SDK selection

Reverse API Engineer can drive code generation through Claude, OpenCode, Copilot, or Cursor.

Claude (default)

Direct integration with Anthropic's Claude API. Uses your Anthropic API key. Recommended for most users.

{
  "sdk": "claude",
  "claude_code_model": "claude-sonnet-4-6"
}

OpenCode

Uses the OpenCode SDK running locally. Pick this if you want to route through your own model gateway, run open-weights models, or use a non-Anthropic provider.

{
  "sdk": "opencode",
  "opencode_auto_start": true,
  "opencode_base_url": "http://127.0.0.1:4096",
  "opencode_model": "big-pickle",
  "opencode_npx_package": "opencode-ai@latest",
  "opencode_provider": "opencode"
}

RAE reuses an existing OpenCode server. If none is listening, it downloads and starts the latest opencode-ai release through npx, then stops that child process when RAE exits. A global OpenCode installation is not required. Automatic setup needs Node.js 20+; the first run downloads the OpenCode npm package and later runs use npm's cache. Fresh configurations use the free opencode/big-pickle model by default.

Set opencode_auto_start to false when you manage the server yourself. The environment variables OPENCODE_BASE_URL, RAE_OPENCODE_PACKAGE, and RAE_OPENCODE_AUTO_START override the matching settings. Provider credentials and model identifiers remain OpenCode configuration. Password-protected servers use OPENCODE_SERVER_PASSWORD and optional OPENCODE_SERVER_USERNAME; these variables are inherited by an auto-started server. See OpenCode providers and models.dev.

RAE validates the configured provider/model pair against OpenCode's connected provider catalog before creating a session. Invalid pairs fail immediately and include valid alternatives plus currently exposed free, tool-capable models. Existing compatible servers are reused; versions older than RAE's tested OpenCode release display an upgrade warning.

Ollama through OpenCode

In /settings, set the OpenCode provider to ollama. RAE connects to the configured Ollama daemon (default http://127.0.0.1:11434) and offers the installed models that advertise tool calling and at least 64k context. Picking one updates both opencode_provider and opencode_model.

{
  "sdk": "opencode",
  "opencode_provider": "ollama",
  "opencode_model": "qwen3.5",
  "ollama_auto_start": true,
  "ollama_base_url": "http://127.0.0.1:11434"
}

RAE reuses a running Ollama daemon or starts ollama serve when the CLI is installed. It passes an inline provider definition to an auto-started OpenCode server, so it does not overwrite opencode.json. If you run OpenCode yourself, that existing server must already expose the selected Ollama model; RAE reports the exact remediation when it does not.

Model downloads are intentionally explicit because they can consume many gigabytes: run ollama pull <model> yourself, then select it. Override daemon discovery with RAE_OLLAMA_BASE_URL and disable startup with RAE_OLLAMA_AUTO_START=0. See Ollama's OpenCode integration for the upstream context-window guidance.

Copilot

Uses the GitHub Copilot SDK when the optional Copilot dependency and token are configured.

{
  "sdk": "copilot",
  "copilot_model": "gpt-5"
}

Cursor

Uses the Cursor SDK bridge. Cursor can also load broader Cursor setting layers so WebFetch/WebSearch and configured tools match your desktop setup.

{
  "sdk": "cursor",
  "cursor_model": "composer-2.5",
  "cursor_web_search": true,
  "cursor_setting_sources": null
}

Switching SDKs

In the CLI:

/settings then "SDK"

Or edit ~/.reverse-api/config.json directly.