OpenCode Tailscale Aperture Plugin

Automatically populate models from Tailscale Aperture.

Configuration

Configure the Aperture base URL using one of these methods (in order of precedence):

1. Plugin Options (opencode.json)

{
  "plugins": [
    ["opencode-plugin-tsaperture"]
  ]
}

2. Environment Variable

export APERTURE_BASE_URL="http://ai.my-tailnet.ts.net"

3. Config File (aperture.json)

Create aperture.json in the opencode config directory:

macOS:

~/Library/Application\ Support/opencode/aperture.json

Linux:

~/.config/opencode/aperture.json

Windows:

%APPDATA%\opencode\aperture.json

Contents:

{
  "baseUrl": "http://ai.my-tailnet.ts.net",
  "apiKey": ""
}

apiKey is optional. Set it when your Aperture endpoint requires bearer auth. If omitted, the plugin passes an empty key to the generated providers.

API compatibility

The plugin reads Aperture provider compatibility metadata and registers each provider with the matching OpenCode provider package and endpoint. It supports OpenAI Responses and Chat Completions, Anthropic Messages, Google Vertex, Amazon Bedrock, and Gemini Generate Content routes.

Models.dev enrichment

The plugin enriches Aperture's /v1/models response with the same Models.dev catalog OpenCode uses. When a discovered model matches a catalog provider/model ID, the generated OpenCode config includes the catalog's family, release date, cost, modalities, reasoning/tool/temperature support, interleaved reasoning field, variants, and accurate limit.context, limit.input, and limit.output values.

Important: For full provider-specific feature support, the Aperture provider id and model id should match the Models.dev respective IDs. This lets the plugin select the correct provider-specific model definition when the same model ID exists under multiple Models.dev providers, including provider-specific reasoning effort options.

Optional aperture.json fields:

{
  "modelsDevUrl": "https://models.dev",
  "modelsDevPath": "/path/to/models-dev-api.json",
  "disableModelsDev": false
}

The plugin also honors OpenCode's OPENCODE_MODELS_URL, OPENCODE_MODELS_PATH, and OPENCODE_DISABLE_MODELS_FETCH environment variables.

Usage

Once configured, models will be available via the plugin tools:

• /list_aperture_models - List available models from Aperture
• /get_aperture_model modelId=<id> - Get model details