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CONTRIBUTING.md

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Contributing to OpenCode

We want to make it easy for you to contribute to OpenCode. Here are the most common type of changes that get merged:

  • Bug fixes
  • Additional LSPs / Formatters
  • Improvements to LLM performance
  • Support for new providers
  • Fixes for environment-specific quirks
  • Missing standard behavior
  • Documentation improvements

However, any UI or core product feature must go through a design review with the core team before implementation.

If you are unsure if a PR would be accepted, feel free to ask a maintainer or look for issues with any of the following labels:

[!NOTE] PRs that ignore these guardrails will likely be closed.

Want to take on an issue? Leave a comment and a maintainer may assign it to you unless it is something we are already working on.

Developing OpenCode

  • Requirements: Bun 1.3+

  • Install dependencies and start the dev server from the repo root:

    bun install
bun dev

Running against a different directory

By default, bun dev runs OpenCode in the packages/opencode directory. To run it against a different directory or repository:

bun dev <directory>

To run OpenCode in the root of the opencode repo itself:

bun dev .

Building a "localcode"

To compile a standalone executable:

./packages/opencode/script/build.ts --single

Then run it with:

./packages/opencode/dist/opencode-<platform>/bin/opencode

Replace <platform> with your platform (e.g., darwin-arm64, linux-x64).

  • Core pieces:
    • packages/opencode: OpenCode core business logic & server.
    • packages/opencode/src/cli/cmd/tui/: The TUI code, written in SolidJS with opentui
    • packages/app: The shared web UI components, written in SolidJS
    • packages/desktop: The native desktop app, built with Tauri (wraps packages/app)
    • packages/plugin: Source for @opencode-ai/plugin

Understanding bun dev vs opencode

During development, bun dev is the local equivalent of the built opencode command. Both run the same CLI interface:

# Development (from project root)
bun dev --help           # Show all available commands
bun dev serve            # Start headless API server
bun dev web              # Start server + open web interface
bun dev <directory>      # Start TUI in specific directory

# Production
opencode --help          # Show all available commands
opencode serve           # Start headless API server
opencode web             # Start server + open web interface
opencode <directory>     # Start TUI in specific directory

Running the API Server

To start the OpenCode headless API server:

bun dev serve

This starts the headless server on port 4096 by default. You can specify a different port:

bun dev serve --port 8080

Running the Web App

To test UI changes during development:

  1. First, start the OpenCode server (see Running the API Server section above)

  2. Then run the web app:

    bun run --cwd packages/app dev

This starts a local dev server at http://localhost:5173 (or similar port shown in output). Most UI changes can be tested here, but the server must be running for full functionality.

Running the Desktop App

The desktop app is a native Tauri application that wraps the web UI.

To run the native desktop app:

bun run --cwd packages/desktop tauri dev

This starts the web dev server on http://localhost:1420 and opens the native window.

If you only want the web dev server (no native shell):

bun run --cwd packages/desktop dev

To create a production dist/ and build the native app bundle:

bun run --cwd packages/desktop tauri build

This runs bun run --cwd packages/desktop build automatically via Tauri’s beforeBuildCommand.

[!NOTE] Running the desktop app requires additional Tauri dependencies (Rust toolchain, platform-specific libraries). See the Tauri prerequisites for setup instructions.

[!NOTE] If you make changes to the API or SDK (e.g. packages/opencode/src/server/server.ts), run ./script/generate.ts to regenerate the SDK and related files.

Please try to follow the style guide

Setting up a Debugger

Bun debugging is currently rough around the edges. We hope this guide helps you get set up and avoid some pain points.

The most reliable way to debug OpenCode is to run it manually in a terminal via bun run --inspect=<url> dev ... and attach your debugger via that URL. Other methods can result in breakpoints being mapped incorrectly, at least in VSCode (YMMV).

