },
      { "permission": "bash", "action": "deny", "pattern": "sudo *" }
    ]
  }
}
```

## Configuration - Server Settings

Configure the OpenCode server for headless or web access.

```jsonc
{
  "server": {
    "hostname": "127.0.0.1",
    "port": 4096,
    // Basic auth password (or use OPENCODE_SERVER_PASSWORD env var)
    "password": "mysecretpassword",
    // Username for basic auth (default: "opencode")
    "username": "admin"
  }
}
```

## JavaScript SDK - Creating a Client

Use the JavaScript SDK to interact with OpenCode programmatically.

```typescript
import { createOpencodeClient, createOpencodeServer, createOpencode } from "@opencode-ai/sdk/v2"

// Connect to an existing OpenCode server
const client = createOpencodeClient({
  baseUrl: "http://localhost:4096",
  headers: {
    Authorization: `Basic ${Buffer.from("opencode:password").toString("base64")}`
  }
})

// Or start a new server and get a client
const { client, server } = await createOpencode({
  hostname: "127.0.0.1",
  port: 4096,
  timeout: 5000
})

// Check server health
const health = await client.global.health()
console.log(health.data) // { status: "ok", version: "1.14.22" }

// Clean up when done
server.close()
```

## JavaScript SDK - Session Management

Create and manage coding sessions programmatically.

```typescript
import { createOpencodeClient } from "@opencode-ai/sdk/v2"

const client = createOpencodeClient({ baseUrl: "http://localhost:4096" })

// List all sessions
const sessions = await client.session.list({ limit: 10 })
console.log(sessions.data)
// [{ id: "abc123", title: "Refactor auth", updatedAt: 1234567890 }, ...]

// Create a new session
const newSession = await client.session.create({
  title: "Add unit tests",
  permission: [
    { permission: "write", action: "allow", pattern: "tests/**" }
  ]
})
const sessionID = newSession.data.id

// Get session details
const session = await client.session.get({ sessionID })
console.log(session.data)

// Fork a session at a specific message
const forked = await client.session.fork({
  sessionID,
  messageID: "msg123"
})
console.log(`Forked to: ${forked.data.id}`)

// Delete a session
await client.session.delete({ sessionID: "old-session-id" })
```

## JavaScript SDK - Sending Prompts

Send prompts to AI agents and receive streaming responses.

```typescript
import { createOpencodeClient } from "@opencode-ai/sdk/v2"

const client = createOpencodeClient({ baseUrl: "http://localhost:4096" })

// Create a session first
const session = await client.session.create({ title: "Code Review" })
const sessionID = session.data.id

// Send a text prompt
await client.session.prompt({
  sessionID,
  parts: [{ type: "text", text: "Review the authentication module for security issues" }],
  model: { providerID: "anthropic", modelID: "claude-sonnet-4-20250514" },
  agent: "build"
})

// Send a prompt with file attachment
await client.session.prompt({
  sessionID,
  parts: [
    { type: "text", text: "Explain what this file does" },
    { type: "file", url: "file:///path/to/main.ts", filename: "main.ts", mime: "text/typescript" }
  ]
})

// Send async prompt (returns immediately)
await client.session.promptAsync({
  sessionID,
  parts: [{ type: "text", text: "Run the test suite and fix any failures" }]
})

// Execute a command
await client.session.command({
  sessionID,
  command: "review-pr",
  arguments: "123"
})

// Abort an active session
await client.session.abort({ sessionID })
```

## JavaScript SDK - Event Streaming

Subscribe to real-time events for session updates.

```typescript
import { createOpencodeClient } from "@opencode-ai/sdk/v2"

const client = createOpencodeClient({ baseUrl: "http://localhost:4096" })

// Subscribe to events
const events = await client.event.subscribe()

// Process events in a loop
for await (const event of events.stream) {
  switch (event.type) {
    case "message.updated":
      console.log(`Message updated: ${event.properties.info.role}`)
      break

    case "message.part.updated":
      const part = event.properties.part
      if (part.type === "text" && part.time?.end) {
        console.log(`AI: ${part.text}`)
      }
      if (part.type === "tool" && part.state.status === "completed") {
        console.log(`Tool ${part.tool} completed`)
      }
      break

    case "session.status":
      if (event.properties.status.type === "idle") {
        console.log("Session is idle")
      }
      break

    case "permission.asked":
      // Handle permission requests
      await client.permission.reply({
        requestID: event.properties.id,
        reply: "once" // or "always" or "reject"
      })
      break

    case "session.error":
      console.error(`Error: ${event.properties.error.name}`)
      break
  }
}
```

## JavaScript SDK - Configuration API

Read and update OpenCode configuration programmatically.

```typescript
import { createOpencodeClient } from "@opencode-ai/sdk/v2"

const client = createOpencodeClient({ baseUrl: "http://localhost:4096" })

// Get current configuration
const config = await client.config.get()
console.log(config.data)
// { model: "anthropic/claude-sonnet-4-20250514", share: "manual", ... }

// Update configuration
await client.config.update({
  config: {
    model: "openai/gpt-4o",
    logLevel: "DEBUG"
  }
})

// Get global configuration
const globalConfig = await client.global.config.get()

// List available providers
const providers = await client.config.providers()
console.log(providers.data)
// [{ id: "anthropic", name: "Anthropic", models: [...] }, ...]
```

## JavaScript SDK - MCP Integration

Interact with Model Context Protocol servers.

