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docs: update ROADMAP — embed sidecar now In Progress, EPIC #117 with wave sub-issues #118 #119 #120 #121

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four-bytes-robby merged 1 commit into from
Jun 8, 2026
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docs: update ROADMAP — embed sidecar now In Progress, EPIC #117 with wave sub-issues #118 #119 #120 #121

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15 changes: 14 additions & 1 deletion ROADMAP.md
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Expand Up @@ -311,7 +311,20 @@ Per P48 — Open Source Github Review Automation: CI, linters, and tests are alr

## Wave: Embedding Sidecar Architecture

> Status: **Planned**. Replaces node-llama-cpp (in-process) with llama.cpp server as a separate sidecar process.
> Status: **🔄 In Progress** (EPIC #117). Replaces node-llama-cpp (in-process) with a Go sidecar binary that manages `llama-server` as a separate HTTP process. Split into 3 waves:
> - Wave 1 (#118): Go embed-sidecar binary
> - Wave 2 (#119): Plugin integration
> - Wave 3 (#120): Remove node-llama-cpp

### Design Decisions (v1.7.1+)
- **Two modes only**: hash-based (default) / Go sidecar (opt-in via `BRAIN_EMBED_SIDECAR`). No in-process node-llama-cpp.
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- **Non-blocking**: `embed()` returns hash result immediately; sidecar loads async.
- **Go binary**: Bundled via GitHub Releases prebuilt, extracted by `build.ts` (same pattern as `vec0.so`).
- **Self-bootstrapping**: Go binary downloads `llama-server` + GGUF model on first run (cached in `~/.cache/four-opencode-brain/`).
- **Port**: 8666, configurable via `opencode.json` and `BRAIN_EMBED_SIDECAR_PORT`.
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- **Single-instance**: Port bind detection — 2nd instance connects to existing sidecar.
- **Idle timeout**: 30min without requests → auto-shutdown.
- **Rich `/status`**: `{phase, progress, queue_depth}` — always responsive even during model loading.

### Goal
OpenCode communicates with a local llama.cpp server via HTTP (OpenAI-compatible `/v1/embeddings`) instead of embedding node-llama-cpp in the main process. This eliminates init-race conditions, separates CPU-heavy embedding from the main event loop, and allows the sidecar to outlive individual OpenCode sessions.
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