# Task: Add StreamDestination Dataclass
## Context
Add the `StreamDestination` dataclass to define where streaming events go. This works with `StreamConfig` to configure streaming destinations.
## Dependencies
- Must complete: `01-add-stream-config-dataclass.md`
## Files to Modify
- `kiwi_mcp/primitives/http_client.py`
## Implementation Steps
1. Add `Optional` and `Dict` to imports if not already present
2. Add `StreamDestination` dataclass after `StreamConfig`
3. Add fields: `type`, `path`, `config`, `format`
4. Update `StreamConfig.destinations` type hint to use `StreamDestination`
## Code Snippet
From doc lines 285-296:
```python
@dataclass
class StreamDestination:
"""Where streaming events go.
NOTE (A.7): Only 'return' is a built-in http_client sink (buffers in memory).
All other sinks (file_sink, null_sink, websocket_sink) are data-driven tools.
See Appendix A.7 for sink architecture and tool configurations.
"""
type: str # "return" (built-in), or tool-based: "file_sink", "null_sink", "websocket_sink"
path: Optional[str] = None # For file_sink
config: Optional[Dict[str, Any]] = None # For tool-based sinks
format: str = "jsonl" # "jsonl" | "raw"
```
## Success Criteria
- [ ] `StreamDestination` dataclass exists
- [ ] All fields are correctly typed with defaults
- [ ] `StreamConfig.destinations` uses `List[StreamDestination]`
- [ ] Code compiles without errors
## Verification Command
```bash
python -m py_compile kiwi_mcp/primitives/http_client.py
```
## Notes
- The `type` field distinguishes built-in vs data-driven sinks
- `path` is only used by `file_sink`
- `config` is for tool-based sinks (websocket_sink, etc.)
- The docstring explains the architecture clearly