```typescript
import { createOpencodeClient } from "@opencode-ai/sdk/v2"

const client = createOpencodeClient({ baseUrl: "http://localhost:4096" })

// Get MCP server status
const status = await client.mcp.status()
console.log(status.data)
// { "filesystem": { status: "connected" }, "github": { status: "needs_auth" } }

// Connect/disconnect MCP servers
await client.mcp.connect({ name: "filesystem" })
await client.mcp.disconnect({ name: "filesystem" })

// Add a new MCP server
await client.mcp.add({
  name: "custom-tools",
  config: {
    type: "local",
    command: ["node", "./my-mcp-server.js"],
    enabled: true
  }
})

// Start OAuth flow for remote MCP
const authResult = await client.mcp.authStart({ name: "github-mcp" })
console.log(`Open this URL: ${authResult.data.authorizationUrl}`)

// Complete OAuth with authorization code
await client.mcp.authCallback({
  name: "github-mcp",
  code: "auth-code-from-callback"
})
```

## JavaScript SDK - File Operations

Read files and search the codebase.

```typescript
import { createOpencodeClient } from "@opencode-ai/sdk/v2"

const client = createOpencodeClient({
  baseUrl: "http://localhost:4096",
  directory: "/path/to/project"
})

// Read a file
const file = await client.file.read({ path: "src/main.ts" })
console.log(file.data.content)

// List files in directory
const files = await client.file.list({ path: "src" })
console.log(files.data)
// [{ name: "main.ts", type: "file", size: 1234 }, ...]

// Search for files by pattern
const found = await client.find.files({ pattern: "**/*.test.ts" })
console.log(found.data)

// Search for text in files
const results = await client.find.text({ query: "TODO:", path: "src" })
console.log(results.data)

// Search for symbols
const symbols = await client.find.symbols({ query: "handleAuth" })
console.log(symbols.data)
```

## JavaScript SDK - TUI Control

Control the Terminal UI programmatically.

```typescript
import { createOpencodeClient, createOpencodeTui } from "@opencode-ai/sdk/v2"

// Launch TUI with options
const tui = createOpencodeTui({
  project: "/path/to/project",
  model: "anthropic/claude-sonnet-4-20250514",
  session: "existing-session-id",
  agent: "build"
})

// Or control an existing TUI via API
const client = createOpencodeClient({ baseUrl: "http://localhost:4096" })

// Append text to the prompt input
await client.tui.appendPrompt({ text: "fix the bug in " })

// Submit the current prompt
await client.tui.submitPrompt()

// Clear the prompt
await client.tui.clearPrompt()

// Execute a command
await client.tui.executeCommand({ command: "/help" })

// Select a different session
await client.tui.selectSession({ sessionID: "abc123" })

// Show a toast notification
await client.tui.showToast({
  title: "Build Complete",
  message: "All tests passed",
  variant: "success",
  duration: 5000
})

// Open modal dialogs
await client.tui.openSessions()
await client.tui.openModels()
await client.tui.openHelp()

// Clean up TUI process
tui.close()
```

## Plugin Development

Create plugins to extend OpenCode functionality.

```typescript
// my-plugin.ts
import type { Plugin, PluginInput, Hooks } from "@opencode-ai/plugin"

const myPlugin: Plugin = async (input: PluginInput): Promise<Hooks> => {
  const { client, project, directory } = input

  console.log(`Plugin loaded for project: ${project.id}`)
  console.log(`Working directory: ${directory}`)

  return {
    // Hook into session creation
    async sessionCreated(session, output) {
      console.log(`New session created: ${session.id}`)
    },

    // Hook into message processing
    async messageCreated(message, output) {
      console.log(`Message from ${message.role}: ${message.id}`)
    },

    // Hook into tool execution
    async toolExecuted(tool, output) {
      console.log(`Tool ${tool.name} executed with result: ${tool.result}`)
    },

    // Subscribe to all bus events
    async event({ event }) {
      console.log(`Event: ${event.type}`)
    },

    // Handle configuration changes
    async config(cfg) {
      console.log(`Config updated: ${JSON.stringify(cfg)}`)
    }
  }
}

export default myPlugin
```

Configure the plugin in `opencode.jsonc`:

```jsonc
{
  "plugin": [
    // Local plugin file
    "./my-plugin.ts",
    // NPM package
    "opencode-plugin-example",
    // Plugin with options
    {
      "name": "opencode-plugin-custom",
      "options": {
        "apiKey": "xxx"
      }
    }
  ]
}
```

## Environment Variables

Key environment variables for configuring OpenCode.

```bash
# Server authentication
export OPENCODE_SERVER_PASSWORD="mysecretpassword"
export OPENCODE_SERVER_USERNAME="admin"

# Provider API keys
export ANTHROPIC_API_KEY="sk-ant-xxx"
export OPENAI_API_KEY="sk-xxx"
export GOOGLE_API_KEY="xxx"

# Custom installation directory
export OPENCODE_INSTALL_DIR="/usr/local/bin"

# Data directory (default: ~/.local/share/opencode)
export XDG_DATA_HOME="$HOME/.local/share"

# Config directory (default: ~/.config/opencode)
export XDG_CONFIG_HOME="$HOME/.config"

# Enable auto-sharing of sessions
export OPENCODE_AUTO_SHARE=1

# Run without external plugins
export OPENCODE_PURE=1
```

## Summary

OpenCode serves as a versatile AI coding assistant supporting both interactive terminal sessions and programmatic API access. The primary use cases include interactive code development with AI assistance, automated code review and refactoring pipelines, CI/CD integration for AI-powered code generation, building custom AI coding workflows through the SDK, and extending functionality with MCP servers and plugins.

Integration patterns typically involve either the CLI for interactive development or the JavaScript SDK for building automated tools and custom interfaces. The client/server architecture enables remote development scenarios where OpenCode runs on a development machine while being controlled from a mobile app or web interface. The permission system allows fine-grained control over what operations the AI can perform, making it suitable for enterprise environments with strict security requirements. MCP integration enables connecting to external tools and services, while the plugin system allows customization of the AI's behavior and integration with existing development workflows.