Caveats:

  • If you want to run the OpenCode TUI and have breakpoints triggered in the server code, you might need to run bun dev spawn instead of the usual bun dev. This is because bun dev runs the server in a worker thread and breakpoints might not work there.
  • If spawn does not work for you, you can debug the server separately:
    • Debug server: bun run --inspect=ws://localhost:6499/ --cwd packages/opencode ./src/index.ts serve --port 4096, then attach TUI with opencode attach http://localhost:4096
    • Debug TUI: bun run --inspect=ws://localhost:6499/ --cwd packages/opencode --conditions=browser ./src/index.ts

Other tips and tricks:

  • You might want to use --inspect-wait or --inspect-brk instead of --inspect, depending on your workflow
  • Specifying --inspect=ws://localhost:6499/ on every invocation can be tiresome, you may want to export BUN_OPTIONS=--inspect=ws://localhost:6499/ instead

VSCode Setup

If you use VSCode, you can use our example configurations .vscode/settings.example.json and .vscode/launch.example.json.

Some debug methods that can be problematic:

  • Debug configurations with "request": "launch" can have breakpoints incorrectly mapped and thus unusable
  • The same problem arises when running OpenCode in the VSCode JavaScript Debug Terminal

With that said, you may want to try these methods, as they might work for you.

Pull Request Expectations

Issue First Policy

All PRs must reference an existing issue. Before opening a PR, open an issue describing the bug or feature. This helps maintainers triage and prevents duplicate work. PRs without a linked issue may be closed without review.

  • Use Fixes #123 or Closes #123 in your PR description to link the issue
  • For small fixes, a brief issue is fine - just enough context for maintainers to understand the problem

General Requirements

  • Keep pull requests small and focused
  • Explain the issue and why your change fixes it
  • Before adding new functionality, ensure it doesn't already exist elsewhere in the codebase

UI Changes

If your PR includes UI changes, please include screenshots or videos showing the before and after. This helps maintainers review faster and gives you quicker feedback.

Logic Changes

For non-UI changes (bug fixes, new features, refactors), explain how you verified it works:

  • What did you test?
  • How can a reviewer reproduce/confirm the fix?

No AI-Generated Walls of Text

Long, AI-generated PR descriptions and issues are not acceptable and may be ignored. Respect the maintainers' time:

  • Write short, focused descriptions
  • Explain what changed and why in your own words
  • If you can't explain it briefly, your PR might be too large

PR Titles

PR titles should follow conventional commit standards:

  • feat: new feature or functionality
  • fix: bug fix
  • docs: documentation or README changes
  • chore: maintenance tasks, dependency updates, etc.
  • refactor: code refactoring without changing behavior
  • test: adding or updating tests

You can optionally include a scope to indicate which package is affected:

  • feat(app): feature in the app package
  • fix(desktop): bug fix in the desktop package
  • chore(opencode): maintenance in the opencode package

Examples:

  • docs: update contributing guidelines
  • fix: resolve crash on startup
  • feat: add dark mode support
  • feat(app): add dark mode support
  • fix(desktop): resolve crash on startup
  • chore: bump dependency versions

Style Preferences

These are not strictly enforced, they are just general guidelines:

  • Functions: Keep logic within a single function unless breaking it out adds clear reuse or composition benefits.
  • Destructuring: Do not do unnecessary destructuring of variables.
  • Control flow: Avoid else statements.
  • Error handling: Prefer .catch(...) instead of try/catch when possible.
  • Types: Reach for precise types and avoid any.
  • Variables: Stick to immutable patterns and avoid let.
  • Naming: Choose concise single-word identifiers when they remain descriptive.
  • Runtime APIs: Use Bun helpers such as Bun.file() when they fit the use case.

Feature Requests

For net-new functionality, start with a design conversation. Open an issue describing the problem, your proposed approach (optional), and why it belongs in OpenCode. The core team will help decide whether it should move forward; please wait for that approval instead of opening a feature PR directly.