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headquarter/openspec/changes/runfusion-poc/design.md
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docs(openspec): add OpenSpec changes for FN-005, FN-006, FN-008, FN-009, FN-010
- Add frontend-foundation change (FN-005) with 46 tasks
- Add deployment-config change (FN-006) with 27 tasks
- Add runfusion-poc/opencode-poc change (FN-008) with 25 tasks
- Add config-secrets change (FN-009) with 31 tasks
- Add codeserver-spawn change (FN-010) with 38 tasks
- Include project specsheet and configuration
- Archive completed deployment-config change
2026-05-14 17:35:20 +02:00

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## Context
OpenCode is an AI-powered terminal-based development environment with a web interface. Unlike code-server which is a full web IDE, OpenCode provides a terminal experience accessible through the browser. This POC validates that the spawn system handles different runtime types including web terminal forwarding.
Current state:
- OpenCode manifest exists in apps/api/app/tools/manifests/opencode.yml
- No container image or runtime defined yet
- No health reporting mechanism
- Spawn infrastructure will be built in FN-010
## Goals / Non-Goals
**Goals:**
- Define OpenCode as a spawnable tool
- Provide web terminal interface in container
- Report health status (running/idle/error)
- Support interactive terminal sessions
**Non-Goals:**
- Full task queue or job scheduler
- Persistent process management
- Log streaming (deferred)
- Multi-language support beyond terminal
## Decisions
**1. Use official OpenCode Docker image**
- Rationale: Maintained, includes AI features and web terminal
- Alternative: Custom image - unnecessary for POC
**2. OpenCode runs as a persistent container**
- Rationale: Easier to manage lifecycle (start/stop/status). Terminal sessions need persistent container.
- Implementation: Container runs OpenCode with web interface on port 3000
**3. Health check via HTTP endpoint**
- Rationale: Standard Docker health check mechanism. Traefik can use it.
- Endpoint: `GET /` returns 200 when ready
**4. Workspace mounted from host (same as code-server)**
- Rationale: Consistency. Shared workspace between tools.
- Path: `/data/workspaces/{user_slug}/{project_slug}`
**5. Configs/secrets injected same as code-server**
- Rationale: Reuse FN-009 infrastructure. No special handling needed.
## Risks / Trade-offs
**[Risk] OpenCode container requires significant resources**
→ Mitigation: Set resource limits (4GB RAM, 2 CPU). Document requirements.
**[Risk] Web terminal performance over slow connections**
→ Mitigation: Use modern terminal emulation with compression. Document bandwidth requirements.
**[Risk] AI features require API keys**
→ Mitigation: Support secret injection for API keys. Document configuration.
## Migration Plan
No migration. New feature.
## Open Questions
1. Should OpenCode support multiple terminal sessions?
2. Do we pre-configure common development tools?
3. Should OpenCode integrate with the platform's AI provider?