Sage Plugin (OpenCode)

OpenCode plugin for Sage Protocol. Captures prompt/response pairs for RLM feedback and provides inline skill suggestions during coding sessions.

What It Does

• Prompt Capture - Silently records prompt/response pairs with session metadata (model, tokens, cost)
• Inline Suggestions - Debounced skill and prompt suggestions injected into the OpenCode TUI
• RLM Feedback - Tracks whether suggestions were accepted, steered, or rejected within a 30-second correlation window
• Session Tracking - Maintains session and model context across streaming responses

Install

mkdir -p ~/.config/opencode/plugin/@sage-protocol
cp -r sage-plugin ~/.config/opencode/plugin/@sage-protocol/

Add the plugin to your opencode.json:

{
  "plugin": ["@sage-protocol/sage-plugin"],
  "mcp": {
    "sage": {
      "type": "local",
      "command": ["sage", "mcp", "start"],
      "enabled": true
    }
  }
}

Or run sage init --opencode to configure automatically.

Configuration

| Variable | Default | Description | | -------------------------- | ------- | -------------------------------------------- | | SAGE_BIN | sage | Path to the sage binary | | SAGE_SUGGEST_LIMIT | 3 | Max suggestions per request | | SAGE_SUGGEST_DEBOUNCE_MS | 800 | Debounce delay for TUI suggestions | | SAGE_SUGGEST_PROVISION | 1 | Set 0 to skip MCP provisioning | | SAGE_RLM_FEEDBACK | 1 | Set 0 to disable RLM feedback tracking | | SAGE_PLUGIN_DRY_RUN | 0 | Set 1 to disable spawning sage (for tests) |

Notes:

• The plugin passes user prompts via PROMPT and assistant responses via SAGE_RESPONSE when invoking sage capture hook prompt|response.

Requirements

• Sage CLI on PATH (or set SAGE_BIN)
• Bun v1.3+
• OpenCode

Development

bun install
bun run lint
bun test

License

MIT