# opencode-anthropic-proxy

A local proxy server that wraps `claude -p` (Claude Code CLI) to expose an OpenAI-compatible API endpoint for use with OpenCode.

## How it works

OpenCode communicates with AI providers using the OpenAI API format. This proxy listens on `localhost:3000`, receives OpenAI-format requests, translates them into `claude -p` CLI invocations, and returns the responses.

Tool calls (bash, read, write, edit, etc.) are passed through using `--allowedTools` and `--permission-mode bypassPermissions`, allowing Claude to execute tools internally.

## Setup

### 1. Install the systemd user service

```bash
cp claude-proxy.service ~/.config/systemd/user/
systemctl --user daemon-reload
systemctl --user enable --now claude-proxy.service
```

### 2. Configure OpenCode

In your `opencode.json`, add a provider:

```json
"claude-code": {
  "npm": "@ai-sdk/openai-compatible",
  "name": "Claude Code (proxy)",
  "options": {
    "baseURL": "http://localhost:3000/v1"
  },
  "models": {
    "claude-opus-4-7": { "name": "Claude Opus 4.7" },
    "claude-sonnet-4-6": { "name": "Claude Sonnet 4.6" },
    "claude-haiku-4-5": { "name": "Claude Haiku 4.5" }
  }
}
```

### 3. Requirements

- `claude` CLI installed at `~/.local/bin/claude` (Claude Code)
- Node.js 18+

## Notes

- The proxy uses `--permission-mode bypassPermissions` — tools execute without approval prompts
- Model names with provider prefix (e.g., `claude-code/claude-sonnet-4-6`) are handled automatically
- Supports both streaming and non-streaming responses